Sicilian Defense:Scheveningen Variation, Keres Attack

Named after Paul Keres: White throws the g-pawn forward on move six to drive away Black’s knight.

It is reached after 11 moves: 1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 d6 6. g4. It is a line of the Sicilian Defense.

Black is to move and has 29 legal moves. Over the next four moves — two for each side — the game can branch into 1,492,598 different games. Those games reach 485,273 different positions: most positions can be reached in more than one way, 3.1 on average.

No later position on this line has a name of its own in the Lichess opening list: the names end here.

The same moves can be played in 8,568 different legal orders that all reach this position. For example 1. e4 c5 2. d4 e6 3. Nf3 cxd4 4. Nxd4 Nf6 5. Nc3 d6 6. g4, which starts as the Sicilian Defense: Smith-Morra Gambit.