Casino Glossary

A blackjack variant that pays 6:5 instead of the standard 3:2 for a natural blackjack. This single rule change increases the house edge by about 1.4%. Always avoid 6:5 tables because they are significantly worse for players.

Another name for a parlay, common in European sports betting. Combines multiple selections into one bet where all must win. Accumulators are popular for their large potential payouts but carry very high house edge due to compounding margins.

The total amount of money wagered over a period of time. A player who bets $25 per hand for 100 hands has $2,500 in action. Casinos use total action to calculate comps and player value.

A record or bet type referring to performance relative to the point spread. A team that is 8-4 ATS has covered the spread 8 times in 12 games. ATS records are a key metric for sports bettors.

Betting all of your remaining chips in a single wager. In no-limit poker, any player can go all-in at any time. If you can't match a bet, you go all-in for what you have and are only eligible for the portion of the pot you've contributed to.

A roulette variant with 38 numbers (0, 00, 1-36) and a house edge of 5.26%. The extra double-zero pocket nearly doubles the house edge compared to European roulette. Mathematically inferior for the player.

A forced bet placed by all players before a poker hand begins. Unlike blinds, antes are placed by every player at the table. Used in tournaments to increase action as blinds rise.

A one-roll craps bet that the next roll will be a 7. Pays 4:1 but the true odds are 5:1, giving it a massive house edge of 16.67%, one of the worst bets in the entire casino.

Exploiting differing odds across multiple bookmakers to guarantee a profit regardless of the outcome. For example, if one book has Team A at +110 and another has Team B at +110, betting both guarantees a small profit. Books quickly correct arbitrage opportunities.

A handicap betting system originating in Asia that eliminates the draw by using half-point and quarter-point lines. A -0.25 handicap splits the bet: half on 0 (draw no bet) and half on -0.5. Reduces bookmaker margins.

A slot feature that automatically spins the reels a set number of times at the current bet level. Useful for clearing wagering requirements but dangerous for responsible gambling because it removes the natural pauses between bets.

The 5% fee charged on winning banker bets in traditional baccarat. Despite this commission, the banker bet (1.06% house edge) remains better than the player bet (1.24%). Commission-free variants exist but adjust payouts instead.

Electronic displays showing the history of recent hands in baccarat (bead road, big road, big eye boy, small road, cockroach pig). Used by players to spot patterns, though each hand is mathematically independent.

A card counting technique where the player stands behind the table counting cards without betting, then sits down and bets only when the count is favorable. Named after Stanford Wong. Casinos combat this with 'no mid-shoe entry' rules.

Losing a hand despite being a heavy statistical favorite. For example, having pocket Aces cracked by a runner-runner flush. Bad beats are a normal part of poker variance, but they often trigger tilt.

A bet on the banker hand in baccarat. Has a house edge of 1.06% (after the 5% commission on wins). The best bet in baccarat despite the commission. The banker hand wins slightly more often due to third-card rules.

The total amount of money a player has set aside specifically for gambling. Proper bankroll management (deciding how much to risk per session or bet) is crucial for longevity at the casino.

The strategy of controlling how much you bet relative to your total gambling funds. Good bankroll management typically means never risking more than 1-5% of your total bankroll on a single bet or session.

The mathematically optimal play for every possible hand combination in blackjack, determined by computer simulation. Following basic strategy reduces the house edge to approximately 0.5%. It covers when to hit, stand, double, split, and surrender.

A button that automatically sets the maximum possible bet on a slot machine. Some progressive jackpots require max bet to be eligible. Always check the rules before playing, as max bet can be very expensive per spin.

A roulette wheel with physical imperfections causing certain numbers to hit more frequently than expected. Historically, players like Joseph Jagger and Gonzalo García-Pelayo exploited biased wheels. Modern casinos regularly test and replace wheels.

A two-card hand consisting of an Ace and a 10-value card (10, J, Q, K), totaling 21. A natural blackjack typically pays 3:2 (some tables pay 6:5, which significantly increases the house edge). Beats all other hands except another blackjack.

A forced bet in poker, placed before cards are dealt. The small blind is usually half the big blind. Blinds ensure action in every hand and rotate clockwise each deal.

Betting or raising with a weak hand to make opponents fold better hands. Successful bluffing depends on table image, opponent tendencies, board texture, and bet sizing. Over-bluffing is a common amateur mistake.

An option to pay a premium (typically 50-100x the bet) to instantly trigger a slot's bonus round instead of waiting for scatter symbols. Banned in some jurisdictions (UK). The cost is calibrated to maintain the slot's RTP.

A special feature in slot machines triggered by specific symbol combinations (usually 3+ scatter symbols). Bonus rounds can include free spins, pick-and-win games, wheel spins, or cascading multipliers. Often where the biggest slot wins occur.

Rolling a total of 12 (two sixes) in craps. Also called 'midnight.' Same probability as snake eyes: 1/36 (2.78%). As a proposition bet, pays 30:1 against true odds of 35:1.

When a hand's total exceeds 21 in blackjack, resulting in an automatic loss. The dealer must hit until reaching 17+, so the dealer can also bust. The house edge partly comes from the fact that if both player and dealer bust, the player still loses.

A disc that rotates clockwise each hand to indicate the nominal dealer position. The player on the button acts last post-flop, making it the most advantageous position in poker. Also called 'being on the button.'

A craps bet similar to a place bet but paying at true odds minus a 5% commission. Buy bets are better than place bets on 4 and 10 (reduced house edge from 6.67% to 4.76%) but worse on 6 and 8.

The amount of money a player exchanges for chips at a table game or the entry fee for a poker tournament. Minimum buy-ins vary by table, typically 20-50 times the minimum bet for cash games.

The cashier area in a casino where players exchange chips for cash, cash checks, and handle financial transactions. Also called the casino cage or cashier's cage.

A player who calls too frequently and rarely folds or raises. Calling stations are profitable opponents because they pay off value bets, but bluffing them is futile. Adjust by betting your strong hands and not bluffing.

A technique used in blackjack to track the ratio of high to low cards remaining in the deck. When the count is favorable (many high cards left), the player increases bets. Not illegal but casinos can ban counters. The Hi-Lo system is the most popular method.

A slot mechanic where winning symbols disappear and new ones fall from above to fill the gaps, potentially creating chain reactions of wins from a single spin. Also called tumbling reels, avalanche, or collapsing reels.

A casino promotion that returns a percentage of net losses to the player, typically 5-15%. Cashback reduces the effective house edge. Some VIP programs offer daily or weekly cashback based on total wagered rather than losses.

The process of converting chips back to cash or withdrawing winnings from an online casino account. Withdrawal times vary: crypto is fastest (minutes to hours), e-wallets take hours to days, and bank transfers take 3-7 business days.

A promotional offer from a casino that gives players extra money or free spins. Types include welcome bonuses, no-deposit bonuses, reload bonuses, and free spins. Always subject to wagering requirements and terms.

The dangerous behavior of increasing bets after losing in an attempt to recover money. This is one of the most common signs of problem gambling and almost always leads to larger losses. Set a loss limit before playing and stick to it.

To check initially and then raise after an opponent bets in the same round. A powerful play that can be used for value (with strong hands) or as a bluff. Considered an aggressive and deceptive move.

An older version of baccarat where players take turns being the banker and can choose whether to draw a third card. Popular in Europe, especially France. More strategic than punto banco but rarely found in modern casinos.

The final odds or line available just before a game starts. Consistently beating the closing line is the strongest indicator of a profitable sports bettor. Sharp money moves the line toward its efficient closing value.

An extended period of losing. Cold streaks are a normal part of gambling variance and do not mean the game is 'rigged' or that a hot streak is 'due.' Managing cold streaks without chasing losses is essential for bankroll preservation.

Exchanging smaller denomination chips for larger ones when leaving a table. For example, trading twenty $5 chips for one $100 chip. Dealers will ask 'color up?' when you prepare to leave.

A roulette bet covering an entire column of 12 numbers on the layout. Pays 2:1. There are three columns, each containing 12 numbers. Zero(s) are not included in any column.

The branch of mathematics dealing with counting combinations and permutations. In poker, combinatorics determines how many ways a hand can be dealt. For example, there are 1,326 possible two-card starting hands in Texas Hold'em.

A craps bet that works like a pass line bet but can be made after the come-out roll. Establishes its own point number. House edge of 1.41%. Can be backed with odds for a combined lower edge.

The first roll of a new round in craps. On the come-out, pass line bets win on 7 or 11 (natural) and lose on 2, 3, or 12 (craps). Any other number (4, 5, 6, 8, 9, 10) becomes the point.

Shared cards dealt face-up in the center of the table that all players use to make their hands. In Texas Hold'em, five community cards are dealt in three stages: flop (3), turn (1), and river (1).

Short for complimentary. Free items or services given by casinos to gamblers. Includes free meals, hotel rooms, show tickets, and cash back. Value is typically 0.1-0.3% of total money wagered.

A bet made on the flop by the pre-flop raiser, regardless of whether the flop helped their hand. C-bets exploit the fact that the flop misses most hands. Standard c-bet sizing is 50-75% of the pot.

A roulette bet covering four numbers that share a common corner on the layout. Placed at the intersection of four numbers. Pays 8:1. Also called a square bet or quad bet.

A device that continuously shuffles cards, making card counting impossible. After each hand, discards are fed back into the machine. CSMs slightly reduce the house edge for basic strategy players but eliminate any counting advantage.

A colored plastic card inserted into a shoe to mark where the dealer will stop dealing and reshuffle. The position of the cut card determines deck penetration, which is crucial for card counters.

A betting system where you increase your bet by one unit after a loss and decrease by one unit after a win. More conservative than Martingale, but like all negative expectation systems, it cannot overcome the house edge long-term.

The percentage of cards dealt before reshuffling. Deep penetration (75%+) is better for card counters because it provides more information. Casinos reduce penetration to combat counting.

Events where the outcome of one affects the probability of subsequent events. Drawing cards from a deck is a dependent event: as cards are removed, the probabilities of remaining cards change. This is why card counting works in blackjack.

Money added to an online casino account. Most casinos require a minimum deposit ($10-$25). Common methods include credit cards, e-wallets (Skrill, Neteller), bank transfers, and cryptocurrency.

A self-imposed cap on how much money you can deposit into an online casino account within a set timeframe (daily, weekly, or monthly). An important responsible gambling tool available at licensed online casinos.

The opposite of the pass line in craps. Wins on 2 or 3, pushes on 12, loses on 7 or 11 on the come-out roll. After a point is established, wins if 7 comes before the point. House edge of 1.36%.

A blackjack option where you double your initial bet and receive exactly one more card. Optimal when you have a strong starting hand (like 11) against a weak dealer upcard. Basic strategy specifies exactly when to double.

The extra green pocket found only on American roulette wheels, numbered 00. It nearly doubles the house edge compared to European roulette (5.26% vs 2.7%). Offers no benefit to players, so always choose single-zero wheels.

A roulette bet covering 12 consecutive numbers: 1st dozen (1-12), 2nd dozen (13-24), or 3rd dozen (25-36). Pays 2:1. Similar to a column bet but groups numbers sequentially rather than by column.

A popular baccarat side bet that pays based on the winning margin (how many points the winning hand beats the losing hand by). Natural winners pay 1:1; a 9-point margin pays 30:1. House edge is approximately 2.65%.

A sports bet common in horse racing and golf that consists of two equal bets: one on the selection to win and one to place (finish in the top 2-4). If the selection wins, both bets pay. If it places but doesn't win, only the place bet pays.

Surrender option available before the dealer checks for blackjack. Much more valuable than late surrender and reduces the house edge by about 0.6%. Extremely rare in modern casinos because of how advantageous it is for players.

The mathematical advantage expressed as a percentage. A player edge means positive expected value; a house edge means negative expected value. Even a small edge (1-2%) becomes significant over thousands of bets.

A technique that exploits tiny manufacturing imperfections on the backs of playing cards to identify high or low cards. Made famous by Phil Ivey. Casinos consider it cheating; courts have ruled differently in various jurisdictions.

A European roulette rule where even-money bets (red/black, odd/even, high/low) are 'imprisoned' when the ball lands on zero. If the next spin wins, the bet is returned without profit. Reduces the house edge from 2.7% to 1.35%.

Your share of the pot based on the probability of winning the hand. If you have a 40% chance of winning a $200 pot, your equity is $80. Equity changes with each new card dealt.

A roulette variant with 37 numbers (0-36) and a house edge of 2.7%. Has a single zero pocket, unlike American roulette which has two. Always choose European over American roulette for better odds.

An option offered when you have blackjack and the dealer shows an Ace. Taking even money guarantees a 1:1 payout instead of risking a push if the dealer also has blackjack. Mathematically equivalent to taking insurance and is generally a bad bet.

A wild symbol that expands to cover an entire reel when it lands. Expanding wilds can create multiple winning combinations simultaneously. Most commonly triggered during free spins or bonus rounds.

An advanced soccer statistic measuring the quality of scoring chances. Each shot is assigned a probability of becoming a goal based on historical data. xG helps identify underperforming or overperforming teams for betting value.

The average amount a player can expect to win or lose per bet over the long run. Calculated as (probability of winning × win amount) - (probability of losing × loss amount). A positive EV means the bet is profitable long-term; negative EV means it loses money.

A betting system based on the Fibonacci sequence (1, 1, 2, 3, 5, 8, 13...). After a loss, move to the next number; after a win, move back two numbers. Less aggressive than Martingale but equally unable to beat the house edge.

A one-roll craps bet that wins if 2, 3, 4, 9, 10, 11, or 12 is rolled. Typically pays even money, with 2:1 on 2 and 12 (some casinos pay 3:1 on 12). House edge is 2.78-5.56% depending on payouts.

The seat to the dealer's immediate left in blackjack, receiving cards first. No mathematical advantage or disadvantage to seating position. Some card counters prefer third base to see more cards before acting.

A weak or inexperienced poker player who makes consistent strategic errors. Fish are the primary source of profit in poker. The saying goes: 'If you can't spot the fish at the table, you're the fish.'

A betting strategy where you wager the same amount on every bet. The simplest and most bankroll-friendly approach. Unlike progressive systems (Martingale, Fibonacci), flat betting doesn't amplify losses during cold streaks.

The first three community cards dealt face-up simultaneously in Texas Hold'em and Omaha. The flop dramatically changes hand equities and is where the most critical post-flop decisions are made.

To discard your hand and forfeit any bets already placed in the current round. Folding is free (costs nothing beyond what you've already bet). Knowing when to fold is one of the most important skills in poker.

Bonus slot spins that don't cost the player anything. Often awarded as part of a welcome bonus or promotion. Winnings from free spins usually come with wagering requirements.

A roulette variant with the same single-zero wheel as European roulette but featuring the la partage or en prison rules on even-money bets. Offers the lowest house edge in roulette at 1.35% on even-money wagers.

A wager on an event that will be decided in the future, like betting on a team to win the championship before the season starts. Futures typically offer higher payouts but tie up your money for longer. The house edge on futures is often very high (15-40%).

An optional feature in some slots that lets you risk your winnings on a double-or-nothing bet (usually guessing a card color or suit). The house edge on gamble features is typically 0% (fair coin flip) but with high variance.

The mistaken belief that past random events affect future outcomes. For example, thinking that after 10 red results in roulette, black is 'due.' Each spin is independent and the wheel has no memory. One of the most common cognitive biases in gambling.

The percentage of bets on a specific game that count toward clearing a bonus wagering requirement. Slots typically count 100%, while blackjack may count only 10-20%. Always check game weighting before attempting to clear a bonus.

A playing style focused on making small, consistent profits over long sessions with low-risk bets. Grinders prioritize bankroll preservation over big wins. Common in poker and low-edge table games like blackjack.

A straight draw missing one card in the middle. For example, holding 5-7 with a board of 8-9-K, and only a 6 completes the straight. Only 4 outs, making it half as likely to hit as an open-ended straight draw.

Giving one team a virtual advantage or disadvantage to level the playing field. European handicap uses whole numbers (draws possible). Asian handicap uses half and quarter lines to eliminate draws. Popular in soccer betting.

A blackjack hand without an Ace, or where the Ace must count as 1 to avoid busting. For example, 10-7 is a hard 17, and A-6-10 is also hard 17 (Ace counts as 1). Hard hands are riskier to hit.

A craps bet that a specific even number (4, 6, 8, or 10) will be rolled as a pair before it's rolled any other way or before a 7. For example, hard 8 is 4-4. High house edges: 9.09% (hard 6/8) and 11.11% (hard 4/10).

A poker game or hand played between only two players. Heads-up play requires a different strategy than full-ring games: you must play more hands, bluff more frequently, and adjust to your opponent's tendencies.

Placing a bet on the opposite outcome of an existing wager to guarantee a profit or minimize loss. Common with parlays or futures when you've already won several legs. Hedging sacrifices maximum profit for reduced risk.

A player who consistently gambles with large amounts of money. Also called a 'whale.' High rollers receive VIP treatment including personal hosts, comp suites, higher table limits, and favorable terms.

To request an additional card in blackjack. Basic strategy dictates when to hit based on your hand total and the dealer's upcard. Generally, hit on hard totals of 11 or less, and on 12-16 when the dealer shows 7 or higher.

How often a slot machine produces a winning combination, expressed as a percentage. A 30% hit frequency means roughly 1 in 3 spins produces some kind of win. Low hit frequency slots have fewer but larger wins; high hit frequency means frequent small payouts.

A slot bonus feature where triggering symbols lock in place while remaining positions respin a set number of times. New matching symbols also lock and reset the respin counter. Popularized by the Lightning Link series.

The dealer's face-down card in blackjack. In American blackjack, the dealer checks the hole card for blackjack when showing an Ace or 10. In European style, the hole card isn't dealt until players complete their hands.

A one-roll craps bet on a specific dice combination. For example, hopping 3-5 bets that the next roll shows exactly a 3 and a 5. Pays 15:1 for non-pairs and 30:1 for pairs. High house edge; for entertainment only.

An extended period of winning. Due to the gambler's fallacy, players often believe hot streaks will continue, but each event remains independent. The best strategy during a hot streak is to lock in profits, not increase bet sizes.

Another term for house edge. The built-in mathematical advantage that ensures casinos profit over time. Every casino game has a house advantage, ranging from under 0.5% (blackjack with basic strategy) to over 25% (some keno bets).

The mathematical advantage the casino has over the player, expressed as a percentage of each bet that the casino expects to keep over the long run. For example, a 2% house edge means the casino expects to keep $2 for every $100 wagered. Different games and bets within games have different house edges.

The specific rules set by a particular casino that may differ from standard rules. House rules in blackjack (such as dealer hits soft 17, number of decks, doubling restrictions) significantly affect the house edge.

Pot odds adjusted for expected future betting. If your hand could win a large pot on future streets, the implied odds may justify calling even when current pot odds are unfavorable. Key concept in no-limit hold'em.

Placing bets while a game is in progress, with odds updating in real-time based on what's happening. In-play markets offer opportunities but also higher vig and the risk of impulsive betting. Requires quick analysis.

Events where the outcome of one does not affect the outcome of another. Each roulette spin and each dice roll is independent. Cards drawn from a deck are NOT independent because removing a card changes the deck composition.

A roulette bet placed on specific numbers or small groups of numbers on the inner part of the table layout. Inside bets include straight-up, split, street, corner, and six-line bets. Higher risk with higher payouts.

A side bet offered when the dealer shows an Ace, paying 2:1 if the dealer has blackjack. The house edge on insurance is approximately 7.4%, making it one of the worst bets in blackjack. Card counters may take insurance when the count is high.

The commission charged by sportsbooks on losing bets. Standard juice is 10% (implied by the -110 line). A $110 bet at -110 wins $100 or loses $110. The juice ensures the book profits regardless of the outcome.

A mathematical formula that calculates the optimal bet size to maximize long-term bankroll growth. The formula is f* = (bp - q) / b, where b = net odds, p = win probability, q = loss probability. Most professionals use fractional Kelly (half or quarter).

Identity verification required by online casinos before processing withdrawals. Players must submit ID documents, proof of address, and sometimes payment method verification. Required by gambling regulations to prevent fraud and money laundering.

A French roulette rule where half of even-money bets are returned when the ball lands on zero. Reduces the house edge from 2.7% to 1.35% on even-money bets. Similar to en prison but simpler: you get half back immediately.

Surrender option available after the dealer checks for blackjack. You forfeit half your bet instead of playing the hand. Most valuable on hard 16 vs dealer 9, 10, or Ace. Reduces the house edge by about 0.08%.

A mathematical theorem stating that as the number of trials increases, actual results converge toward the expected value. This is why casinos always profit long-term because they play enough hands for the house edge to reliably manifest.

A craps bet that 7 will be rolled before a specific point number. The opposite of a buy bet. The casino charges a 5% commission on winning lay bets. Used by don't pass bettors who want action on specific numbers.

Changes in odds or point spreads between opening and closing. Lines move due to sharp action (professional bets), public betting patterns, injuries, weather, and other information. Tracking line movement reveals where smart money is going.

Online casino games streamed in real-time from a studio with a human dealer. Combines the convenience of online play with the authenticity of a physical casino. Popular games include live blackjack, roulette, and baccarat.

A betting system where you double your bet after every loss. Mathematically proven to not overcome the house edge. Produces frequent small wins but occasional catastrophic losses. Table limits prevent infinite doubling.

The maximum possible payout on a single spin of a slot, typically expressed as a multiplier of the bet (e.g., 5,000x, 10,000x). Some slots cap wins at a fixed maximum. Check max win before playing, as it affects long-term return.

The highest amount a casino allows on a single wager. Table limits are posted at each game. Max bets exist to limit casino exposure and prevent betting systems like the Martingale from being effective.

A cap on how much you can withdraw from winnings generated by a bonus. For example, a no-deposit bonus might have a $100 max cashout, so even if you win $500, you can only withdraw $100. Common with free bonuses.

A slot mechanic by Big Time Gaming offering a variable number of symbols per reel each spin, creating up to 117,649 or more ways to win. The number of ways changes every spin. Megaways slots are typically high variance.

Betting both sides of a line that has moved, creating a window where both bets can win. For example, betting Team A -3 early and Team B +5 later. If Team A wins by 4, both bets win. Low risk but requires tracking line movement.

A smaller, faster version of baccarat played at a standard-sized table with one dealer. Same rules and odds as big baccarat. Lower minimums make it more accessible. The most common version found in casinos today.

The lowest amount allowed on a single wager at a casino game. Minimum bets vary by table and time of day. Busier times and better games often have higher minimums. Online casinos typically offer lower minimums than live casinos.

A bet on which team or player will win a game outright. Expressed as positive or negative numbers: -150 means you must bet $150 to win $100 (favorite); +150 means a $100 bet wins $150 (underdog). No point spread involved.

A feature that multiplies winnings by a specified amount. Multipliers can appear in base games, free spins, or bonus rounds. Common multipliers range from 2x to 10x, with some slots offering progressive multipliers up to 100x or more.

A two-card hand totaling 8 or 9 in baccarat. When either the player or banker has a natural, no more cards are drawn. A natural 9 beats a natural 8. Naturals end the hand immediately.

A roulette bet covering a number and its neighbors on the physical wheel (not the table layout). For example, a neighbours bet on 17 covers 17 and the two numbers on each side of it on the wheel. Common in European and French roulette.

A casino bonus awarded without requiring a deposit. Usually small ($5-$25 or 10-50 free spins). Allows players to try a casino risk-free. Comes with strict wagering requirements and maximum cashout limits.

A bell-shaped probability distribution where most results cluster around the average. In gambling, short-term results follow a normal distribution around the expected value, with the spread determined by standard deviation.

The best possible hand given the community cards on the board. For example, if the board shows A-K-Q-J-2 with no flush possible, a player holding 10-x has the nut straight. Having the nuts means you cannot lose.

An additional bet placed behind the pass line after a point is established. The only bet in the casino with ZERO house edge, paying at true odds. Casinos limit odds bets (commonly 3x-4x-5x). Always take maximum odds.

Cards remaining in the deck that will improve your hand to a likely winner. A flush draw has 9 outs; an open-ended straight draw has 8 outs. The Rule of 2 and 4: multiply outs by 2 (one card) or 4 (two cards) for approximate equity percentage.

A roulette bet placed on larger groupings of numbers on the outer part of the table layout. Includes red/black, odd/even, high/low, dozens, and columns. Lower payouts but higher probability of winning.

A bet on whether the combined score of both teams will be over or under a number set by the bookmaker. For example, an over/under of 47.5 in football, where you bet whether the total will be 48+ or 47 or fewer.

A card in your hand that is higher than any card on the board. For example, holding AK on a 9-7-3 flop gives you two overcards. Overcards have some value (6 outs to make top pair) but are not yet a made hand.

A single bet combining multiple selections, and all must win for the parlay to pay out. Payouts multiply with each leg added. A 4-team parlay at -110 each pays about 12:1. High reward but very low probability. The house edge compounds with each leg.

The most fundamental bet in craps, placed before the come-out roll. Wins on 7 or 11, loses on 2, 3, or 12. Any other number becomes the point. Has a house edge of 1.41%, making it one of the best bets in the casino.

The information screen showing all symbol values, winning combinations, special features, and rules for a specific slot machine. Always check the pay table before playing to understand what each symbol pays and how bonus features trigger.

A line across the reels of a slot machine that determines winning combinations. Modern video slots can have 1 to hundreds of paylines. More paylines increase the chance of winning per spin but also increase the cost per spin.

The amount of money paid to a winning player. Payouts are expressed as ratios (3:2, 2:1) or multipliers (35x). The difference between true odds and payout odds is where the house edge comes from.

A casino employee who supervises table games in a designated area (pit). Pit bosses monitor dealers, resolve disputes, watch for advantage players, authorize comps, and ensure game integrity.

A craps bet that a specific number (4, 5, 6, 8, 9, or 10) will be rolled before 7. Place bets on 6 and 8 have a low 1.52% house edge. Place bets on 4 and 10 have a higher 6.67% house edge.

A bet on the player hand in baccarat. Has a house edge of 1.24% with no commission on wins. Slightly worse odds than the banker bet, but no commission makes payouts simpler.

The number established on the come-out roll (4, 5, 6, 8, 9, or 10). Once set, the shooter must roll the point again before rolling a 7 to win the pass line bet. The probability varies: 6 and 8 are easiest; 4 and 10 are hardest.

A handicap set by bookmakers to create a balanced betting market. The favorite must win by more than the spread to cover. For example, Team A -6.5 means they must win by 7+ points. Standard juice is -110 on both sides.

Your seat relative to the dealer button. Late position (button, cutoff) is advantageous because you act after opponents, gaining information. Early position requires stronger hands because more players act after you.

A situation where you have already invested so much of your stack in the pot that folding would be mathematically incorrect. As a rule of thumb, if you've committed more than one-third of your stack, you're often pot committed.

In poker, the ratio between the current pot size and the cost of a call. If the pot is $100 and you must call $20, your pot odds are 5:1. Compare pot odds to your hand's equity to make mathematically correct decisions.

The likelihood of a specific outcome occurring, expressed as a number between 0 and 1 (or 0% and 100%). In a fair coin flip, the probability of heads is 0.5. Understanding probability is fundamental to evaluating any casino bet.

A jackpot that increases each time the game is played without being won. A small percentage of each bet contributes to the jackpot pool. Can reach millions of dollars. Usually has a very high house edge on the base game.

A bet on a specific event within a game that doesn't necessarily relate to the final outcome. Examples: total passing yards, first team to score, number of corners in a soccer match. Props often have higher house edges than main markets.

One-roll craps bets placed on specific outcomes like any 7, any craps, or specific number combinations. Proposition bets have the highest house edges in craps (5.56-16.67%). Experienced players avoid them entirely.

The most common form of baccarat played in casinos worldwide. 'Punto' means player, 'Banco' means banker. All decisions are automatic based on fixed third-card rules, so no player skill or choice is involved after placing the bet.

A tie in blackjack where the player and dealer have the same hand total. The player's bet is returned with no win or loss. Pushes occur on about 8% of hands with basic strategy.

When the result lands exactly on the point spread or total, resulting in a tie. All bets are refunded. Half-point lines (e.g., -3.5) eliminate the possibility of a push. In parlays, a push usually reduces the parlay by one leg.

The commission taken by the poker room from each pot (typically 2.5-10% with a cap). In tournaments, the rake is included in the buy-in (e.g., $100+$10). The rake is the poker room's revenue, essentially the 'house edge' of poker.

The complete set of hands a player could hold in a given situation. Rather than putting opponents on one specific hand, skilled players think about ranges, meaning the spectrum of possible holdings based on their actions.

The most common even-money bet in roulette. Pays 1:1. Covers 18 numbers each. Probability of winning is 48.6% (European) or 47.4% (American) because zero/double-zero are neither red nor black.

A spinning column of symbols on a slot machine. Traditional slots had 3 mechanical reels; modern video slots display 5 or more virtual reels on a screen. Each reel contains a set number of symbol positions that determine the odds.

The statistical phenomenon where extreme results tend to be followed by more average results. A hot streak doesn't mean a player has 'found a system.' Results naturally drift back toward the mathematical expectation over time.

A bonus offered to existing casino players when they make additional deposits after their initial welcome bonus. Typically smaller than welcome bonuses (25-100% match) but can be claimed multiple times.

The practice of gambling within your means and maintaining control. Key principles: set time and money limits before playing, never chase losses, never gamble money you can't afford to lose, and seek help if gambling becomes a problem.

The percentage of wagered money that a game returns to players over time. RTP = 100% - House Edge. A slot with 96% RTP has a 4% house edge. Higher RTP means better odds for the player.

The probability of losing your entire bankroll. Even with positive expected value, aggressive betting can lead to ruin. The risk of ruin decreases with smaller bet sizes relative to bankroll.

The fifth and final community card in Texas Hold'em, dealt after the turn betting round. Also called 'fifth street.' No more cards to come, so hand values are final. River decisions are often for the largest bets.

Software that generates random outcomes in online casino games. Certified RNGs are tested by independent auditors (eCOGRA, iTech Labs) to ensure fairness. Every spin, card deal, and dice roll in online casinos uses an RNG.

In card counting, the cumulative total as cards are dealt. In Hi-Lo: cards 2-6 = +1, 7-9 = 0, 10-A = -1. The running count must be converted to a true count for accurate bet sizing.

The number of trials or observations in a dataset. In gambling, a small sample size leads to unreliable conclusions. Thousands of hands or spins are needed before results become statistically meaningful.

A special slot symbol that pays regardless of position on the reels (doesn't need to be on a payline). Scatters often trigger bonus features, free spins, or multipliers when a certain number appear.

A voluntary program allowing players to ban themselves from a casino or gambling site for a set period (typically 6 months to lifetime). Available at most licensed casinos. An important responsible gambling tool for those struggling with control.

Betting with a drawing hand that is currently behind but has the potential to improve to the best hand. For example, betting a flush draw on the flop. If opponents fold, you win immediately; if called, you can still hit your draw.

A single period of gambling from start to finish. Setting session limits (time and money) is a key bankroll management practice. Professional players track results by session to analyze performance.

A professional or highly skilled sports bettor whose wagers are respected by bookmakers. Sharp action moves lines. Sportsbooks may limit or ban sharp bettors. The opposite of a 'square' (recreational bettor).

A device that holds multiple decks of cards for dealing in table games. Standard blackjack shoes contain 6 or 8 decks. Fewer decks generally means better odds for the player and easier card counting.

The point after all betting rounds where remaining players reveal their hands to determine the winner. The best five-card hand wins the pot. If only one player remains (all others folded), there is no showdown.

An optional additional wager in table games, separate from the main bet. Common blackjack side bets include Perfect Pairs, 21+3, and Insurance. Side bets almost always have a much higher house edge (2-10%+) than the main game.

A roulette bet covering six numbers across two adjacent rows. Placed on the outer edge where two streets meet. Pays 5:1. Covers more numbers per chip than smaller inside bets.

Rolling a total of 2 (two ones) in craps. Also called 'aces.' Probability is 1/36 (2.78%). As a proposition bet, it typically pays 30:1 against true odds of 35:1, giving a house edge of 13.89%.

A rule specifying whether the dealer must hit or stand on soft 17 (Ace + 6). If the dealer hits soft 17 (H17), the house edge increases by about 0.2% compared to standing on soft 17 (S17). Always look for S17 tables.

A blackjack hand containing an Ace counted as 11. For example, A-6 is a 'soft 17.' Soft hands can't bust with one additional card because the Ace can be revalued to 1. Different basic strategy rules apply to soft hands.

A blackjack option available when dealt a pair (two cards of equal value). You split them into two separate hands, each with its own bet. Always split Aces and 8s; never split 10s or 5s.

A bet placed on the line between two adjacent numbers on the roulette layout. Pays 17:1. Covers two numbers with a single chip placement.

A recreational or casual sports bettor who tends to bet based on gut feelings, favorites, and popular teams. Sportsbooks profit primarily from square bettors. Square money typically comes in on favorites and overs.

A ceremonial tradition in big baccarat where the player with the largest bet slowly reveals the cards by peeling them from the edges. Purely for entertainment and drama, with no effect on the outcome.

To keep your current hand and take no more cards in blackjack. Basic strategy generally says to stand on hard 17+, and on hard 12-16 when the dealer shows 2-6 (expecting the dealer to bust).

A statistical measure of the spread of results around the expected value. In gambling, it helps predict how much your actual results might differ from the mathematical expectation over a given number of bets.

A sudden, sharp line movement caused by heavy betting action, often from syndicates or groups of professional bettors wagering simultaneously across multiple sportsbooks. Steam moves happen quickly and can shift lines significantly.

A casino bonus where the bonus amount cannot be withdrawn; only winnings from playing with it can be cashed out. Non-sticky bonuses (more player-friendly) use real money first, then bonus funds.

A wild symbol that stays in place for multiple spins, typically during free spin bonus rounds. Sticky wilds accumulate over the course of free spins, potentially covering large portions of the reels by the end of the feature.

A roulette bet on a single number. Pays 35:1 but has a probability of 2.7% (European) or 2.6% (American). Despite the high payout, the house edge is the same as any other roulette bet (2.7% European, 5.26% American).

A roulette bet covering three numbers in a horizontal row (e.g., 1-2-3 or 4-5-6). Placed on the outer edge of the row. Pays 11:1.

A blackjack option that lets you forfeit half your bet and give up your hand before playing it. Available in some casinos. Late surrender (after dealer checks for blackjack) is more common. Optimal on hard 16 vs dealer 9, 10, or Ace.

The minimum and maximum bets allowed at a particular table game. Limits vary by casino, game type, and time of day. Higher limit tables generally have better rules and fewer players.

A type of parlay where you can adjust point spreads in your favor in exchange for lower payouts. A 6-point NFL teaser moves each spread by 6 points. All selections must still win. Better mathematical value than standard parlays.

A physical or behavioral clue that reveals information about a player's hand. Common tells include hand trembling (strong hand), quick calls (draws), and extended tanking (marginal hands). Online tells include bet timing and sizing patterns.

The seat to the dealer's immediate right in blackjack, acting last before the dealer. Despite popular myth, the third-base player's decisions do not help or hurt other players in the long run.

The fixed rules in baccarat that determine whether the player or banker draws a third card. The player draws on 0-5 and stands on 6-7. The banker's decision depends on their total and what the player drew. These rules are automatic.

A re-raise, the third bet in a sequence (blinds are the first bet, an open raise is the second, and a re-raise is the third). Three-betting light (with non-premium hands) is a key weapon in modern poker strategy.

A bet that the player and banker hands will have equal totals in baccarat. Pays 8:1 but has a massive house edge of 14.36%. One of the worst bets in the casino. Should always be avoided.

A state of emotional frustration that leads to poor decision-making. Common triggers include bad beats, losing streaks, or personal issues. Recognizing and managing tilt is one of the most important skills in poker and gambling.

In card counting, the running count divided by the estimated number of decks remaining. The true count provides a more accurate measure of the player's advantage than the running count alone. A true count of +2 or higher typically indicates a player edge.

The actual mathematical probability of an event, expressed as a ratio. For example, the true odds of rolling a 7 with two dice are 5:1. When a casino pays less than true odds, the difference is the house edge.

The fourth community card in Texas Hold'em, dealt after the flop betting round. Also called 'fourth street.' The turn narrows hand possibilities and often increases bet sizes.

The total amount wagered over a given period, regardless of wins or losses. A player who bets $50 per hand for 200 hands has a turnover of $10,000. Wagering requirements and comp calculations are based on turnover.

The player sitting immediately to the left of the big blind, first to act pre-flop. The worst position in poker because you must act without information about other players' intentions. Requires the tightest hand selection.

The dealer's face-up card in blackjack, visible to all players. The upcard is the primary factor in basic strategy decisions. A dealer showing 2-6 is 'weak' (likely to bust); 7-A is 'strong.'

A bet made with a hand you believe is best, aiming to get called by a worse hand. The opposite of a bluff. Sizing value bets correctly (big enough to extract maximum value but small enough to get called) is a core poker skill.

A measure of how much results deviate from the expected value in the short term. High variance games have bigger swings, including longer losing streaks and bigger wins. Low variance games produce more consistent, predictable results.

The commission or fee charged by the house. In sports betting, the standard vig is 10% on losing bets (the -110 line). In baccarat, a 5% commission is charged on winning banker bets. Also called juice.

Often used interchangeably with variance, volatility describes how risky a game is. High volatility slots pay less frequently but with larger wins. Low volatility slots pay more often with smaller amounts. Medium volatility offers a balance between the two.

The number of times you must bet a bonus amount before you can withdraw winnings. A 30× wagering requirement on a $100 bonus means you must place $3,000 in total bets. Also called playthrough requirement.

A slot mechanic replacing traditional paylines. Matching symbols on adjacent reels (left to right) pay regardless of their vertical position. A 5-reel slot with 3 rows has 243 ways to win. Megaways slots can offer 100,000+ ways.

A very high-stakes gambler who wagers hundreds of thousands or millions of dollars. Whales are extremely valuable to casinos and receive lavish comps, private jet service, luxury suites, and personal casino hosts.

A slot symbol that substitutes for other symbols to create winning combinations (like a joker in cards). Some wilds come with multipliers, expanding features, or sticky properties during bonus rounds.

The green pocket numbered 0 on the roulette wheel. Zero gives the house its edge because even-money bets (red/black) lose on zero. European roulette has one zero (2.7% edge); American roulette adds a double zero (5.26% edge).