Van Geet Opening: Grünfeld Defense — Black's Guide

Black's structure after 3...e5 is ambitious and principled. You've challenged White's knight on e4 directly, and you're asking White to prove that their centralised piece is more valuable than your space gains. If White retreats or flinches, you can take over the initiative. The statistics back this up: over 180,000 games, Black actually wins 49.4% of the time, compared to White's 46.2%. That's remarkable for a position where the engine gives White a narrow plus. The lesson is clear: club-level White players mishandle this position a lot, and your job is to know which replies to welcome and which one to respect.

Stockfish's top choice is 4.Bc4, developing with a threat. The engine's recommended follow-up is Bc4 f5 Nc3 Nc6 — Black pushes back the knight with tempo, then develops naturally. White scores 50.9% after Bc4 across nearly 28,000 games, so this is the line where you have to be most accurate. Your plan: meet Bc4 with 4...f5, hitting the knight and gaining space on the kingside. After Nc3, develop your knight to c6, and you'll have active play. White's bishop on c4 can be a target later, and your pawn on f5 gives you a grip in the centre. This is the theoretical test of your opening — practice it in the drill below.

The FACTS identify three inaccuracies White can make from this position, and all of them are good news for you: - 4.d3 loses about 0.8 pawns — a serious slip. White backs down instead of pressuring you. - 4.Nc3 loses about 0.7 pawns — retreating the knight to where it just came from is a waste of tempo. - 4.Ng3 also loses about 0.8 pawns — the knight goes to a passive square. Each of these gives you a free improvement. In fact, after 4.d3 White scores only 42.8%, and after 4.Nc3 just 44.4%. If your opponent plays any of these, you can be confident you've already outplayed them out of the opening.

The move you'll face most often is 4.Nf3, appearing in over 83,000 games — nearly half of all play from this position. White scores just 46.8% after Nf3, which is below their overall average. That's a statistical green light for Black. After 4.Nf3, you can continue developing naturally. The knight on f3 blocks White's f-pawn, making it harder for them to build a quick kingside attack. With the centre already somewhat fluid, your plan is straightforward: complete development (Nc6, Bc5 or Be7, short castle), and prepare to exploit White's slightly misplaced pieces. The engine's preferred Bc4 is much more testing, so if White plays Nf3 instead, you've dodged a bullet.