King's Gambit Accepted: Bonsch-Osmolovsky Variation
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Statistics from Lichess
453,740 games: White 46.2% / Draw 4.0% / Black 49.8%
| Next move | Games | White / Draw / BlackW / D / B |
|---|---|---|
| 243,726244K | ||
| 188,271188K | ||
| 7,6517,651 | ||
| 6,8876,887 | ||
| 2,3342,334 | ||
| 1,7601,760 | ||
| 774774 | ||
| 563563 |
Rated Lichess games between players rated 1600 to 2500, from the Lichess opening explorer, updated Nov 3, 2026
Engine evaluation
+0.05 The position is about equal
Best play: 4. Nc3 d5 5. d4 dxe4 6. Nxe4 Nd5 7. Bc4 Nc6 8. O-O Be7
Stockfish 19, depth 30, after the line's last move. Scores are in pawns, from White's side.
By rating
The stronger the players, the better this line does for Black: Black scores 48% under 1400, 53% at 2200 and up (wins plus half the draws).
| Players | Games | White / Draw / BlackW / D / B |
|---|---|---|
| Under 1400 | 19K | |
| 1400–1799 | 206K | |
| 1800–2199 | 282K | |
| 2200 and up | 24K | |
| Masters, over the board | 200 |
Master games
- Nepomniachtchi, I. – Svidler, P.
- Svidler, P. – Bacrot, E.
- Rapport, R. – Bacrot, E.
- Rapport, R. – Bacrot, E.
- Morozevich, A. – Sokolov, I.
Rated blitz, rapid and classical Lichess games by rating band, and over-the-board games of players rated 2200+ from the Lichess masters database, updated Sep 27, 2026
Overview
King's Gambit Accepted: Bonsch-Osmolovsky Variation (ECO C34, Open Games) is a gambit in the King's Gambit Accepted: King's Knight's Gambit, reached after 1. e4 e5 2. f4 exf4 3. Nf3 Ne7 (3 moves).
In 453,740 rated Lichess games between players rated 1600 to 2500, White won 46.2%, Black 49.8% and 4.0% were drawn. White's most played move here is 4. Bc4, in 54% of those games.
Written from the Lichess opening list and explorer. Know this line well? Write about it.
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How to play against the King's Gambit Accepted: Bonsch-Osmolovsky Variation
4. d4 scores best for White: 48.3%, with White winning 46.3% and Black 49.6% of 188K games. The most played answer, 4. Bc4, scores lowest: 47.9% in 244K games. Stockfish's first choice is 4. Nc3.
Main answers: those played in at least 5% of these games. Score: White's wins plus half the draws, in rated Lichess games between players rated 1600 to 2500. How to play against other popular openings
Popularity by year
The King's Gambit Accepted: Bonsch-Osmolovsky Variation has gained ground since 2016: 0.021% of Lichess games in 2025, up from 0.017%.
Numbers by year
| Year | Share of games | Games |
|---|---|---|
| 2016 | 0.017% | 5,926 |
| 2017 | 0.02% | 10,805 |
| 2018 | 0.019% | 14,703 |
| 2019 | 0.016% | 20,524 |
| 2020 | 0.014% | 42,262 |
| 2021 | 0.015% | 59,553 |
| 2022 | 0.017% | 63,113 |
| 2023 | 0.017% | 64,615 |
| 2024 | 0.019% | 66,755 |
| 2025 | 0.021% | 71,791 |
| 2026 (Jan–Apr) | 0.022% | 24,392 |
Share of rated Lichess games between players rated 1600 to 2500 (blitz, rapid and classical) that reach this position, by year; 2026: January to April. Which openings are rising and falling
Cite this page
Caissa Codex. “King's Gambit Accepted: Bonsch-Osmolovsky Variation (C34)”. Lichess data as of 3 Nov 2026. https://chesscodex.org/openings/kings-gambit-accepted-bonsch-osmolovsky-variation