Chessy
Sicilian: Four Knights: 6.Nxc6 — Black’s Guide
After the moves 1.e4 c5 2.Nf3 e6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 Nc6, White often plays 6.Nxc6, taking the knight and handing you a doubled c-pawn. At first glance it looks like a concession — your pawns are broken and your centre seems loose. But look closer: you have the bishop pair, active development, and a half-open d-file. In this lesson you’ll play Black and learn exactly how to handle the position that follows, including what to do when White grabs the queen trade and how to punish the common inaccuracies White falls for.
Play the Sicilian: Four Knights: Nxc6 against the engine
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Create a free account →What You’re Fighting For
The engine evaluates this position at +0.56, a small edge for White. That means you are slightly worse, but the gap is tiny — well within practical fighting range. Across nearly 5,000 real games, the results confirm it: White wins 47.8%, Black wins 44.1%, and draws are rare at 8.1%. Those numbers tell you this is a sharp, imbalanced fight, not a dull endgame. Your doubled c-pawns look ugly, but they give you the two bishops and a semi-open d-file where your rook will soon eye White’s queen (or king). You’re not trying to equalise with a single move — you’re steering the game toward a middlegame where your pair of bishops and active pieces outweigh the structural damage.
The Engine’s Best Move (and How to Answer It)
Stockfish’s first-choice move here is Qxd8+, continuing Qxd8+ Kxd8 Bf4 Ke8. The engine wants to remove queens early, denying you attacking chances, and then develop with Bf4 and e5 ideas. After queens come off, White hopes your king will be awkwardly placed on d8 or e8. But look at the Lichess stats: across 2,880 games where White played Qxd8+, White scored only 49.4% — essentially a coin flip. That means Black is holding his own. Your plan after Qxd8+ is to play Ke8 (as shown), aim for e5 or Bd6 to challenge White’s dark-square bishop, and develop your remaining pieces to active squares. The queen trade reduces randomness, but your bishop pair stays on the board ready to work.
The Most Common Mistake to Watch For
Many White players, especially at club level, avoid the queen swap and try something more aggressive. The statistics flag three clear inaccuracies: Bg5 (638 games, White scores 42.6%), Bd3 (501 games, White scores 54.9%), and Bc4 (127 games, White scores 39.4%). Each of these loses between roughly 0.6 and 0.8 pawns of advantage compared to Qxd8+. Your job as Black is to stay alert and punish these moves. Against Bg5, you can play h6 or develop with Bd6. Against Bd3 or Bc4, watch for tactics involving ...Ng4 or ...Qc7 followed by ...e5, activating your bishop pair. White’s inaccuracies usually come from trying to keep the queen on the board — and that’s exactly where your two bishops can shine.
When This Opening Suits You
The Sicilian Four Knights with Nxc6 is a great choice if you like clear, strategic battles without a thousand forced lines. You don’t need to memorise reams of theory; understanding the ideas behind the bishop pair, the d-file, and the central pawn break ...e5 will carry you far. It also suits players who are comfortable playing a hair worse at the start (that +0.56 edge) because they trust their pieces to outlast White’s. The statistics show Black scores well across the board — especially when White avoids the queen trade and gets punished. If you enjoy the French Defence or Queen’s Gambit Declined structures, you’ll feel at home with the solid pawn chain and piece play this line produces.
Results across 4,950 Lichess games
| Most-played continuation | Games | White wins |
|---|---|---|
| Qxd8+ | 2,880 | 49.4% |
| Bg5 | 638 | 42.6% |
| Bd3 | 501 | 54.9% |
| e5 | 475 | 42.3% |
| Bc4 | 127 | 39.4% |
| Be2 | 55 | 43.6% |
Frequently asked questions
Is 6.Nxc6 good for Black in the Sicilian Four Knights?
It’s perfectly playable. The engine gives White a tiny edge of +0.56, but the practical results are nearly even: Black wins 44.1% of games compared to White’s 47.8%. Your doubled c-pawns are offset by the two bishops and active piece play.
What is the best move for White after 6.Nxc6 dxc6?
The engine recommends Qxd8+, leading to an endgame-style position. White scores only 49.4% from that line, meaning Black handles it well. White’s other tries like Bg5, Bd3, or Bc4 are inaccuracies that you can punish.
Should I worry about my doubled c-pawns after 6.Nxc6?
Not too much. The doubled pawns give you the bishop pair and a semi-open d-file for your rook. They are a long-term concern but your short-term activity and piece coordination compensate for the structural weakness.
How should I play if White avoids the queen trade?
Be alert. Moves like Bg5, Bd3, and Bc4 are all inaccuracies (losing 0.6–0.8 pawns of advantage). Develop naturally, aim for ...e5 or ...Bd6, and look for active play with your bishops. The stats show White scores poorly with these moves.