King's Indian Attack

White sets up a King’s Indian Defense with an extra move — Nf3, g3, Bg2, O-O, d3 and e4. Bobby Fischer used it often.

It is reached after 3 moves: 1. Nf3 d5 2. g3.

Black is to move and has 28 legal moves. Over the next four moves — two for each side — the game can branch into 465,097 different games. Those games reach 162,362 different positions: most positions can be reached in more than one way, 2.9 on average.

The Lichess opening list names 15 further lines after this position, such as Sicilian Variation (2... c5) and Double Fianchetto (2... g6).

The same moves can be played in 2 different legal orders that all reach this position. For example 1. g3 d5 2. Nf3, which starts as the Hungarian Opening.