The West Indian Defense: Nf3 – Your Guide as Black

The position after 3...Bg7 is a tabiya of the King's Indian complex. You've committed to a fianchettoed dark-squared bishop that stares down the long h8-a1 diagonal. White has played Nf3 instead of Nc3 so far, keeping their options open. Your core fight is for the d5-square and the centre. Black's most common plan is to challenge White's centre immediately with d5, leading to a Grünfeld-like structure after Nc3 d5 cxd5 Nxd5. If White avoids Nc3 (for example with e3 or g3), you can often seize space with c5 or even e5 on the next move. The engine's best reply is Nc3, which scores only 48.4% for White in practice — meaning you get excellent fighting chances even against the top choice.

From this position, here is how the most-played White replies score, with Black's practical chances right after each one. Remember, you are Black in every case so the White score tells you how well you are doing against it — the lower White's score, the better for you. - Nc3 (1.5M games, White scores 48.4%): A natural developing move preparing d5. Your most solid response is 4...d5, entering a Grünfeld. - e3 (343k games, White scores 44.9%): This is a wonderful sign for you — White scores below 45%, meaning you are already slightly favoured in practice. Develop with 4...0-0 or 4...d5, and enjoy the game. - g3 (290k games, White scores 50.5%): A Catalan-style setup where White scores above 50%. Be precise and consider 4...d5 or 4...0-0 followed by c5. - Bg5 (206k games, White scores 47.2%): Surprisingly, this is actually an inaccuracy — it loses about 0.7 pawns of advantage. Punish it with accurate play (often 4...d5). - Bf4 (121k games, White scores 46.2%): Another decent outcome for you. Develop naturally with 4...0-0 or 4...d5. - e4 (38k games, White scores 43.4%): This is a clear inaccuracy losing about 1.0 pawns. Black can reply 4...d5 with a comfortable game.

The statistics and engine evaluation agree that two White moves in this position are genuine inaccuracies. Knowing them will help you capitalise when your opponent slips. Bg5 loses roughly 0.7 pawns compared to the best move. White's idea is to pin the knight, but your fianchettoed bishop on g7 makes it less effective. If you see Bg5, you can play 4...d5 confidently — the bishop on g5 can become a target later. e4 loses roughly 1.0 pawns and is an even worse mistake. White tries to seize the centre, but they've neglected development and weakened the d4-square. Your reply 4...d5 challenges the centre directly; after cxd5 Nxd5 White's e4 pawn is weak and your knight is active. Both of these inaccuracies give you a chance to convert the engine's +0.26 edge into a very comfortable position.

The top engine pick is Nc3, appearing in over 1.5 million games — more than all other moves combined. Against Nc3, the engine recommends continuing 4...d5 5.cxd5 Nxd5, reaching a classic Grünfeld structure. Here White has a small theoretical edge (+0.26), but the practical results are nearly dead even (White wins 48.4%, Black wins an almost identical percentage). Your plan in this structure: complete development with 0-0, play c5 to challenge White's centre, and use your fianchettoed bishop to pressure the queenside and centre. The trade of your d-pawn for White's c-pawn gives you dynamic counterplay. Because the drill adapts to your play, you can experiment with both 4...d5 and other solid replies (like 4...0-0) and see how the engine responds.