Indian Defense:Budapest Gambit

Black answers 2. c4 with the surprising 2...e5, offering a pawn for quick piece play.

It is reached after 4 moves: 1. d4 Nf6 2. c4 e5. It is a line of the Indian Defense.

White is to move and has 31 legal moves. Over the next four moves — two for each side — the game can branch into 827,375 different games. Those games reach 277,070 different positions: most positions can be reached in more than one way, 3 on average.

The Lichess opening list names 10 further lines after this position, such as Budapest Gambit Accepted (3. dxe5).

The same moves can be played in 4 different legal orders that all reach this position. For example 1. c4 Nf6 2. d4 e5, which starts as the English Opening.