Chessy
Sicilian Defense: Open: d6 – A Clear Advantage for White
You've played 1.e4 c5 2.Nf3 Nc6 3.d4 d6 and now you push with 4.d5 — kicking the knight and grabbing space. Stockfish evaluates this position at +1.17, a clear and lasting advantage in your favour. Across over 350,000 games on Lichess, White wins 56.6% of the time, with only 4.1% draws. That's a punishing score for Black if they don't know what they're doing. Your job now is to choose the right response to Black's knight move and keep the pressure on. The interactive drill below will help you practice the critical lines.
Play the Sicilian Defense: Open: d6 against the engine
Free, no signup — you play white, the engine adapts to your level.
Play the interactive drill below to practise meeting 4...Nb8, 4...Ne5, and the common mistakes with perfect engine-approved replies. Create a free account to to
Create a free account →The Big Idea: Space and a Weak Knight
After 4.d5 you've driven Black's knight away from the centre early in the opening. Black's knight on c6 has to move, and none of its options are comfortable. The engine's best reply for Black is to retreat all the way back to b8 — a huge concession that gains you a lead in development and central dominance. If Black tries to fight back with a flashy knight move like 4...Ne5, 4...Nb4, or 4...Nd4, you have a chance to punish them. The key principle here is simple: when you've gained space, don't give it back. Keep your centre solid, develop naturally, and look for ways to exploit Black's cramped position.
The Engine's Answer: 4...Nb8
Stockfish's top pick for Black is 4...Nb8, retreating the knight to its starting square. That already tells you how difficult this position is for Black. The engine's planned continuation runs Nb8 Bb5+ Nd7 e5 — White develops with a check, forces Black to block with the knight, then immediately hits the centre with e5. You gain time, space, and a lead in development. Even though this is Black's best try, your score is still outstanding: White wins 52.7% of the 52,637 games that reach this position. Practise meeting 4...Nb8 with the confident follow-up Bb5+ and see how uncomfortable Black's position becomes.
Most-Played Replies and How You Score
The most popular move by far is 4...Ne5, seen in 210,091 games. White still scores a healthy 56.0% against it. The engine prefers 4...Nb8, but club players often choose 4...Ne5, hoping to complicate things. The other common moves all give you even better results: 4...Nb4 (35,891 games, White scores 58.7%), 4...Nd4 (25,496 games, White scores 59.7%), 4...Na5 (12,996 games, White scores 57.0%), and the cheeky 4...Qa5+ (6,076 games, White scores a crushing 66.7%). Whatever Black throws at you, the statistics say you're the one who comes out ahead.
Mistakes to Punish
Three specific Black replies are categorised as errors in this position. Both 4...Nb4 and 4...Nd4 are inaccuracies — each costs Black about half a pawn compared to the better 4...Nb8. The real blunder is 4...Qa5+, a mistake that loses nearly two pawns (around 1.8 pawns of advantage). If your opponent plays 4...Qa5+, they're putting the queen out early and begging you to gain time by developing with tempo. Your engine follow-up should leave them scrambling to catch up in development while you enjoy a near-decisive edge. Learn to spot these three moves and you'll convert your advantage into full points reliably.
Results across 350,987 Lichess games
| Most-played continuation | Games | White wins |
|---|---|---|
| Ne5 | 210,091 | 56.0% |
| Nb8 | 52,637 | 52.7% |
| Nb4 | 35,891 | 58.7% |
| Nd4 | 25,496 | 59.7% |
| Na5 | 12,996 | 57.0% |
| Qa5+ | 6,076 | 66.7% |
Frequently asked questions
Is 4.d5 good for White in the Sicilian Defense Open?
Yes, the position after 1.e4 c5 2.Nf3 Nc6 3.d4 d6 4.d5 gives White a clear, lasting advantage. Stockfish rates it +1.17, and White wins 56.6% of games from here with very few draws (4.1%).
What is the best move for Black after 4.d5?
The engine's top reply is 4...Nb8, retreating the knight all the way back. The planned continuation is Nb8 Bb5+ Nd7 e5, giving White strong development and centre pressure. Even so, White still scores 52.7% against this best defence.
What are the worst moves for Black in this position?
The biggest mistake is 4...Qa5+, which loses around 1.8 pawns of advantage. The inaccuracies 4...Nb4 and 4...Nd4 each lose about half a pawn. All three are worse than the engine's preferred 4...Nb8.
How should White respond to 4...Ne5?
4...Ne5 is the most popular Black move, seen in over 210,000 games. White scores 56.0% against it. The engine prefers 4...Nb8, so 4...Ne5 is already a slight concession — stay calm, defend your d5 pawn if needed, and continue developing with a comfortable edge.