Carr Defense

The Carr Defense is the reply 1...h6 to 1. e4, the kingside mirror image of the St. George Defense (1...a6). It is classified under B00 with other irregular answers to the King's Pawn Opening. The move makes no claim on the center and frees no piece, so White can build a broad center and develop at leisure. It also slightly loosens the cover around a king that castles short. Opening references rate it as dubious, and Eric Schiller includes it in his survey of unorthodox openings.

Black's usual scheme gives the rook's-pawn move a purpose. With ...g5 and ...Bg7, Black sets up an extended fianchetto in which the h6-pawn supports the advanced g-pawn. This is followed by ...d6 and the development of the light-squared bishop to g4 or f5. Because the kingside pawns have already moved forward, Black generally castles queenside. The game then often features opposite-side castling, with White's central space set against Black's long-diagonal pressure.

White most often answers with 2. d4, taking the full center at once, and 2. Nf3 is nearly as popular. The third main choice, 2. Bc4, aims at f7 and gives White the best results of the three. The engine's preferences are 2. d4, 2. Nc3 and 2. Nf3, and it assesses the position after 1...h6 as a slight edge for White. That is a larger margin than the first move alone normally confers, which reflects the lost tempo.

The one named branch is the Zilbermints Gambit, 1. e4 h6 2. d4 e5. Here Black strikes at the center immediately instead of fianchettoing and leaves the e-pawn en prise to the d4-pawn, playing for activity in return.

The defense ranks around 478th of roughly 3,200 named openings by games reached, and more than 22,000 Lichess games pass through it. White scores a little over half. Draws are unusually rare at under four percent, so games tend to be decided one way or the other.