Outs
补牌
**Outs** Outs refer to the specific number of cards not yet dealt in Texas Hold'em that can improve a player's current hand into a made hand (such as a straight, flush, three-of-a-kind, etc.). In practice, calculating the number of outs is the core basis for evaluating the value of a draw and deciding whether to call or raise, typically combined with pot odds to determine if an action is profitable. For example, if a player has a flush draw with four cards of the same suit already in hand, the remaining suit cards total nine – these nine are the outs. If the pot odds are favorable on the flop, the player can decide to call to see the turn card accordingly.
Context: Poker term article: Outs
Overview
Outs are a key concept in Texas Hold'em for measuring the value of a draw. They refer to the number of cards remaining in the deck that can help a player complete a specific made hand (e.g., straight, flush, three of a kind, etc.). The number of outs directly affects the probability of hitting the draw and the potential profit, and is an important basis for a player's decision to continue betting.
Calculation and Examples
Common Draw Outs
- Flush draw: You have four cards of a suit and need one more. There are 13 cards of that suit in the deck, so 9 remain (13 - 4 = 9), giving 9 outs.
- Open-ended straight draw: For example, holding 8-9 on a flop of 6-7-K. Any 5 or 10 makes a straight, for a total of 8 outs (four 5s and four 10s).
- Gutshot straight draw: For example, holding 8-9 on a flop of 6-10-K. Only a 7 completes the straight, giving 4 outs.
- Three of a kind improving to four of a kind: You hold a pair and flop three of a kind. There is one remaining card of that rank as an out.
Probability Estimation
- From flop to turn: Outs × 2% ≈ probability of hitting (e.g., 9 outs gives about 18%).
- From flop to river: Outs × 4% ≈ probability of hitting (e.g., 9 outs gives about 36%).
- Precise calculation requires considering the remaining cards, but the "Rule of 2 and 4" is a common approximation.
Strategic Application
The number of outs determines the potential odds of a draw. Players should compare outs with pot odds:
- If the pot odds are higher than the probability of hitting, calling is profitable.
- Example: Pot is 100, opponent bets 50, you need to call 50, so pot odds are 150:50 = 3:1. If you have 9 outs (about 36%), the odds against hitting are about 1.8:1. Since 1.8:1 is lower than 3:1, calling has positive expected value.
Additionally, the number of outs should consider whether the opponent might hold a stronger draw or made hand to avoid reverse implied odds. For instance, on a flush draw, if the opponent might have a larger flush, your actual outs are reduced.
Notes
Outs are not absolute; they should be dynamically adjusted based on board structure and opponent range. For example, when the board has a pair, a flush draw may run into a full house, lowering the value of outs. Also, outs can help calculate the fold equity of a semi-bluff, improving overall strategic efficiency.