99 vs 66 equity
Preflop, 99 beats 66 with exact equity 81.18% vs 18.82%: 99 wins 80.86%, 66 wins 18.50%, ties 0.64%. Computed by exhaustively enumerating all 10,273,824 deals.
| 99 Win | 80.86% |
|---|---|
| 66 Win | 18.50% |
| Tie | 0.64% |
| 99 Equity (win + tie/2) | 81.18% |
| 66 Equity (win + tie/2) | 18.82% |
| Boards enumerated | 10,273,824 |
| Suit combinations | 6 |
| Losing frequency | 99 loses 1 in 5.4 |
Note: class-average values. Specific suit combinations (e.g. shared suits) shift the numbers by a few tenths of a percent.
FAQ
Who wins more often, 99 or 66?
99 is ahead: 99 has 81.18% equity vs 18.82% (exact enumeration).
How often do 99 vs 66 tie?
Ties occur 0.64% of the time (66,174 of 10,273,824 outcomes).
Are these numbers simulated?
No. All 10,273,824 board combinations are exhaustively enumerated — mathematically exact and reproducible.
Related
Figures from app/data/matchup-matrix (exhaustive engine scripts/gen-matchup-matrix.mjs, cross-validated against lib/poker-equity.ts)
Cite this page: Pailiku, “99 vs 66 equity”, pailiku.com/matchups/99-vs-66 (2026).