Square One
    Opening Walkthrough
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    Opening Coach

    Philidor Defense

    C41You play black
    1/10
    Opponent to move…

    White grabs the center. You won't fight fire with fire — you'll build something solid and let White overreach.

    Your line10 to go

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

    The Philidor: Legal's Bait, Declined

    The oldest trap in chess is pointed straight at this opening — at YOU. Take the knight, not the queen, and he's the one a piece down.

    The Philidor is the unfashionable, unbreakable answer to 1.e4: you hold e5 with a pawn instead of a knight, and nothing in your camp is loose. It is also the exact structure Legal's Mate was built to punish — every time you play ...Bg4 you are dangling the most famous trap in chess with yourself as the victim. We teach it from White's side in the Italian and the Bishop's Opening. This is the other side: how to recognise the queen being offered, take the knight instead, and walk off a piece up. Same squares, same pieces, opposite ending.

    The line, move by move

    1. e4 e5 2. Nf3 d6 3. Bc4 Bg4 4. Nc3 Nc6 5. Nxe5 Nxe5 6. f3 Nxc4

    1. 1. e4 (opponent) The king's pawn. Half the games you will ever play open like this.

    2. 1... e5 (you) Meet him in the middle. No cleverness required yet.

    3. 2. Nf3 (opponent) He attacks e5. Almost everyone defends it with a knight here. You are going to defend it with a pawn.

    4. 2... d6 (you) d6. The e5 pawn is propped up by another pawn, so there is nothing hanging anywhere in your position. That solidity is the whole point of the opening — and it is also why the oldest trap in chess was invented against exactly this setup.

    5. 3. Bc4 (opponent) Bc4 — 43% play it, his most popular third move by a distance. That bishop now stares at f7, and f7 is going to matter in every branch of this tree.

    6. 3... Bg4 (you) Bg4. 21% play it, and it is the move this whole lesson lives on: your bishop pins his knight on f3 to his queen on d1. He cannot move that knight without hanging her — unless he WANTS her hanging. Legal wanted her hanging.

    7. 4. Nc3 (opponent) Nc3 — 15%. Look at what he has just finished building: bishop on c4 aimed at f7, a knight on c3 that can jump to d5, and your bishop sitting on g4. That is Legal's mating net, fully assembled, pointing at your king.

    8. 4... Nc6 (you) Nc6! 18% play it and it is the one that changes the arithmetic: e5 is now defended by a PIECE as well as the d6 pawn. If he grabs on e5 you get to answer with the knight instead of the pawn — and that single choice is the difference between winning a piece and getting mated.

    9. 5. Nxe5 (opponent) Nxe5!? — 10% go for it. His queen on d1 is now hanging to your bishop and he is desperate for you to take her. Do not. 5...Bxd1 6.Bxf7+ Ke7 7.Nd5 is CHECKMATE — I ran it on the board: your king has no square, your own queen and bishop seal d8 and f8, and Kxf7 is illegal because his knight on e5 covers it.

    10. 5... Nxe5 (you) Nxe5! Knight takes knight. His queen lives, you live, and you are a clean knight up for one pawn — the engine swings from mate-against-you to -2.9 for him. The other tempting recapture is also wrong: 5...dxe5 6.Qxg4 and he is +1.7, because the pawn does not defend your bishop on g4. Your knight on e5 does.

    11. 6. f3 (opponent) f3 — 56%, far and away the main move. He shoves the bishop away and breathes out. Look at what he did not do while he was doing it.

    12. 6... Nxc4 (you) Nxc4! The bishop on c4 has zero defenders — I checked every white piece on the board, nothing covers that square. He answers fxg4 and grabs your bishop, so it is bishop for bishop, and the extra knight stays yours.

    Every branch cashes out

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

    • Nc3 / Nxe5 / f3Sound line

      +2.4 after he takes back on g4: a knight for two pawns, bishops swapped off, his king still sitting on e1 with not a single pawn left on the f-file. He 'won' a pawn on move five and paid a knight for it.

    • Nc3 / Nxe5 / Bxf7++5.5 by force

      +5.5 on move six. Two whole pieces for two pawns — and count his queen's options: Qe2, Qf3+, Qxg4, three legal squares in the entire position, and the third one loses her to the knight on e5. The f7 sacrifice needs a knight on e5. You took it.

    • Nc3 / Nxe5 / Be2Sound line

      +2.5. He recaptures, the position goes completely normal, and you are a knight up for a pawn in it. His BEST move in the whole line still leaves him losing — that is what it means when a trap backfires.

    • Nc3 / Nxe5 / Qxg4+11.3 by force

      +11.3 on move six. He sacrificed a knight to bait YOUR queen and lost his own instead. This whole tree in one move: the piece you take WITH matters more than the piece you take.

    • Nc3 / h3Sound line

      -0.7 — the engine still nudges him, and that is a nothing. Read what actually happened: he had mate-in-one on the board at move six and a knight on d5 at move seven, and eight moves in it is just a game of chess. Against the f7 battery, surviving IS the payoff.

    • Nc3 / d3+3.9 by force

      +3.9. He offered the same queen in a different position with a different piece defending, and this time the punishment ran through c2 instead of e5. The rule that catches both: the moment his knight leaves f3, ask what YOUR knight can reach.

    • h3+4.0 by force

      +4.0. A whole knight for nothing, and the pawns he shoved to chase your bishop are exactly why his king has nowhere left to sit. He spent three moves attacking a bishop that was never in any danger.

    Why it works

    The Philidor is the quiet answer to 1.e4: the e5 pawn is propped by d6 and nothing in the Black camp hangs. That solidity is exactly why the oldest trap in chess was invented against it. White assembles the Legal setup with completely natural moves: Bc4 eyeing f7 (43 percent play it), your Bg4 pinning his f3 knight (21 percent), then Nc3 finishing the mating net. The bait is Nxe5, offering the queen. Grab her with Bxd1 and 6.Bxf7+ Ke7 7.Nd5 is checkmate, verified square by square on the board: your own queen and bishop seal d8 and f8, and the e5 knight covers f7.

    The whole lesson is that the same bait has opposite verdicts one detail apart. With your knight on c6, answering Nxe5 with Nxe5 flips the engine from mate-against-you to -2.9 for White, and every follow-up digs him deeper: 6.f3 runs into Nxc4 and a knight for two pawns, 6.Bxf7+ Kxf7 hands over two pieces for two pawns, even his best try 6.Be2 leaves him a knight down for a pawn, and the 1 percent who take the bishop with Qxg4 lose the queen to Nxg4 on the spot.

    Remove the knight from c3 and the arithmetic reverses. After the immediate 4.h3 there is no Nd5 mate, so if White ever plays Nxe5 the queen grab is genuinely on: Bxd1, and after 6.Bxf7+ Ke7 7.Kxd1 dxe5 the engine reads -10.7 for White. Which piece you reach for is the whole game.

    How to punish the Philidor Defense

    Playing White against the Philidor, the first rule is not to trust the folklore: the Legal bait only mates the greedy. Against 4.Nc3 Nc6, the grab 5.Nxe5 is refuted by the simple knight recapture at -2.9, and every continuation from there loses more. The move that actually scores is the quiet pin kick. After 4.Nc3 Nc6 5.h3, 49 percent of club players retreat the bishop to h5 to keep the pin, and that retreat hangs a piece: 6.Nxe5 Nxe5 7.Qxh5 collects the bishop for +2.3, because h5 sits on the queen's own diagonal with nothing defending it.

    The immediate 4.h3 cashes the same statistic from the other side: 63 percent of Philidor players take on f3, and after Qxf3 and the natural Nf6 the engine already reads +2.3 for White. Just do not go hunting afterwards: in that line the Ng5 lunge is defended by nothing and Qxg5 takes it clean off, while the calm d3 (51 percent play it) keeps an ordinary game.

    How to avoid falling into it

    The rule that catches every version of the trap: before taking a free queen, look for a knight on c3. With it on the board, Bxd1 walks into Bxf7+ and Nd5 mate, and the tree verified that in two separate positions, the immediate 5.Nxe5 and the delayed version after 5.d3 Nd4 6.Nxe5. Recapture with whatever actually defends e5 instead: the c6 knight when it is there, the d6 pawn when your knight has gone to d4, and in the d3 line the follow-up Nxc2+ forks king and rook and wins the exchange on top.

    The other habit is knowing which answer to the pin kick is safe. With knights on c3 and c6, take on f3, because Bh5 hangs a piece to Nxe5. After the early 4.h3, keep the pin with Bh5, because there taking on f3 runs to +2.3 for White while Bh5 holds it to +0.9. And after Bxf3 Qxf3, treat Nf6 as a fire door rather than development: his queen and bishop are both aimed at f7, and the 7 percent who play the natural-looking Nd4 instead get mated on the spot.

    Questions people actually ask

    Is the Philidor Defense sound?
    Yes. It is solid and a little passive: in the calm branches the engine keeps White's edge under a pawn, between +0.5 and +0.9, which is ordinary opening territory. The real risk is not the eval, it is that Legal's Mate targets this exact structure, so the Philidor player has to know the bait cold before playing Bg4.
    What is Legal's Mate in the Philidor?
    1.e4 e5 2.Nf3 d6 3.Bc4 Bg4 4.Nc3, and then Nxe5 offering the queen. Grabbing her with Bxd1 loses to 6.Bxf7+ Ke7 7.Nd5, checkmate, board-verified. Answering with 5...Nxe5 instead leaves White a knight down for a pawn at -2.9. The trap and its refutation are two squares apart.
    Should Black ever take the queen after Nxe5?
    Only when White has no knight on c3. After the early 4.h3 there is no mating piece, and the grab is real: Bxd1, then 6.Bxf7+ Ke7 7.Kxd1 dxe5 measures -10.7 for White. With a knight on c3, the identical grab is checkmate in two against you. Count that one square before you reach.
    What if White never takes on e5?
    Then you get a normal game, and the tree covers it: after 4.Nc3 Nc6, the kick 5.h3 is the most popular move at 47 percent. Take on f3, meet the near-universal Qxf3 with Nf6 to shut the f7 diagonal, and the line ends with the engine giving White a nudge well under a pawn and the attack evaporated. Against the f7 battery, surviving is the payoff.
    At what rating does the Legal trap appear?
    The frequencies behind this walkthrough come from Lichess blitz and rapid games between 1000 and 1600. There, 10 percent of players take the e5 bait in the main line and about half choose the piece-losing bishop retreat against h3. The mates and the evals are rating-proof; only the bite rate changes.

    Drill the Philidor Defense 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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