Nº27 Sergey Osintsev

Win
Section B.1.

Sergey Osintsev (Russia)

wKc2,Qh2,Nc3,Bf8,Re3,Pc6,f7/bKa8,Qd4,Nh8,Bd8,Rb8,Pa7,b7,c4,g6

1.Bg7!!
Tries 1.c7? Bxc7 2.Qxc7 Qxe3 3.Qxb8+!? Kxb8 4.Bd6+ Kc8 5.f8Q+ Kd7 6.Bf4 Qf2+=; 1.cxb7+? Rxb7 2.Bc5! Qxc5 3.Qxh8 Qf5+ 4.Ne4 Qxf7 5.Qxd8+ Rb8=
1.Qg3? bxc6! 2.Bd6 Bg5! 3.Bc5! Qf4! 4.Qxf4 Bxf4 5.Re7 Rd8! 6.Rd7! Nxf7 7.Rxa7+ Kb8 8.Rxf7=

1…Qxg7 2.c7 Bxc7 3.Nd5!!
3.Qxc7? Qxf7 4.Re7 Qf2+–+

3…Bd8
3…Bxh2 4.Nb6+! axb6 5.Ra3# vertically checkmate by Rook

4.Re8!
4.Nb6+?! Bxb6 5.Re8 Rd8! 6.Qh3 Qf8 7.Rxf8 Rxf8 8.Qd7 Nxf7 9.Qe7 Rc8 10.Qxf7 Black won’t lose
4.Qc7?! a5! 5.Nb6+ Ka7 6.Qxb8+ Kxb8 7.f8Q Qxf8 8.Nd7+ Kc7 9.Nxf8 Nf7 Black won’t lose

4…Nxf7
4…Qxf7 5.Qxb8+! Kxb8 6.Rxd8# horizontal checkmate by Rook

5.Rxd8! Nxd8
5…Rxd8 allows Lucena checkmate combination 6.Nc7+ Kb8 7.Na6+ Ka8 8.Qb8+! Rxb8 9.Nc7#!

6.Qh8!!
6.Nc7+? Qxc7 7.Qxc7 Nc6 Black won’t lose

6…Qd7
or 6…Qxh8 7.Nc7#! Lucena mate

7.Nb6+! axb6 8.Qa1+ Qa4+ 9.Qxa4# vertical checkmate by Queen