All Chess Positions Open the map

A00Opening

Polish Opening

1. b4

a8b7c6d5e4f3g2h1

Black to move

Legal moves
20
Games in the next 4 moves
216,145
Different positions among them
78,264
Named lines from here
26

See it on the mapOn the opening map

Also called the Sokolsky Opening and the Orangutan. The last name comes from Savielly Tartakower, who chose it at New York 1924 after a visit to the zoo.

It is reached after a single move: 1. b4.

Black is to move and has 20 legal moves. Over the next four moves — two for each side — the game can branch into 216,145 different games. Those games reach 78,264 different positions: most positions can be reached in more than one way, 2.8 on average.

The Lichess opening list names 26 further lines after this position, such as with d5 (1... d5) and Outflank Variation (1... c6).

Map of every game of the next four moves after the Polish Opening
Every game of the next four moves from this position, as the map draws it. Each ring is one more move; the outer ring holds all 216,145 games.

Move by move

  1. 1. b4Polish Opening

Named lines from here

Related openings

FEN

rnbqkbnr/pppppppp/8/8/1P6/8/P1PPPPPP/RNBQKBNR b KQkq - 0 1