Square One
    Opening Walkthrough
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    Opening Coach

    Polish Opening

    A00You play white
    1/5
    Your move

    The Sokolsky. You grab queenside space and, more importantly, clear the diagonal for the b2 bishop — the soul of this whole opening.

    Your line5 to go

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

    The Polish Diagonal

    1.b4 offers a pawn on move one. Take it, then kick the bishop that shows up — and 33% of the time the h8 rook is gone by move five.

    1.b4 is the Polish, and it looks like a mouse-slip. It is not. The pawn on b4 is bait; the bishop that follows it to b2 is the weapon, and it is already aiming at g7 and h8 before Black has moved twice. 18% of players eat the pawn, and grabbing it is objectively fine — the engine has Black better by 0.3 after the correct defence. The catch is that the correct defence is ONE idea, and 33% of the field plays the opposite of it: they attack the bishop instead of blocking it, and hand over a rook. Learn the difference between blocking a diagonal and kicking a piece and this opening prints material.

    The line, move by move

    1. b4 e5 2. Bb2 Bxb4 3. Bxe5 Nc6 4. Bxg7 Nf6 5. Bxh8

    1. 1. b4 (you) 1.b4. The Polish, sometimes called the Orangutan. You have put a pawn on a square Black can take, on move one, on purpose. 43% of the field answers 1...e5.

    2. 1... e5 (opponent) 1...e5 — the most popular reply at 43%. He plants a pawn in the centre and looks at your b4 pawn at the same time. Both of those are exactly what you want him thinking about.

    3. 2. Bb2 (you) Bb2. Trace the line with your eye: b2-c3-d4-e5-f6-g7-h8. That diagonal ends on his rook. Everything in this tree is a question of whether he blocks it or ignores it.

    4. 2... Bxb4 (opponent) …Bxb4 — 18% take. It is a real pawn and he is entitled to it. What he has also done is remove the only defender of e5, which is where your bishop is going next.

    5. 3. Bxe5 (you) Bxe5! Take back. Material is level and the position is honestly a touch better for HIM — the engine says -0.7 if he defends correctly. But look at what your bishop now sees: g7, and behind it a rook on h8 with a knight on g8 blocking its own escape. There is no …Rg8 in this position.

    6. 3... Nc6 (opponent) …Nc6 — 17%, and it is the single most natural move on the board. Develop a piece, hit the bishop, gain a tempo. Except the bishop does not have to move, and the square he needed to cover was f6, not e5. (…d6 and …Qe7 walk into exactly the same rook grab; together with this move that is a third of everyone.)

    7. 4. Bxg7 (you) Bxg7!! Do not retreat, do not defend — capture. 97% of White players find this, so trust it. His rook on h8 is attacked and it cannot run, because his own knight is sitting on g8 blocking the only flight square.

    8. 4... Nf6 (opponent) …Nf6 is his most common try at 24% — clear the g8 square so the rook can move next turn. He does not get a next turn.

    9. 5. Bxh8 (you) Bxh8! Rook, off the board, on move five. And no, the bishop is not buried — the h8-a1 diagonal it came in on is its way out; the engine's line is Bg7 and Bh6 a few moves later, or simply Bxf6 collecting the knight too.

    Every branch cashes out

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

    • Bxb4 / Nc6+7.3 by force

      +7.3 on move five, and every single thing he did was a normal chess move: take a free pawn, develop a knight, attack a bishop. That third move felt like a tempo. It cost a rook. Name it once and you will never lose to it — and you will win with it constantly.

    • Bxb4 / Nf6Sound line

      -0.3 — dead level in practice, and this is the RIGHT answer to 3...Nf6. Knowing that the trap is switched off is worth as much as the trap itself: 38% of players find this move, and playing Bxg7 into it is not even legal.

    • Bxb4 / f6Sound line

      +0.1 with a developed knight, an intact pawn centre and a black king that has punched holes around f6. Level on the board, easier to play by a mile — and the whole edge came from picking c3 over b2 and knight over pawn.

    • Bxb4 / Qg5Sound line

      +1.0 and a clean extra pawn. His queen defended g7 beautifully and forgot the other end of the same bishop's diagonal — that is what happens when a queen does a job a minor piece should be doing.

    • Nc6Sound line

      +0.8 — material dead level, and you own the only open diagonal on the board. The b-pawn was never really a gambit; it was a lever, and it dragged his best-placed knight to the edge of the board to collect it.

    • d6Sound line

      -1.0 and completely playable — a real centre, an open e-file and the bishop pointing at g7 with the diagonal clear. Against the most popular reply in the Polish you do not get a rook, you get a game. Knowing which of Black's answers is which is the entire skill of this opening.

    Why it works

    The Polish works because it looks like it should not. 1.b4 reads as a mouse-slip, and the pawn is genuinely takeable: 18 percent take it, and the engine says grabbing it is objectively fine. The real weapon is the bishop that follows to b2, aiming down the longest diagonal on the board, b2 through g7 to h8, before Black has moved twice. After 1...e5 2.Bb2 Bxb4 3.Bxe5 the bishop stands in the center staring at g7, and the detail that decides everything is structural: Black's own knight on g8 is blocking the h8 rook's only escape square. There is no ...Rg8 in the position.

    The trap is a category error, and it is the most natural error in chess. The only defense that works is putting something on f6 to block the diagonal. Instead, a third of the field attacks the bishop: ...Nc6 (17 percent), ...d6 (11 percent), ...Qe7 (5 percent), all developing moves, all hitting the e5 bishop, all ignoring f6. Against any of them White simply plays Bxg7, the rook cannot run, and Bxh8 collects it on move five at +7.3. Attacking a piece feels like gaining a tempo. Blocking a diagonal actually is one. The whole opening is the difference between those two sentences.

    And the bishop is not trapped in the corner afterward, which is the objection everyone raises. The diagonal it came in on is its way out: the engine's own line brings it back through g7 and h6, or it just takes on f6 and collects the knight too.

    How to punish the Polish Opening

    Punishing the Polish starts with taking the pawn without apology. The engine has Black slightly better after the correct follow-up, and the correct follow-up is one idea: after 3.Bxe5, put a piece on f6. 3...Nf6 is the main move at 38 percent, and it does not defend g7 so much as occupy the road to it; Bxg7 becomes physically illegal with the knight standing on the diagonal. From there Black just plays chess with a comfortable game, and the tree's own line ends level at -0.3 with the trap permanently switched off.

    If you prefer not to enter the theory at all, the most popular reply in the whole opening is also the soundest: 1...e5 followed by ...d6, propping the center and keeping g7 covered by the f8 bishop. The tree is honest about what that does to White: -1.0 with no trap available anywhere. The Polish player is betting you do not know which defense is which; knowing it flips the whole opening.

    How to avoid falling into it

    From the White side, the losing habit is believing your own trap when it is not there. Against 3...Nf6 there is nothing to take on g7 and pretending otherwise loses the game; the tree's move is the modest c3, measurably best at -0.3 while a3 and Nf3 both drift to -1.2. Against 2...Nc6, taking on e5 is a straight blunder at -4.7 because the knight just captures the bishop. And against ...Qg5, the clever sideways defense of g7, Bxg7 hands the bishop back at -4.3. The trap fires on exactly three careless moves and no others.

    The quieter discipline is in the small recaptures, where the tree measures real gaps. When ...f6 blocks the diagonal, retreat the bishop to c3, not b2: six tenths of a pawn between them. When the bishops come off on c3, recapture with the knight, not the d-pawn: nine tenths. The Polish gives up a little ground on move one, and these are the moves that earn it back.

    Questions people actually ask

    Is the Polish Opening (1.b4) any good?
    Objectively it concedes a little: against the most popular and soundest reply the tree reads -1.0 for White, and even the trap line is slightly better for Black with correct defense. Practically it is a material printer at club level: a third of the field meets 3.Bxe5 by attacking the bishop instead of blocking the diagonal, and that mistake costs a whole rook.
    Should you take the b4 pawn against the Polish?
    Yes. The engine says the grab is objectively fine and Black is slightly better after the correct follow-up. The catch is that the correct follow-up is exactly one idea, a piece on f6, and 33 percent of players do the opposite. Take the pawn, then play 3...Nf6, and the trap is off.
    How does the Polish Opening trap work?
    After 1.b4 e5 2.Bb2 Bxb4 3.Bxe5, the bishop attacks g7 with the h8 rook behind it, and Black's own g8 knight blocks the rook's only escape. Any move that attacks the bishop instead of blocking the diagonal, ...Nc6, ...d6, or ...Qe7, loses to Bxg7 followed by Bxh8: a rook on move five, measured at +7.3.
    What if Black declines the pawn?
    Then the b-pawn changes jobs. Against 2...Nc6 it advances to b5 and kicks the defender of e5 off its square, and White emerges at +0.8 owning the long diagonal. Against the solid 2...d6 there is no trick at all: White builds with c4 and e3, accepts a small deficit, and plays a real game. The tree says so plainly: no trap, just chess.
    Is the bishop trapped after taking on h8?
    No. The a1 to h8 diagonal it captured along is also its exit: the engine's line walks it back out via g7 and h6, or it takes the f6 knight on the way home. Black gets no compensation for the rook, which is why the tree stamps the position at +7.3.

    Drill the Polish Opening against a real opponent

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