Chessy
How to Punish the Grob Opening: b6 as Black
You've just seen 1.g4 — the Grob Opening. It looks weird, and your instinct might be to lash out immediately. The good news: you're not worse. Stockfish evaluates the position after 1.g4 b6 2.Bg2 at +0.12, which is essentially dead level. Neither side is better out of the opening. But you need to choose the right reply, because some natural-looking moves are actually blunders. Let's look at the statistics from over 182,000 games and find the surest way to equalise — or better — as Black.
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With 1.g4, White weakens the kingside early and gambits a pawn for questionable compensation. Your move 1...b6 prepares to fianchetto your own bishop and fight for the centre. After 2.Bg2, you're in a position where White wins 51.6% of games, draws happen only 3.5% of the time, and Black wins 44.8%. That 51.6% White win rate is inflated by weaker players not knowing how to respond — it's not because White is better. The engine says +0.12, a tiny edge for White that's practically zero. Your job is to pick the reply that keeps it that way and gives White nothing for free.
The Best Reply: Nc6
The engine's top choice is Nc6, played in 100,582 of the 182,075 games in the database — over half of all games. From there, the suggested continuation is Nc6 d4 d5 c4, and Black is perfectly fine. The most impressive stat: when Black plays Nc6 here, White scores just 47.0%. That means Black actually outscores White from this position, flipping the overall 51.6% White win rate in your favour. Nc6 develops a piece, eyes the centre, and doesn't commit your pawns prematurely. It's the most principled, most successful move you can make.
The Three Blunders to Avoid
Three moves that look reasonable are actually losing. The database identifies them as clear blunders, all because Nc6 was better. Bb7 (19,218 games) loses roughly 5.0 pawns — the fianchetto looks natural but here it drops material after White's reply. e6 (348 games, White scores 70.7%) and g6 (482 games, White scores 70.1%) each give White a winning advantage. The common thread: they're too passive or misplace pieces when you need simple development. White's g4-Bg2 setup is aimed at your kingside, and careless fianchetto moves let White's bishop become a monster. Stick to Nc6 and you'll be fine. If you see your opponent play Bb7 or e6, punish them.
What to Expect After Nc6 d4
The most common follow-up from the best line: after 1.g4 b6 2.Bg2 Nc6, White usually plays 3.d4, fighting for the centre. You answer with 3...d5, also claiming space. White's 4.c4 is a standard central pawn break. At this point you've reached a solid, open position where your pieces develop naturally. White's g4 pawn is a long-term weakness, not a threat. Your development is straightforward: aim to castle kingside (White's g4 actually makes your kingside safer), develop your dark-squared bishop to b7 or something active, and get your rooks into play. The engine sees Black as fully equal here — the opening did its job.
Results across 182,075 Lichess games
| Most-played continuation | Games | White wins |
|---|---|---|
| Nc6 | 100,582 | 47.0% |
| c6 | 48,623 | 50.2% |
| Bb7 | 19,218 | 78.4% |
| d5 | 11,388 | 49.0% |
| g6 | 482 | 70.1% |
| e6 | 348 | 70.7% |
Frequently asked questions
Is the Grob Opening: b6 a good opening for Black?
Yes, it's perfectly fine for Black. Stockfish rates the position after 1.g4 b6 2.Bg2 at +0.12, essentially dead level. Black's best move is Nc6, and in those games Black actually outscores White (White wins only 47.0%). Avoid the blunders Bb7, e6, and g6, and you'll be equal or better.
What is the engine's best move against 1.g4 b6 2.Bg2?
The engine recommends Nc6. From there the continuation is Nc6 d4 d5 c4. This leads to a solid, equal position where Black has good central control and development. It's also the most popular move in the Lichess database, played over 100,000 times.
Why is Bb7 a blunder in the Grob b6?
Bb7 loses roughly 5.0 pawns according to the engine. While fianchettoing the dark-squared bishop is thematic in ...b6 systems, the position after 1.g4 b6 2.Bg2 makes this a serious mistake. White's setup punishes the passive development, and the engine says Nc6 was much better.
What happens if Black plays g6 against the Grob b6?
Playing g6 is a blunder that loses about 3.6 pawns. White scores 70.1% in those games, meaning you're giving away a winning chance. The move weakens your kingside and doesn't address the centre. Stick to Nc6 for a clean, equal game.
How many games feature the Grob Opening: b6?
Over 182K Lichess games have reached the Grob Opening: b6 position. White wins 51.6%, Black wins 44.8%, with 3.5% draws — based on real rated games.