Kádas Opening

Named after the Hungarian player László Kádas. The rook’s pawn advances two squares and leaves the centre to Black.

It is reached after a single move: 1. h4.

Black is to move and has 20 legal moves. Over the next four moves — two for each side — the game can branch into 218,829 different games. Those games reach 79,450 different positions: most positions can be reached in more than one way, 2.8 on average.

The Lichess opening list names 8 further lines after this position, such as Koola-Koola Variation (1... a5) and Schneider Gambit (1... g5).