Square One
    Opening Walkthrough
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    Opening Coach

    Bishop's Opening

    C23You play white
    1/3
    Your move

    Stake the center and open the lines for your bishop and queen. Everything starts here.

    Your line3 to go

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

    The Bishop's Opening — Legal's Mate With No Setup

    You have seen this checkmate before. Here it arrives a move earlier, and 52% of players walk into it.

    2.Bc4 puts the bishop out before the knight, and that single change rewrites Legal's Mate. In the Italian you had to spend a move on h3 first, because Black's knight sat on c6 guarding e5 twice. In the Bishop's Opening he usually never plays ...Nc6 at all — so you offer the queen immediately and mate on move seven. The entire tree runs on one question you ask before every sacrifice: does anything cover d5? When the answer is no, Nxe5 measures +185 and half the board takes the queen. When the answer is yes, the exact same move measures -683. Learn the question, and you own both versions of the trap: the one that needs h3, and the one that does not.

    The line, move by move

    1. e4 e5 2. Bc4 d6 3. Nf3 Bg4 4. Nc3 h6 5. Nxe5 Bxd1 6. Bxf7+ Ke7 7. Nd5#

    1. 1. e4 (you) Standard opening move. Nothing to see yet.

    2. 1... e5 (opponent) He copies. Almost everyone does.

    3. 2. Bc4 (you) Bc4 on move two. Most players reach this bishop position via the Italian a move later; going straight there leaves your knight uncommitted and already aims at f7, the square every trap in this file ends on.

    4. 2... d6 (opponent) ...d6 — 10% of 115 million games from this position. He braces e5 with a pawn and frees his light-squared bishop. Both of those become liabilities within four moves.

    5. 3. Nf3 (you) Nf3, hitting e5. Note what is holding that pawn up now: one pawn on d6, and nothing else. Keep counting the defenders of e5 — it is the number this whole opening is about.

    6. 3... Bg4 (opponent) ...Bg4 — 21% play it, the second-most popular move he has. He pins your knight against your queen and assumes the knight is now frozen. What he has actually done is park a bishop one diagonal hop from your queen, where taking her will feel impossible to resist.

    7. 4. Nc3 (you) Nc3. It looks like the most ordinary move in chess and it is the most important one in the tree: from c3 the knight reaches d5 in one hop, and d5 is the square the checkmate happens on. Play it and then look at what he does about d5.

    8. 4... h6 (opponent) ...h6 — only 4% play it here, and it is the purest example of the whole idea: a move that stops nothing, guards nothing, and does not touch d5. (...a6 and ...g6 are the same story, same result.) Count his pieces covering d5 right now. Zero.

    9. 5. Nxe5 (you) Nxe5!! Take the pawn and walk straight through the pin — his bishop on g4 can capture your queen, and you want him to. Measured at +185, and this is Legal's Mate arriving WITHOUT the h3 you needed in the Italian, purely because there is no black knight on c6.

    10. 5... Bxd1 (opponent) ...Bxd1. 52% take the queen — more than half of sixty thousand games. It is the most natural capture on the board and it ends the game immediately.

    11. 6. Bxf7+ (you) Bxf7+! Bishop takes pawn with check, and do not bother calculating his options — he has one. Kxf7 is illegal because your knight on e5 defends f7, d7 is covered by the same knight, and d8 and f8 are blocked by his own queen and bishop.

    12. 6... Ke7 (opponent) Forced. Not "most people play this" — the position has one legal move and this is it.

    13. 7. Nd5# (you) Nd5#! The knight you developed on move four delivers mate. e6 and e8 belong to the bishop on f7, d7 and f7 to the knight on e5, f6 to this knight, d8 and f8 to his own pieces — and the pawn on e4 defends d5, so the king cannot take it. Move seven.

    Every branch cashes out

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

    • h6 / Bxd1Forced mate

      Checkmate on move seven, and every move he made was reasonable until the last one. He pinned, you offered the queen, and 52% of humans take it. A queen is worth nine points; a checkmate is worth the game — that trade is the entire Bishop's Opening in one line.

    • h6 / dxe5Sound line

      +1.9 — a pawn up on move six with his kingside stripped and zero pieces out. The half of the room that DECLINES still hands you a better position than most openings deliver by move twelve. This trap has no downside.

    • Nc6 / Bh5 / Bxd1Forced mate

      The same checkmate you learned three minutes ago, from a position that needed one preparatory move first — and 34% of 84,000 players still grabbed the queen. Spotting one pattern through two different move orders is the skill; the mate is just the receipt.

    • Nc6 / Bh5 / Nxe5Sound line

      +1.7. Even his best answer costs a pawn, because h3 turned his bishop into a target three moves before you cashed it in. Preparation that wins material when the trap FAILS is the kind worth memorising.

    • Nc6 / Bxf3Sound line

      +0.5 with the bishop pair and nothing to regret. He found the move that saves him, and it cost him his best minor piece to find it. The trap collects rent even when it does not spring.

    • Nf6Sound line

      +0.7, the bishop pair, and no queen thrown away — which IS the win here. His most common move is the one that guards d5, so the most common outcome in this whole tree is you correctly not firing. Knowing when to hold the sacrifice is worth exactly as much as knowing when to play it.

    • Bxf3Sound line

      +0.8 on move five, two bishops against bishop and knight, and a queen already sitting on an active square. He handed you a permanent structural edge to avoid a trap you had not set yet.

    Why it works

    The Bishop's Opening is Legal's Mate with the setup move deleted. In the Italian, the queen sacrifice needs h3 inserted first, because Black's knight on c6 guards e5 twice. Play 2.Bc4 instead of 2.Nf3 and Black usually never puts a knight on c6 at all: he braces e5 with ...d6, pins your knight with ...Bg4, and assumes the pin freezes everything. It does not. Nc3 arrives looking like the most ordinary move in chess, and it is the mating piece: from c3 the knight reaches d5 in one hop, and d5 is the square the checkmate lands on.

    The whole tree runs on one measured question: does anything cover d5? When the answer is no, as after the waiting move ...h6, the sacrifice Nxe5 evaluates at +185 even though it hangs the queen on purpose. 52 percent of players take her, more than half of sixty thousand real games, and the punishment is exact: Bxf7+ leaves Black with literally one legal move (chess.js confirms it), and Nd5 is checkmate on move seven. When the answer is yes, the identical move is a disaster: -288 against ...Nc6, -621 against ...c6, -683 against ...Nf6. Same square, same piece, a nine-point swing on one defender.

    The trap has no downside branch. When Black smells the sacrifice and declines with ...dxe5, the queen simply collects the loose bishop on g4 and White is a clean pawn up at +1.9. When Black plays ...Nc6 and forces the Italian version, h3 asks the bishop the question, and even the correct recapture lines leave White +1.7 or holding the bishop pair at +0.5. The sacrifice wins games; the preparation wins material even when the sacrifice never fires.

    How to punish the Bishop's Opening

    Facing the Bishop's Opening, the anti-trap move is the natural one: ...Nf6. It is Black's most popular reply in the tree at 25 percent, and it works for a precise reason, the knight covers d5, the square every mating line needs. With d5 guarded, Nxe5 flips from +1.9 to -6.8 in White's own measurements: after ...Bxd1, the follow-up Nd5+ just gets captured and White has donated a queen for two pawns.

    More generally, do not meet Bc4 systems with pins you are not ready to maintain. The ...Bg4 pin is the bait that makes every branch of this file possible, and cashing it in early with ...Bxf3 concedes only the bishop pair, around half a pawn in the tree's evals, instead of a king. A slightly worse but solid position is the correct price for defusing a mating attack.

    How to avoid falling into it

    From the White side, the way to lose with this opening is firing the sacrifice with d5 covered. The tree is blunt about it: against ...Nf6 the same Nxe5 measures -683. Hold fire, play h3, and take the +0.7 position with the bishop pair instead. The most common reply in the whole tree is the one that guards d5, so the most common correct outcome is not sacrificing at all. Knowing when to hold it is worth exactly as much as knowing when to play it.

    The other habit worth building is the recapture rule: when the g4 bishop trades on f3, take with the queen, always. In the ...Nf6 line, gxf3 measures -0.7 while Qxf3 is +0.7, a full 1.4 swing on a single recapture choice. The queen lands next to the c4 bishop with both pointed at f7, which is where every trap in this opening ends.

    Questions people actually ask

    Is the Bishop's Opening a good opening?
    Yes, and unusually for a trap opening, the fallback positions are honestly good. The tree's quiet branches land between +0.5 and +0.8 with the bishop pair, and the sacrifice branch measures +185 before Black even goes wrong. Nothing in the repertoire depends on the opponent blundering; the blunders just make it spectacular.
    How does Legal's Mate work in the Bishop's Opening?
    After 2.Bc4 d6 3.Nf3 Bg4 4.Nc3, if Black plays a move that does not cover d5, Nxe5 walks through the pin on purpose. If the queen is taken, Bxf7+ forces Ke7 (verified as Black's only legal move) and Nd5 is mate on move seven. The c3 knight, the e5 knight, and the f7 bishop cover every square the king needs.
    What if Black does not take the queen?
    White is better anyway. Declining with ...dxe5 lets the queen collect the loose bishop on g4: knight for pawn, then bishop for free, +1.9 on move six. In the h3 lines the correct recapture ...Nxe5 still costs Black a pawn at +1.7, because h3 chased the bishop to a square nothing defends.
    When is the Nxe5 sacrifice wrong?
    Whenever anything covers d5. The tree measures it precisely from the same position: +185 against ...h6 with d5 free, but -288 against ...Nc6, -621 against ...c6, and -683 against ...Nf6. One defender of d5 turns a mating attack into a lost queen. Ask the question before every sacrifice; the answer is the whole opening.
    What is the difference between this and the Italian version of Legal's Mate?
    One move. In the Italian, Black's knight sits on c6 guarding e5 twice, so White must insert h3 and force the bishop to h5 before sacrificing. In the Bishop's Opening move order Black usually never plays ...Nc6, so the same mate arrives a full move earlier. And when Black does play ...Nc6, the tree simply teaches the h3 version: 34 percent still grab the queen and get mated on move eight.

    Drill the Bishop's Opening against a real opponent

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