Square One
    Opening Walkthrough
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    Opening Coach

    Grob Opening

    A00You play white
    1/3
    Your move

    The Grob. One pawn lurch — it weakens your king and grabs no center, so know the deal: you're not playing for an advantage, you're playing for the ambush. The point is the diagonal you're about to open.

    Your line3 to go

    Play the moves — your line builds here as you go.

    The Grob

    1.g4 is the worst first move in chess — and it robs a rook by move five, because 40% of players send the wrong bishop to collect the free pawn.

    Let's be honest before anything else: Stockfish rates 1.g4 at -1.9 for White. It is the worst first move on the board and no amount of coaching changes that. Now the other number — across 8.87 million games between 1000 and 1600, White scores 49.7% with 1.g4, against 51.7% for 1.e4. Two points. That gap exists because 1.g4 is not really a pawn push, it is bait: the moment Black's c8 bishop leaves home to eat it, the b7 pawn and the a8 rook have no defender left, and your bishop on g2 is already pointed at both. One pawn on d5 is in the way — so you attack it with c4 and let him remove it himself. Take the honest engine number with you, and take the rook too.

    The line, move by move

    1. g4 d5 2. Bg2 Bxg4 3. c4 dxc4 4. Bxb7 Nd7 5. Bxa8

    1. 1. g4 (you) g4. The engine's verdict is -1.9 and it is right — you have weakened your king and developed nothing. Play it anyway, knowing exactly what you are buying: a pawn sitting on a square Black's bishop wants, on a diagonal his bishop is currently guarding.

    2. 1... d5 (opponent) …d5, 33%. He takes the centre, and in the same move he opens c8-d7-e6-f5-g4 for his bishop. Your g-pawn is now attacked by that bishop and defended by absolutely nothing.

    3. 2. Bg2 (you) Bg2, 68%. It looks like you are propping the g-pawn up. You are not — Bg2 does not defend g4 and it never will. This bishop has exactly one job in this opening and the address is a8.

    4. 2... Bxg4 (opponent) …Bxg4, 40% — the single most popular move in the position, and why not, the pawn was free. But look at what just left c8. Nothing defends b7 anymore. Nothing defends a8 anymore. His bishop has swapped guard duty for one pawn.

    5. 3. c4 (you) c4! 89% of Grob players find this and it is the entire idea. Your bishop on g2 is aimed at b7 and precisely one thing blocks it: his pawn on d5. So attack that pawn with a pawn he would love to win. From here White scores 57.6% across 712,415 games.

    6. 3... dxc4 (opponent) …dxc4 — only 10% take, and every one of them just unlocked the door. d5 is empty. g2 to a8 is one clean diagonal with a loose pawn and a loose rook standing on it, because the piece that used to guard them is sitting on g4 holding a pawn.

    7. 4. Bxb7 (you) Bxb7! 85% play it. Free pawn, and the rook on a8 is attacked with nothing defending it. This exact position has been reached 62,265 times in this rating band and White wins 58.0% of them outright — the best number anywhere in the Grob.

    8. 4... Nd7 (opponent) …Nd7, 54% — and it is genuinely the best move. The knight steps off b8, which opens d8-c8-b8-a8 for his queen. He is handing you the rook and buying your bishop back with it.

    9. 5. Bxa8 (you) Bxa8! 97% take, and so should you. His queen collects the bishop next move and the trade is done: your bishop for his rook and his b-pawn.

    Every branch cashes out

    7 coached branches in this family. Engine-checked finishes:

    • d5 / dxc4 / Nd7Sound line

      Now count it honestly. Bishop for rook-plus-pawn is +3, minus the two pawns you gave away on g4 and c4 — you finish exactly ONE pawn ahead, and Stockfish still has you at -1.8 here. That is the Grob in a single line: you win the exchange and the machine shrugs, because your king has no cover and he holds both bishops. Humans do not shrug. This is the position White wins 58% of.

    • d5 / dxc4 / c6+4.3 by force

      +4.3 — a rook for one pawn, five moves into the worst opening in chess. The whole difference between this and the 54% line is one square: he needed the knight OFF b8 so the queen could reach a8, and instead he blocked the diagonal the rook was already dead on.

    • d5 / dxc4 / Nc6+5.2 by force

      +5.2. After he recaptures you are four points of material up — a rook for a pawn, near enough. The check is the entire trick: Bxc6+ wins a piece and keeps a8 attacked in the SAME move, so blocking on d7 answers the wrong threat.

    • d5 / c6Sound line

      +0.4 — dead level, out of an opening the engine hates by two pawns. You are a pawn up, the light-squared bishops are gone, his king is still on e8 and his rook is babysitting a8 on move eight. His most popular defence to the Grob hands you the best position in this entire tree. The traps are a bonus.

    • d5 / Nf6Sound line

      -1.3, material dead level, his king still on e8 and his rook still nailed to a8. No trap in this one — just the Grob's actual plan doing its actual job: everything in this opening exists to put a white piece on b7.

    • e5 / dxc4Sound line

      -0.5, a pawn to the good, and the discipline IS the lesson: that rook sat there hanging for two full moves and taking it would have lost the game. He owns both bishops and you own the only pawn — from -1.9 on move one to -0.5 on move seven is the best trade the Grob offers you.

    • e5 / Bxg4+13.1 by force

      +13.1 — a queen for a pawn on move five, in an opening the computer says you should be losing. He took one free pawn on g4, then took the wrong one on d5, and the second grab was the only move in the position that hangs his queen to a bishop which had been pointing at that square since move two.

    Why it works

    Start with the honest number: Stockfish rates 1.g4 at -1.9, the worst first move on the board. Now the number that keeps the Grob alive: across 8.87 million club games, White scores 49.7 percent with it, against 51.7 percent for 1.e4. Two points of practical difference for two pawns of engine evaluation, because 1.g4 is not really a pawn push. It is bait for the c8 bishop. The moment ...Bxg4 happens, b7 and a8 have no defender left, and the bishop that went to g2 is already aimed at both.

    One pawn stands in the way, on d5, so White attacks it with c4 and invites Black to remove the cork himself. The scoreboard tracks the plan step by step: after 3.c4 White scores 57.6 percent across 712,415 games, and the ambush position after ...dxc4 and Bxb7 has been reached 62,265 times in this band, with White winning 58 percent of them outright, the best number anywhere in the Grob. From there everything turns on one question: can Black's queen reach a8? Only a knight stepping off b8 opens her road, which is why the natural looking ...c6 loses a whole rook at +4.3 while the humble ...Nd7 saves it.

    There is also a queen in the deal. In the ...e5 move order, once the bishop has taken on g4 and White trades on d5, the recapture ...Qxd5 hangs the queen to Bxd5, the bishop that has been pointing at that square since move two. Only 2 percent of players grab it, 462 games out of 21,836, and every one of them lost a queen for a pawn on the spot, measured at +13.1.

    How to punish the Grob Opening

    The Grob is refuted by declining the conversation. Stockfish hands Black a two pawn evaluation on move one; the whole job is not giving it back. Keep the c8 bishop home, or if you do collect the g4 pawn, refuse everything after it: only 10 percent of players take the c4 bait, and they are the ones who get robbed. Propping d5 with ...c6 keeps the long diagonal corked and there is no ambush at all; even the tree's best line for White against it claws back to just +0.4 after eight accurate moves.

    If the ambush does land, the correct defence is ...Nd7: it clears b8 so the queen finally covers a8, and 54 percent of players find it. White's haul shrinks to bishop for rook and pawn, and Stockfish still scores the position -1.8 in Black's favour, because White's king has no cover and Black holds both bishops. Be warned that humans convert that position 58 percent of the time for White anyway, so the cleaner answer remains never opening the diagonal in the first place.

    How to avoid falling into it

    Two grabs arm the trap and a third springs it. The first is ...Bxg4: the pawn really is free, but the bishop was the only piece guarding b7 and a8, and 40 percent of players take without noticing what just went off guard duty. The second is ...dxc4, which removes the last blocker from the g2 bishop's diagonal. If you have played both, the rook is already in danger and only a knight move off b8 saves it: ...Nd7, not ...c6, because blocking the diagonal does nothing while your own knight seals the queen out of the corner.

    And treat the d5 pawn as poisoned once a white bishop sits on g2 behind it. ...Qxd5 is the one move on the board that loses instantly; ...Nf6 attacks the same pawn with a piece instead, keeps material level, and leaves the engine at -1.0 in your favour. The Grob only ever beats people who take everything it offers.

    Questions people actually ask

    Is the Grob a good opening?
    No, and this walkthrough says so in its first breath: Stockfish scores 1.g4 at -1.9, the worst legal first move. The practical case is that across 8.87 million games at 1000 to 1600, White still scores 49.7 percent, only two points behind 1.e4, because the punishing grabs are exactly the moves club players love making. Play it with open eyes or not at all.
    What is the main trap in the Grob?
    The b7 robbery. Black's bishop takes the free g4 pawn, which strips the only defender from b7 and a8. White plays c4 to pull the d5 pawn off the long diagonal, then Bxb7 hits the rook. If Black's knight is still on b8 his queen cannot reach a8, and the rook is lost outright: +4.3 when he blocks with ...c6, +5.2 when Bxc6+ picks up a knight on the way.
    How do you beat the Grob?
    Decline the bait. Keep the c8 bishop home, and once you have taken on g4, take nothing else: not the c4 pawn, and never the d5 pawn with your queen. If Bxb7 lands anyway, play ...Nd7 so your queen covers a8. White's best case against the solid ...c6 defence is +0.4, effectively level, and he needs eight accurate moves to earn even that.
    Why does the Grob score almost as well as 1.e4 if the engine hates it?
    Because the losing moves are the natural ones. In the main line 40 percent of players grab the g pawn, and the c4 bait, the poisoned d5 pawn and the naked b7 square each convert a slice of the rest. The Lichess numbers climb with every stage of the plan: 49.7 percent overall, 57.6 percent after 3.c4, 59.6 percent once the bishop lands on b7.
    What happens if Black declines everything?
    White gets a worse but playable game, and the tree is honest about which branches those are. Against ...c6 the plan trades on d5 and raids b7 with the queen, ending a pawn up at +0.4; against plain ...Nf6 development the same queen raid squares the material and the engine still reads -1.3. The Grob without the robbery is a bad opening played with a straight face.

    Drill the Grob Opening against a real opponent

    The trainer above plays every branch with a coach explaining each move. When you are ready, take it into a live game, or paste your Chess.com or Lichess username and see which openings actually cost you rating.

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