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Gutshot straight draw vs top pair: the odds

What are the odds of a gutshot straight draw against top pair?

Hand Cards Wins Equity
Gutshot 5♥ 3♦ 20.3% 20.3%
Top pair A♠ 7♣ 79.7% 79.7%
Split pot 0.00%

On a 7♠ 6♦ 2♣ flop, with two cards to come. Equity is each hand's average share of the pot — outright wins plus half of the split pots. Computed by enumerating all 990 possible boards with this site's own engine, so these are exact figures rather than a simulation.

Why the number looks like that

Four outs, about 17% by the river. The number worth memorising, because it is almost exactly the price a pot-sized bet asks — meaning a bare gutshot is a call only when there is more money to win later.

Try it yourself

Open this hand in the calculator

The calculator runs the same engine in your browser: change a card, deal the rest of the board, or add a third player and watch the numbers move.