--- title: "A2s vs 43s: preflop equity" url: "https://georgelipoker.com/equity/a2s-vs-43s.md" canonical_url: "https://georgelipoker.com/equity/a2s-vs-43s" last_updated: "2026-10-23" type: "reference" summary: "Who is ahead, A2s or 43s? A2s leads 57.54% to 42.46% before the flop, counted exactly over every board, with the split by flop type and suit." related: ["https://georgelipoker.com/equity/qto-vs-43s.md", "https://georgelipoker.com/equity/a2s-vs-53s.md", "https://georgelipoker.com/equity/jts-vs-43s.md"] --- # A2s vs 43s: preflop equity Who is ahead, A2s or 43s? A2s leads 57.54% to 42.46% before the flop, counted exactly over every board, with the split by flop type and suit. In equity, A2s against 43s stands at 57.54% to 42.46%, a gap of 15.08 points. ## A2s against 43s: the numbers **Exact preflop results for A2s against 43s, in percent** | Hand | Wins | Ties | Loses | Equity | | --- | --- | --- | --- | --- | | A2s | 57.217 | 0.644 | 42.139 | 57.539 | | 43s | 42.139 | 0.644 | 57.217 | 42.461 | A2s meets 43s, and both are suited hands. Neither hand shares a rank with the other, so this is a contest of high cards, connection and suits. The lead is steady rather than large, and the flop still has plenty of say in who wins. Ties are part of the picture: 0.64% of boards end in a split pot, and each side counts that as half a win. A2s ranks number 46 of 169 starting hands, and 43s ranks number 150, by equity against a random hand. **Boards behind the percentages: 27,396,864 counted in all** | Hand | Boards won, about | Boards tied, about | Boards lost, about | | --- | --- | --- | --- | | A2s | 15,676,000 | 176,000 | 11,545,000 | | 43s | 11,545,000 | 176,000 | 15,676,000 | The total is exact: 16 specific deals times 1,712,304 boards. The three counts are approximate, worked out from the percentages to five decimals and rounded to the nearest thousand. **A2s against 43s read as odds** | Hand | Equity as odds (to 1) | Wins one deal in | Loses one deal in | Pot odds needed to call (to 1) | | --- | --- | --- | --- | --- | | A2s | 1.355 | 1.748 | 2.373 | 0.738 | | 43s | 0.738 | 2.373 | 1.748 | 1.355 | The final column gives the least the pot must offer for each unit called for a call to break even at this equity. ## Who is ahead on which flops Break the boards down by their first three cards and A2s is strongest on paired flops (63.88%) and weakest on low rainbow flops (nine high or lower) (37.04%). The lead reverses on low rainbow flops (nine high or lower): there 43s is the favorite even though A2s is ahead overall. **A2s against 43s by flop texture, in percent** | Flop | Share of flops | A2s wins | Ties | 43s wins | A2s equity | | --- | --- | --- | --- | --- | --- | | Rainbow, ten or higher | 25.220 | 60.915 | 0.282 | 38.803 | 61.056 | | Rainbow, nine or lower | 5.689 | 36.427 | 1.222 | 62.351 | 37.038 | | Two-tone | 46.727 | 55.928 | 0.400 | 43.672 | 56.128 | | Monotone | 5.273 | 52.948 | 3.701 | 43.351 | 54.799 | | Paired | 17.091 | 63.523 | 0.710 | 35.767 | 63.878 | Flop types: rainbow means three different suits, two-tone means one suit twice, monotone means one suit three times, paired means a repeated rank. ## Compared with a random hand How much does the opponent matter? Compared with its random-hand 57.38%, A2s changes by +0.16 points, and 43s, from 38.64%, by +3.82. **A2s and 43s here compared with each against a random hand, in percent** | Case | Equity here | Against a random hand | Change in points | Times the random-hand equity | | --- | --- | --- | --- | --- | | A2s, all flops | 57.539 | 57.379 | +0.160 | 1.00279 | | A2s, rainbow, ten or higher | 61.056 | 57.379 | +3.677 | 1.06408 | | A2s, rainbow, nine or lower | 37.038 | 57.379 | -20.341 | 0.64550 | | A2s, two-tone | 56.128 | 57.379 | -1.251 | 0.97820 | | A2s, monotone | 54.799 | 57.379 | -2.580 | 0.95504 | | A2s, paired | 63.878 | 57.379 | +6.499 | 1.11326 | | 43s, all flops | 42.461 | 38.642 | +3.819 | 1.09883 | | 43s, rainbow, ten or higher | 38.944 | 38.642 | +0.302 | 1.00782 | | 43s, rainbow, nine or lower | 62.962 | 38.642 | +24.320 | 1.62937 | | 43s, two-tone | 43.872 | 38.642 | +5.230 | 1.13534 | | 43s, monotone | 45.201 | 38.642 | +6.559 | 1.16974 | | 43s, paired | 36.122 | 38.642 | -2.520 | 0.93479 | ## Does a shared suit matter? Looking only at deals where the hands share a suit, A2s has 59.46%; looking only at deals where they do not, 56.90%. A2s does better with a shared suit, by 2.56 points. **A2s against 43s by suit overlap, in percent** | Deals | Specific deals | Share of deals | A2s wins | Ties | 43s wins | A2s equity | | --- | --- | --- | --- | --- | --- | --- | | Share a suit | 4 | 25.00 | 59.100 | 0.723 | 40.177 | 59.461 | | No shared suit | 12 | 75.00 | 56.590 | 0.617 | 42.793 | 56.898 | ## How often this matchup comes up This page stands for 16 specific-card matchups (0.0010% of 1,624,350 ordered deals), or 32 once you count the seats both ways (0.0020%). ## A worked example With $100 from each side, the $200 pot is split on average as $115.08 for A2s and $84.92 for 43s; the first side gains $15.08 per all-in and the second gives up $15.08. A thousand deals look like this: A2s takes 572, 43s takes 421, 7 are ties. ## The same matchup from the other side Read it from the other side: 43s against A2s is the same matchup with the numbers swapped, so 43s holds 42.46% and A2s holds 57.54%. That address sends you back to this page. ## Keep exploring As2s against 4h3h is a ready-made deal for the calculator, with no suit in common between the hands. The neighboring matchups below replace one hand with another of similar strength. - [Open As2s against 4h3h in the equity calculator](https://georgelipoker.com/tools/equity-calculator.md#p1=As2s&p2=4h3h) - [A2s combos](https://georgelipoker.com/combos/a2s.md) - [43s combos](https://georgelipoker.com/combos/43s.md) - [QTo vs 43s](https://georgelipoker.com/equity/qto-vs-43s.md) - [A2s vs 53s](https://georgelipoker.com/equity/a2s-vs-53s.md) - [JTs vs 43s](https://georgelipoker.com/equity/jts-vs-43s.md) - [All hand matchups](https://georgelipoker.com/equity.md) ## How this was computed The figures are counted, not estimated: 1,712,304 boards for every suit pattern of the 16 specific deals, with both seven-card hands compared each time. Equity gives half a win for a tie. For the flop rows, a board is counted once under each of the ten flops inside it. Source: our own exact count from the GeorgeLiPoker poker math library. No outside data is used. ## Related - [QTo vs 43s: preflop equity](https://georgelipoker.com/equity/qto-vs-43s.md) - [A2s vs 53s: preflop equity](https://georgelipoker.com/equity/a2s-vs-53s.md) - [JTs vs 43s: preflop equity](https://georgelipoker.com/equity/jts-vs-43s.md)