One hand tells you little
A single deal shows who won this time. How often a hand wins only shows up over many boards, which is what the second button does: it keeps the hole cards and deals the rest again and again, a run. Here are pocket aces against pocket kings, all in before the flop, over runs of growing size with a fixed seed. The exact figure, over every possible board, is 81.9%.
| Boards dealt | Aces win | Off the exact figure |
|---|---|---|
| 10 | 100.0% | 18.1 points |
| 100 | 87.0% | 5.1 points |
| 1,000 | 83.1% | 1.2 points |
| 10,000 | 81.2% | -0.7 points |
Ten boards can land far from the truth; ten thousand are within a fraction of a point. The same goes for your own results: a few sessions say little about how well you play. The variance calculator shows how far a real win rate swings.
How the simulator deals
Each deal shuffles a 52-card deck with a seeded random number generator, so "Deal a new hand" moves to the next seed and the same seed always gives the same cards. Cards go two to each player and five to the board, and every hand is scored by its best five of seven cards. For exact equity with your own cards and board, use the poker odds calculator, which counts every remaining board rather than sampling.