1.Bg4 !
Thematic try : 1.Bh5 ? (1.Ba4 ? Ne4=) 1…Ne4 ! 2.Kh2 Nd6 !! (2…Nxc3 ? 3.Bf3 ! see main line) 3.g4 Kb(c,d)2 4.g5 Kxc3 =
1…Ne4 !
1…Kd2 2.c4 Kc3 (2…Kd3 3.c5 ! +-)3.Be2 !! +- and not 3.c5 ? Ne4 ! 4.c6 Nxg3+ 5.Kg2 Ne4 5.c7 Nc6 =
2.Kh2 !!
Thematic try : 2.Kg2 ? Nxc3 3.Bf3 Na4 !! (3…Nb5 ? see main line) 4.g4 Nc5 5.g5 Ne6 ! 6.g6 Nf4+ and 7…Nxg6=
2…Nxc3
3.Bf3 ! Nb5 !
Now, 3…Na4 is not efficient : 4.g4 Nc5 5.g5 Ne6 6.g4 and there is no check on f4.
If 3…Kd2, then 4.g4 Ke3 5.Kg3 Nb5 6.g5 Nd6 7.g6 +-
4.g4 Nd4
5.Kg3 Kd2
5…Ne6 6.Bd5 ! Ng5 7.Kf4 ! +- (7.Kh4 ? Nh7 !=)
6.Kf4
6.g5 ? Nf5 ! 7.Kf4 Ne7 ! 8.Be4 Ke2 ! 9.Ke5 Ke3 ! 10.Bh7 (10.Bf5 Kf3 ! =) 10…Kf3 11.Ke6 Kf(g)4 = or 8.Ke5 Ng6+ ! (8…Ke3 ? 9.Be4/h5 +-) 9.Kf6 Nh4 ! =
6…Ne6+
7.Kf5 !
7.Ke5 ? Ng5 ! 8.Bg2 (8.Be4 Ke3 !=) 8…Ke3 9.Kf5 Nf7 10.Bd5 Nh6+ =
7…Nd4+
8.Ke4
8.Kf4(?) Ne6+ 9.Kf5 = loss of time
8… Nc6
8…Ne6 9.Bg2(h1) +-
9.g5
9.Kf5(?) Nd4+ 10.Ke4 = loss of time
9… Ne7
10.Bh5 ! +-
10.Ke5 ? Ng6+! 11.Kf6 Nh4 =