Openings · A02–A03

Bird's Opening

1.f4 — a Dutch Defence with an extra move, and the loosest first move that is still respectable.

1.f4played as White

The idea

The pawn on f4 takes e5 away and points at the kingside. White follows with Nf3, e3, b3 and Bb2, castles, and plays for the e5 square and a slow attack down the half-open f-file.

The cost is paid at once: the e1–h4 diagonal is open, and the king's cover has a hole in it before either side has developed a piece. Most of what goes wrong for White in this opening goes wrong on that diagonal.

Practise the line

You play White; the other side answers on its own. Nothing here is saved or graded.

Your move 1 of 10/1

1.f4

Your move. Drag a piece, or tap it and then its square.

Common mistakes

Three that come up again and again below master level. Each is ordinary opening theory — a named trap, or the error every coach corrects — not a statistic, and not drawn from anybody's games.

Walking into From's Gambit

1.f4 e5 2.fxe5 d6 3.exd6 Bxd6 4.Nc3 Qh4+ 5.g3 Qxg3+

The mistake: Taking both pawns and then developing with 4.Nc3, as if the position were an ordinary one.
Why it costs: It is mate in two more moves: 5…Qxg3+ 6.hxg3 Bxg3 is checkmate, because the f-pawn has gone and f2 is the only flight square the king has. Every piece White owns is still on the back rank.
Instead: 4.Nf3, which takes h4 from the queen, followed by g3 and Bg2. A pawn up in a sharp position is a fine outcome; walking down the diagonal you opened on move one is not.

Building the Stonewall the wrong way round

1.f4 d5 2.Nf3 Nf6 3.e3 g6 4.d4 Bg7 5.c3 O-O 6.Bd3 c5

The mistake: Playing d4, e3 and c3 behind the f-pawn without asking where the queen's bishop is going.
Why it costs: That is a Stonewall with the bad bishop still inside the wall. The pawns on c3, d4, e3 and f4 leave the bishop on c1 with a single diagonal and nothing on it, while Black plays …Bf5 or …Bg4 and …Ne4 with the better version of the same structure.
Instead: b3 and Bb2 before the chain is built, so the bishop is outside it. Bird players who like the Stonewall play the bishop first, every time.

Forcing e4 against 1…d5

1.f4 d5 2.Nf3 Nf6 3.d3 g6 4.e4 dxe4 5.dxe4 Qxd1+

The mistake: Breaking with e4 to get a pawn to e5, when Black has already put a pawn on d5.
Why it costs: …dxe4 and the queen trade on d1 leave White with the king in the middle of an open board, no castling and no attack, in exchange for a square that was a long-term plan rather than a move-six break.
Instead: b3, Bb2, Be2 and O-O. The e-pawn advances when the answer to it is not an exchange of queens.

Try it on one of your own

The board above is for the line itself; this is for a game you played. Paste a game in this opening, or pull one from chess.com, and every move is graded against what the engine would have played. Open the board, read how the grading works, or go back to the other openings.