context: 1. f2f4 The most natural and also the best move, opening the diagonal for the bishop and attacking the a7-pawn. No wonder it was played in all four games of the round. 1... a8b6  2. a1b3  2... f7f5  3. e2e4 Judging by the other games, this is a kind of \"theoretical line\" from this starting position. The computer doesn't approve of this move. 3... f5e4  4. e1e4  4... g8d5 A logical move, improving the position of the bishop and leaving room for the queen. However, the bishop can be attacked by the knight after Ne3. 5. e4e1  5... h8g8  6. g1f2  6... f8g6 