Chessy
Mastering the Anti-Nimzo-Indian: b6 as White
After 1.d4 Nf6 2.c4 e6 3.Nf3 b6, White plays the quiet but useful 4.a3 — the Anti-Nimzo-Indian. You've prevented Black from pinning your knight with ...Bb4, and now you wait to see how Black develops. The engine evaluates the position at +0.31, a small edge for you. Across 28,525 games on Lichess, White scores 50.4% (with just 4.2% draws), meaning this modest advantage converts into wins more often than not. Let's see how to make that small edge count.
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An evaluation of +0.31 is not a knockout punch — it's a nudge. Black's position is solid but slightly passive. Your main trump is the space advantage you already enjoy from the pawn duo on d4 and c4. Black's ...b6 signals a desire to fianchetto the light-squared bishop, but it doesn't challenge your centre directly. In practical play, that 50.4% White win rate (against 45.5% for Black) shows that you're more likely to outplay your opponent from here than the other way around. The key is to develop naturally, keep your centre intact, and look for a timely e2-e4 break when Black's pieces are not well coordinated.
The Engine's Best Continuation
Stockfish's suggestion is straightforward and instructive. After 4.a3, Black's best move is Bb7, and the recommended line continues: 5.Bf4 Be7 6.Nc3. Let's break that down for you as White: you develop your dark-squared bishop to an active diagonal (f4), Black replies with the solid Be7, and you bring your knight to c3, completing the classic queen's pawn setup. Notice that you haven't committed your king's bishop yet — keeping the option of e2-e3, g3, or even Bg5 later. This flexible development keeps Black guessing while you solidify your centre. If Black plays something else on move 4, you'll need a different plan — and statistics show exactly what's coming next.
What the Numbers Reveal About Black's Replies
Black's most popular move is Bb7 (23,757 games), where White scores a solid 50.0%. That's your baseline. But look at what happens when Black tries something else: - Ba6 (1,553 games): White scores 48.6% — still okay, but Black's idea of pressuring your c4-pawn can be annoying. - c5 (931 games): White scores 52.4%. This is Black's most direct try to challenge your centre. - d5 (774 games): White scores 53.0% — Black enters Queen's Gambit territory, but you've already played a3, which is slightly pointless there. - Be7 (673 games): White scores 53.3% — Black's best score comes from fianchettoing, not from this immediate development. The numbers suggest you can be confident against any choice, but the sharpest replies (c5, d5) give you the highest winning percentages.
The One Mistake You Can Punish
Here's a concrete takeaway: according to the data, c5 is an inaccuracy that loses about 0.6 pawns for Black — the engine says Black should have played Bb7 instead. If your opponent plays 4...c5, you can be happy. Black is trying to break open the centre, but you have a comfortable response. Develop naturally: maybe 5.d5 (gaining space and closing the centre) or simply 5.e3 and then meet ...cxd4 with exd4, keeping a strong pawn centre. The 0.6-pawn loss means Black will feel the squeeze soon — your space advantage becomes more pronounced, and Black's ...b6 loses some of its point if the centre gets blocked or simplified. Keep an eye out for this mistake and make Black pay for it.
Results across 28,525 Lichess games
| Most-played continuation | Games | White wins |
|---|---|---|
| Bb7 | 23,757 | 50.0% |
| Ba6 | 1,553 | 48.6% |
| c5 | 931 | 52.4% |
| d5 | 774 | 53.0% |
| Be7 | 673 | 53.3% |
| a5 | 247 | 52.6% |
Frequently asked questions
Is the Anti-Nimzo-Indian: b6 a good opening for beginners?
Yes. The position after 4.a3 is low on immediate tactics and high on strategic ideas. You get a small edge (+0.31) with simple development. The 50.4% White win rate shows it's practical, and the low drawing percentage (4.2%) means you'll often get a fighting middlegame that rewards understanding over memorisation.
What if Black plays Ba6 on move 4?
Black's Ba6 (1,553 games) tries to pressure your c4-pawn. White scores 48.6% here — slightly lower than average, but still competitive. Your simplest plan is to protect c4 with b3 or Qc2, then continue developing. Don't panic: Black's bishop on a6 is slightly misplaced and may have to retreat later.
Should I always play 4.a3 against the b6 system?
4.a3 is a solid, flexible move that prevents ...Bb4 and keeps your options open. The engine gives it a small edge (+0.31). However, it's not the only good move — many players prefer 4.g3 or 4.Nc3. What 4.a3 offers is a simple, low-risk way to reach a position where you outscore your opponent in practice.
Why does White score better against c5 (52.4%) than against Bb7 (50.0%)?
Even though c5 is theoretically an inaccuracy, it leads to sharper play where your space advantage matters more. Black's 52.4% loss rate in those games suggests that club players mishandle the resulting positions more often than against the solid Bb7 line. If you know how to respond, you can convert that 0.6-pawn edge into a full point.
How many games feature the Indian Defense: Anti-Nimzo-Indian: b6?
Over 28K Lichess games have reached the Indian Defense: Anti-Nimzo-Indian: b6 position. White wins 50.4%, Black wins 45.5%, with 4.2% draws — based on real rated games.