Polish Defense

The Polish Defense meets the Zukertort Opening with 1...b5, the setup of the Polish (or Orangutan) Opening transferred to Black. The pawn gains queenside space and clears b7 for the bishop, which can then bear on the long diagonal and the e4 square. The cost is that Black neither contests the center with a pawn nor develops a piece, and the advanced pawn can become a target. Unlike 1...d5 or 1...Nf6, it does not stop 2. e4, and after that move the bishop on f1 immediately eyes b5.

White has several good options. The most frequent reply is 2. g3, a quiet fianchetto that opposes Black's intended bishop. Next come 2. d4, which takes the center outright and gives White the best practical results, and 2. e4. The engine prefers 2. e4 and 2. d4 and also likes 2. c3, which prepares central expansion and later queenside play such as a4 against the b5 pawn. It rates White's position as slightly better. White also scores clearly better in online games, and the line remains an offbeat choice that is seldom seen in serious play.