Chessy
The Slav Indian: Kudischewitsch Gambit – Black's Bold Pawn Sacrifice
You're playing Black and the game has started 1.d4 c6 2.Nf3 Nf6 3.c4 b5. With your last move you've offered a pawn — the Kudischewitsch Gambit. White can accept it, decline it several different ways, or even stumble into a mistake. This page breaks down what happens next, what the numbers say about your chances, and how to handle White's most common responses. The interactive drill below lets you practise the position against an engine that adapts to your moves.
Play the Slav Indian: Kudischewitsch Gambit against the engine
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Try the Kudischewitsch Gambit against our adaptive engine below — practise the main lines, test the tricky 4.Bg5 refutation, and see if you can improve on Black
Create a free account →What You're Fighting For
The Kudischewitsch Gambit is an early attempt to seize the initiative from Black's side. By playing 3...b5, you challenge White's centre immediately and try to open lines for your pieces before White has fully developed. If White takes on b5, you recapture with the c-pawn and get a semi-open c-file for your rook, plus you've eliminated White's chance to build a big pawn centre with c4 and d4. Even though Stockfish gives +0.58 — a small edge for White — the practical results across 1,516 games tell a different story. White wins 56.9% of the time, but Black still scores 40.4% wins, with only 2.7% draws. That means one in every three games Black wins outright, which is a respectable result for a gambit. You're fighting for activity and imbalance, not a safe equality.
White's Best Move: Taking the Pawn
The engine's top choice is 4.cxb5, accepting the gambit. After 4...cxb5, White usually continues 5.e3, preparing to develop the bishop and support the d4 pawn. The natural plan from here is 5...b4 — pushing the passed b-pawn forward to gain space and cramp White's queenside. This is the main line, played in 387 games from the diagram position. White scores 58.7% in this line, so you are slightly worse according to the engine, but you have clear counterplay. Your b-pawn becomes a long-term nuisance; White often has to spend moves dealing with it while you finish development and target the centre. If White ever lets you play ...Bb7 and ...e6, your position becomes very solid despite being a pawn down.
When White Declines the Gambit
White can also decline the pawn in several ways, and each leads to a different type of game. The most popular decline is 4.e3 (344 games, White scores 57.0%), where White simply ignores the gambit and develops. This is a sensible approach — you should respond with 4...bxc4, winning a pawn for now (White will likely recapture with Bxc4 next move). Another frequent choice is 4.Nc3 (237 games, White scores 58.6%), which fights for the centre. Here you can play 4...b4, pushing the pawn again and gaining space. Watch out for 4.c5 (228 games, White scores 52.6%), which is the most passive option — White closes the centre. Black scores a solid 47.4% against 4.c5, so this may actually be your best chance statistically. Avoid 4.b3 (122 games, White scores 63.9%), which is quite dangerous for you — White prepares a fianchetto and keeps the tension; Black scores only 36.1% here.
Punishing White's Mistake: 4.Bg5
The one move to watch for is 4.Bg5. Played in 58 games from this position, it scores only 50.0% for White — and the engine calls it a clear mistake, losing roughly 1.2 pawns' worth of advantage. The move looks natural (pinning the knight), but it fails tactically because after 4...bxc4, White has no good way to regain the pawn. The bishop on g5 is vulnerable, and Black simply keeps the extra pawn. If you see 4.Bg5, take on c4 and enjoy a comfortable advantage. The correct move for White was 4.cxb5, so if your opponent plays anything else, you are already doing well — and if they play Bg5, you are doing even better.
Results across 1,516 Lichess games
| Most-played continuation | Games | White wins |
|---|---|---|
| cxb5 | 387 | 58.7% |
| e3 | 344 | 57.0% |
| Nc3 | 237 | 58.6% |
| c5 | 228 | 52.6% |
| b3 | 122 | 63.9% |
| Bg5 | 58 | 50.0% |
Frequently asked questions
Is the Kudischewitsch Gambit sound?
It is not completely sound at the engine level — Stockfish gives White a small edge of +0.58 — but it is perfectly playable in club chess. Black scores 40.4% wins across 1,516 games, with very few draws (2.7%), meaning most games are decisive. It's a sharp, fighting choice.
What should Black do after 4.cxb5?
Recapture with 4...cxb5, developing your queen's pawn. White usually continues 5.e3, and your best reply is 5...b4, pushing the passed pawn to gain space and restrict White's knights. You are a pawn down but have active piece play and a lasting queenside nuisance.
What is the best way for White to decline the gambit?
The most common decline is 4.e3 (344 games), which scores 57.0% for White. Another is 4.Nc3 (237 games, 58.6%). The most dangerous decline for Black is 4.b3 (122 games), where White scores 63.9% — you want to avoid this line if possible.
Is 4.Bg5 a mistake for White?
Yes. 4.Bg5 loses roughly 1.2 pawns of advantage according to the engine. The correct move was 4.cxb5. If White plays 4.Bg5, you simply take on c4 and keep the extra pawn — White has no good way to regain it.