Italian Game: Rousseau Gambit
The Rousseau Gambit is 1.e4 e5 2.Nf3 Nc6 3.Bc4 f5: Black meets the Italian Game by attacking White's e-pawn with the f-pawn. Read the guide
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Statistics from Lichess
2,519,557 games: White 46.2% / Draw 3.3% / Black 50.5%
| Next move | Games | White / Draw / BlackW / D / B |
|---|---|---|
| 910,411910K | ||
| 860,189860K | ||
| 377,735378K | ||
| 166,128166K | ||
| 80,82081K | ||
| 63,97464K | ||
| 16,61917K | ||
| 14,76015K |
Rated Lichess games between players rated 1600 to 2500, from the Lichess opening explorer, updated Nov 7, 2026
Engine evaluation
+1.49 White is better
Best play: 4. d4 fxe4 5. Nxe5 d5 6. Bb5 Qd6 7. c4 a6 8. Bxc6+ bxc6
Stockfish 19, depth 30, after the line's last move. Scores are in pawns, from White's side.
By rating
Rating changes little here: Black scores 52% under 1400, 50% at 2200 and up (wins plus half the draws).
| Players | Games | White / Draw / BlackW / D / B |
|---|---|---|
| Under 1400 | 1.2M | |
| 1400–1799 | 2.3M | |
| 1800–2199 | 1.2M | |
| 2200 and up | 44K | |
| Masters, over the board | 15 |
Master games
- Spasov, V. – Dimitrov, P.
- Bojkov, D. – Dimitrov, P.
- Novik, M. – Kiik, K.
- Reeh, O. – Bach, M.
- Matthey, H. – Sobolevsky, L.
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 26, 2026
Description
The Rousseau Gambit is 1.e4 e5 2.Nf3 Nc6 3.Bc4 f5: Black meets the Italian Game by attacking White's e-pawn with the f-pawn. It is named after the French master Eugène Rousseau and is also called the Ponziani Countergambit, after Domenico Lorenzo Ponziani.
The idea
The move ...f5 weakens Black's own kingside, where the bishop on c4 is aiming. White's key themes are to attack Black's kingside and to stop Black from simplifying the position. Trading off White's light-squared bishop is particularly suspect.
Main lines
- 4.d4 gives White a clear advantage. After 4...fxe4 5.Nxe5 d5 6.Bb5 Ne7 7.O-O a6 8.Bxc6+ bxc6 9.f3 Bf5 10.Nc3 White is better, according to the Bilguer Handbuch. After 4...d6 5.dxe5 dxe5 6.Qxd8+ Nxd8 7.Nxe5 fxe4 8.Bd2 Bd6 9.Bc3 White is also better: this was played in a consultation game in London in 1857, with Morphy and Mongredien on the black side. 4...Nf6 5.dxe5 Nxe4 6.O-O Bc5 7.Nc3 Nxc3 8.bxc3 leads to the same verdict.
- 4.d3 declines the gambit: White supports the e-pawn and waits to take on f5. The position resembles a King's Gambit Declined with colours reversed, with White's bishop aiming at Black's weakened kingside. Black will have trouble castling short, and Ng5 is a likely threat. White's position is better but still needs careful play. 4...Bc5 here transposes to the Lucchini Gambit.
- 4.exf5 is inferior. White still has a good game, but the position is less clear. Black usually plays 4...e4, which White may meet with 5.Nd4 Nf6 6.Nxc6. Here 5...Nxd4 runs into trouble after 6.Qh5+.
Who should play it
Theory gives White the better game after both 4.d4 and 4.d3, so a White player who knows these lines has little to fear. In online play, though, Black does well with it, as the numbers below show.
The numbers
On Lichess Black does better than White: in 2.5 million games Black wins 50.5% and White 46.2%. Black stays ahead up to 2199, winning 50.9% under 1400 and 49.9% between 1800 and 2199. From 2200 up the picture flips: White wins 48.0% and Black 47.3%. There are too few master games over the board, 15, to say anything.
Suggest an improvement or report a mistake
How to play against the Italian Game: Rousseau Gambit
4. d4 scores best for White: 55.9%, with White winning 54.2% and Black 42.5% of 378K games. The most played, 4. d3, scores 53.6% in 910K games, and 4. exf5 scores lowest: 40.4%. Stockfish's first choice is also 4. d4.
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 Italian Game: Rousseau Gambit is played more than five times as often as in 2016: 0.17% of Lichess games in 2025, up from 0.03%.
Numbers by year
| Year | Share of games | Games |
|---|---|---|
| 2016 | 0.03% | 10,883 |
| 2017 | 0.032% | 17,821 |
| 2018 | 0.032% | 24,836 |
| 2019 | 0.036% | 45,385 |
| 2020 | 0.036% | 104,578 |
| 2021 | 0.038% | 147,926 |
| 2022 | 0.086% | 321,339 |
| 2023 | 0.13% | 502,114 |
| 2024 | 0.15% | 529,702 |
| 2025 | 0.17% | 584,157 |
| 2026 (Jan–Apr) | 0.16% | 180,641 |
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
Transpositions
Sources
- History and theory: adapted from the Wikipedia article Rousseau Gambit, version of 26 October 2026, under CC BY-SA 4.0.
- Results: Lichess opening explorer, figures collected from September to November 2026.
Cite this page
Caissa Codex. “Italian Game: Rousseau Gambit (C50)”. Lichess data as of 7 Nov 2026. https://chesscodex.org/openings/italian-game-rousseau-gambit