Source Lichess
White wins at least 16.8 more of every 100 games than it loses
how far wins run ahead of losses, 90% confident
At All Ratings, Semi-Slav Defense: Gunderam Gambit keeps White's wins running +16.8% ahead of its losses at worst, 90% confident, from 11K Lichess games. This gambit is effective. Win rate, draw rate and loss rate come from games played December 2023 to November 2025.
| Rating | Edge at worst | White Win | Draw | White Loss | Games |
|---|---|---|---|---|---|
| 1000-1199 | −16.8% | 51.4% | 2.8% | 45.8% | 52 |
| 1200-1399 | +15.5% | 65.5% | 0.5% | 34.0% | 97 |
| 1400-1599 | +9.7% | 58.1% | 2.2% | 39.6% | 333 |
| 1600-1799 | +13.5% | 58.4% | 2.2% | 39.4% | 868 |
| 1800-1999 | +17.7% | 59.1% | 2.9% | 38.0% | 2.2K |
| 2000-2199 | +16.0% | 57.5% | 3.4% | 39.1% | 4.8K |
| 2200-2499 | +12.2% | 55.6% | 4.2% | 40.2% | 2.5K |
| 2500+ | +10.0% | 58.1% | 5.1% | 36.9% | 206 |
At some ratings. White comes out ahead at 1200+; at the other ratings we can see, the games do not show it paying. Where it pays changes with the clock, so set yours above and look again.
White wins 57.5% of Semi-Slav Defense: Gunderam Gambit games, draws 3.3% and loses 39.2%. That rests on 11K games from Lichess.
1800-1999. There White wins at least 17.7 more of every 100 games than it loses (90% confident), its highest Edge at worst.
Blitz. For White, the Edge at worst — how far wins run ahead of losses, 90% confident — is +13.6% in Blitz (4.8K games) and +7.2% in Rapid (441 games).
Yes. The first rating where the games do not show White coming out ahead is 1400-1599 in Blitz and 1600-1799 in Rapid. In Bullet, White comes out ahead at every rating we can see.
The Semi-Slav Defense: Gunderam Gambit is extremely sharp: 3.3% of its games are drawn, so 96.7% end with a winner.
At 1200+, where White comes out ahead. At the other ratings we can see, the games do not show it paying. Where it pays changes with the clock, so set yours above and look again.
As Black, take the material, then develop fast, castle early, and trade pieces. Give the material back when doing so kills the attack. At 1200+, White still comes out ahead in these games; at the other ratings we can see, the games do not show the gambit paying.
This rests on 11K games from Lichess. Every figure carries the range it is in, 90% confident, and the table above shows how many games sit behind each rating and each clock — the fewer there are, the wider that range.