Sicilian Defense:Wing Gambit

It is reached after 3 moves: 1. e4 c5 2. b4. It is a line of the Sicilian Defense.

Black is to move and has 23 legal moves. Over the next four moves — two for each side — the game can branch into 589,033 different games. Those games reach 200,201 different positions: most positions can be reached in more than one way, 2.9 on average.

The Lichess opening list names 7 further lines after this position, such as Marshall Variation (2... cxb4 3. a3) and Abrahams Variation (2... cxb4 3. Bb2).

The same moves can be played in 2 different legal orders that all reach this position. For example 1. b4 c5 2. e4, which starts as the Polish Opening.