In chapter 5 of The Theory of Poker, David Sklansky explains the idea of pot odds and shows how comparing the price of a call to your chances of winning should guide almost every decision to call or fold.
What Pot Odds Are
Pot odds are simply the ratio between the amount in the pot and the cost of calling a bet.
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If there’s $50 in the pot and it costs you $10 to call, you’re getting 5-to-1.
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If you believe you’ll win more often than 1 in 6 in that spot, calling is profitable; if you think you’ll win less often, you should fold.
Pot odds are the bridge between probability and expectation: they tell you whether a call gains or loses money in the long run.
When All the Cards Are Out
On the final betting round, the math is conceptually simple but practically hard:
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You compare your estimate of how often your hand is best to the odds the pot is laying you.
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If you can only win by catching a bluff, you must estimate how often this particular opponent bluffs in this spot.
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With marginal made hands (like two pair, top pair, etc.), the difficulty is mostly judgment: reading opponents and situations, not doing exact combinatorics.
Your experience and your ability to read players determine whether you can correctly decide if your hand beats enough of their betting range to justify a call.
When There Is One Card to Come
When you know you need to improve (e.g., drawing to a flush or straight), the math becomes clearer:
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You count unseen cards and outs (cards that make your hand).
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Example: in five-card draw, with four cards to a flush, 9 cards out of 47 complete your hand. That gives odds a bit over 4-to-1 against.
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With four to an open-ended straight, 8 outs give you slightly worse odds than a flush draw.
You then compare:
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Odds of hitting vs. pot odds.
If the pot odds are better than the odds against improving, calling has positive expectation.
If the pot odds are worse, calling is a long-term loser unless implied odds (future money you can win) are large enough to compensate.
Antes matter here: bigger antes inflate the pot, making calls with draws more justifiable. With no ante and few callers, the pot may be too small to justify chasing.
The Impact of Exposed Cards (Stud and Razz)
In open-card games, you must adjust for:
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Needed cards that are already visible or folded
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If several of your outs are showing on other boards or were folded, your chance to improve drops sharply.
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Sometimes a hand that would normally be playable becomes unplayable simply because too many key cards are gone.
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Total number of exposed cards
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Occasionally, the visible cards can improve your odds (e.g., many “useless” cards are gone, leaving a higher proportion of helpful cards in the deck).
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Ignoring exposed cards means misjudging your true improvement chances, often turning what looks like a good call into a bad one.
Position and Future Raises
Pot odds are not just about the current bet; they are about what you are really facing:
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If you face a bet with aggressive players behind you, you must consider the chance of a raise and possibly a re-raise.
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The true price of continuing may be much higher than the current single bet.
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As the pot escalates between other players, your odds might shrink and your winning chances may decrease (their big action often means stronger hands).
In games like hold’em, draw, and stud, position can turn what looks like a decent-priced call into a bad one because you are “trapped in the middle” between bettor and potential raisers.
Extra Outs and Their Hidden Value
Many players fail to credit themselves with all their outs:
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With a four-flush you obviously count flush cards, but:
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You might also have two pair that can improve to a full house.
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You might have a straight draw on top of your flush draw.
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Each type of improvement adds to your total chance of winning.
Even a long-shot extra out (like a backdoor possibility or a single card to make a full house) can meaningfully improve your overall odds when added to your main draw. Sometimes this converts a fold into a correct call when compared to the pot odds.
Drawing to the Second-Best Hand
A crucial danger is drawing to a hand that may not be good even if you hit:
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You may be drawing dead (no card in the deck can help you win) — for example, chasing a flush when your opponent already has a better flush locked up.
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Or you may hit your hand, but your opponent improves to an even bigger hand with the same card that helped you.
In situations where:
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You are already behind, and
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There is a non-trivial chance your made hand still loses,
your effective winning chances are lower than the simple “odds to improve” suggest. Sklansky shows how adjusting for this (e.g. multiplying by the chance your hand will actually be best) can turn a seemingly profitable call into a fold.
Good players routinely fold in these dangerous spots; weaker players call “on the come” without considering that their perfect card might still leave them second-best.
Key Factors in Pot-Odds Decisions (With One Card to Come)
Sklansky ends the chapter by summarizing what you must weigh when deciding whether to call with a drawing hand (one card to come in stud/draw):
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Your chance to improve, adjusted for exposed cards and extra outs.
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Your chance to win even if you improve, accounting for drawing dead or being outdrawn.
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True pot odds, including possible raises behind you.
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Implied odds — how much extra you expect to win on later betting if you make your hand (developed more fully in Chapter 7).
Used correctly, pot odds let you turn messy decisions into clear “call” or “fold” choices and prevent you from making emotionally driven, long-term losing calls.