Sicilian Defense:Old Sicilian

It is reached after 4 moves: 1. e4 c5 2. Nf3 Nc6. It is a line of the Sicilian Defense.

White is to move and has 28 legal moves. Over the next four moves — two for each side — the game can branch into 586,912 different games. Those games reach 200,735 different positions: most positions can be reached in more than one way, 2.9 on average.

The Lichess opening list names 46 further lines after this position, such as Open (3. d4) and Nyezhmetdinov-Rossolimo Attack (3. Bb5).

The same moves can be played in 2 different legal orders that all reach this position. For example 1. Nf3 c5 2. e4 Nc6, which starts as the Zukertort Opening.