Facing the Grob Opening – Black's Best Response to 1.g4 Nf6

After 1.g4 Nf6 2.g5, White's pawn immediately attacks your knight. This is the whole point of the Grob: White chases your pieces around before you've finished developing. The most natural-looking retreats are surprisingly bad. The engine's preferred move is Nh5, retreating the knight to the edge of the board. That might feel ugly — knights belong in the centre, right? — but here it's the only move that keeps the position under control. The idea is simple: from h5 the knight can jump into f4 later, and you prepare to meet White's next move (likely e4) with ...g6, challenging the g5-pawn and opening lines for your bishop.

The Lichess database of 58,931 games shows what club players actually play, and the results are revealing. The most common move is Ne4 (24,126 games), where White scores 52.6%. That's playable but not ideal. The second most popular move, Nd5 (20,117 games), is an inaccuracy that loses about 0.8 pawns of advantage — the engine says Nh5 was better. Even worse are Ng4 (a mistake, losing ~1.7 pawns) and g6 (a mistake, losing ~2.6 pawns). Notice that White's scoring percentage actually goes up with every mistake you make: from 51.2% after Nd5 up to 58.2% after ...g6. Clearly, the board's edge is not a safe haven.

If you play the top move Nh5, the engine expects White to answer with e4, pushing in the centre. Your response should be ...g6, attacking the g5-pawn again. After White plays Nc3 defending it, you have a solid, playable position with clear plans: develop your kingside bishop to g7, castle short, and aim for ...d5 to challenge White's centre. The g5-pawn can become a target, and White's kingside pawn advance has left their own king exposed. Even though Stockfish gives +0.38 — a small edge for White — remember that this evaluation assumes perfect play on both sides. In practice, White's unusual setup gives you plenty of counterplay, and many Grob players don't know how to handle a principled defence.

Based on the engine analysis, there are clear loser moves in this position that you should delete from your memory. Nd5 is only an inaccuracy, so it won't lose immediately, but it gives White an easy game. Ng4 is worse — a mistake that loses about 1.7 pawns of advantage. The knight looks active on g4, but it can be kicked away by h3 or e4, and you've wasted time. Worst of all is g6, a mistake that costs you roughly 2.6 pawns. Players often try this to fianchetto quickly, but after 3.gxf6 gxf6, White has a healthy extra pawn and Black's kingside is wrecked. Stick with Nh5 and trust the engine.