Chessy
Sicilian Defense: The Old Sicilian Bb5 – How to Play 3...Nd4
You've played the Sicilian, and White has tried something tricky: 1.e4 c5 2.Nf3 Nc6 3.Bb5. Instead of backing up, you immediately challenge the bishop with 3...Nd4 — and you're already on the right track. This is the Old Sicilian Bb5, a line where White often regrets leaving the main paths. The database shows Black scores 50.4% from here, while White only wins 46.1%. That's good news for you. Below you'll find everything you need to handle White's best replies, punish their mistakes, and turn this into a comfortable Black middlegame.
Play the Sicilian Defense: Old Sicilian: Bb5 against the engine
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The knight jump 3...Nd4 immediately takes control of the centre and attacks the bishop on b5. Instead of a standard Sicilian where White has a comfortable edge, you force White to make a decision: trade on d4 or retreat the bishop. In either case, you're dictating the pace. The knight on d4 is a thorn in White's side — it eyes c2, can't easily be kicked away by pawns, and if White does capture, you get the c-file half-open with ...cxd4. The engine evaluation of +0.78 means White keeps a slight edge in theory, but the practical stats tell a different story: you outscore White from this position. That's because the position is simpler to play for Black — you know where your pieces belong, while White has to find accurate moves.
The Engine's Choice: Nxd4
White's best move, and by far the most common, is 4.Nxd4 (played in 480,090 games). The exchange is straightforward: 4.Nxd4 cxd4. Now you have a doubled d-pawn but open lines for your pieces — your queen and dark-squared bishop get the long diagonal, and your rook will enjoy the semi-open c-file. The engine's suggested continuation runs c3 a6 — White tries to challenge your pawn centre, and you immediately gain space with ...a6, chasing the bishop. This is a fighting line where you're not worse; you're simply playing a different type of Sicilian. Don't fear the doubled pawn — it gives you the d5 square for a knight and central control.
The Statistics: Most-Played Replies
The numbers reveal what actually happens in real games, and they're very helpful for your preparation. Here's how White's options stack up after 3...Nd4 across 555,774 Lichess games: - Nxd4 (480,090 games) — White scores 46.8%. This is the main line and you should be ready for it. - Bc4 (26,769 games) — White scores 49.3%, still slightly below par. The bishop retreats to a safe square but you keep the knight on d4. - Nc3 (13,504 games) — White scores 47.0%, but this is actually a mistake. More on that below. - c3 (6,586 games) — White scores just 23.6%. - O-O (5,611 games) — White scores only 27.2%. - Ba4 (5,318 games) — White scores 47.4%. The key takeaway: no matter what White plays, they score below 50% from this position. You're already in a favourable practical spot.
Punish White's Mistakes
Some of White's most natural-looking moves are severe errors. The engine flags three of them: - 4.c3 is a blunder — it loses about 4.3 pawns. White tries to kick your knight with the c-pawn, but after you capture on f3 or retreat, White's position collapses. You should be winning. - 4.O-O is also a blunder — loses about 4.2 pawns. Castling into a position where your knight controls d4 and threatens tactics is a classic trap. Don't let White get away with it. - 4.Nc3 is an inaccuracy — loses about 0.9 pawns. It looks active, but White should have taken on d4 first. You can reply ...a6 and emerge with a pleasant position. When you see any of these moves in the drill or your games, trust the evaluation and look for the most forcing continuation. Your advantage is real.
Results across 555,774 Lichess games
| Most-played continuation | Games | White wins |
|---|---|---|
| Nxd4 | 480,090 | 46.8% |
| Bc4 | 26,769 | 49.3% |
| Nc3 | 13,504 | 47.0% |
| c3 | 6,586 | 23.6% |
| O-O | 5,611 | 27.2% |
| Ba4 | 5,318 | 47.4% |
Frequently asked questions
Is 3...Nd4 a good move in the Sicilian against Bb5?
Yes — it's the most principled and statistically successful reply. Black scores 50.4% from this position compared to White's 46.1%, which means you're slightly more likely to win than your opponent in practice, despite the engine giving White a +0.78 edge.
What should Black do after White plays 4.Nxd4?
Recapture with 4...cxd4. You'll have a doubled d-pawn, but this opens the c-file for your rook and gives your queen and dark-squared bishop strong play. The engine's main continuation is ...a6, chasing the bishop on b5 before White can play c3.
Is 4.c3 a good move for White against 3...Nd4?
No — 4.c3 is a blunder that loses roughly 4.3 pawns. White tries to kick your knight, but it backfires badly. You should be able to win quickly if your opponent plays this.
Why does the engine say White is better if Black scores more wins?
The engine evaluation (+0.78) is a theoretical assessment assuming perfect play from both sides. In practice, the position is easier for Black to handle, and White is more likely to make a mistake. The 50.4% win rate for Black reflects that human reality.
How many games feature the Sicilian Defense: Old Sicilian: Bb5?
Over 555K Lichess games have reached the Sicilian Defense: Old Sicilian: Bb5 position. White wins 46.1%, Black wins 50.4%, with 3.5% draws — based on real rated games.