Just like Dubov yesterday, White tries to force concessions  on the queenside before launching his kingside attack.
1. g1f3  1... d7d5  2. d2d4  2... g8f6  3. c2c4  3... d5c4  4. b1c3 In a must-win situation, Krasenkow  is ready to sacrifice a pawn. And not only one... 4... a7a6  5. e2e4  5... b7b5  6. e4e5  6... f6d5 