Nº32 Sergey Osintsev

Win

Section B.1.

Sergey Osintsev (Russia)

wKg6,Ng2,Bb3,c3,Rg4,Pe6/bKe8,Qd8,Nf3,Pd7,e7,f2

1.Kh7!
Try 1.Kh6? Ng5 2.Rxg5 f1Q 3.Rg8+ Qf8+ 4.Rxf8+ Kxf8=

1…Ng5+ 2.Rxg5 f1Q 3.Rg8+ Qf8 4.Rxf8+
Thematic try 4.Ba4?! Qxg8+ 5.Kxg8 Qc7! (5…Qa8? 6.exd7+ Kd8 7.Nf4 Kc7+ 8.Kf7! (8.Kg7? Qxa4 9.Ne6+ Kd6! 10.d8Q+ Kxe6=) 8…Qxa4 9.Ne6+ Kxd7 10.Nc5++- fork No.1) 6.Nf4! Kd8! (6…Qxc3? 7.exd7+ Kd8 8.Ne6# model mate) 7.exd7 Qc4+! (7…Qxf4? 8.Ba5++-) 8.Kh7! all the White pieces are under attack, but… 8…Qf7+! 9.Kh8 Qf8+!= perpetual check

4…Kxf8 5.Nf4! Qa8!
5…Ke8 6.Ba4!+-

6.Bd5!
Thematic try 6.exd7? Qh1+! (6…Qe4+? 7.Ng6++-) 7.Kg6 Qc6+! (7…Qg1+? 8.Kf5 Qb1+ 9.Ke5+-) 8.Be6 (8.Ne6+ Qxe6+ 9.Bxe6= stalemate; 8.Kg5 Qxd7 9.Ne6+ Ke8 10.Ng7+ Kf8 11.Ne6+ Ke8= perpetual check) 8…Qg2+! (8…Qe4+? 9.Bf5!+-) 9.Kh5 (9.Nxg2= stalemate) 9…Qg5+! 10.Kxg5= model stalemate.

6…Qa4 7.exd7 Qxd7 8.Ne6+

main line A: 8…Ke8 9.Bc4!
loss of time 9.Ng7+ Kf8 10.Ne6+ Ke8

9…Qd1
9…Qc6 10.Bb5! Qxb5 11.Nc7++- sliding fork No.2

10.Bb5+ Kf7 11.Ng5+ Kf8 12.Bg7#! model mate.

main line B: 8…Kf7 9.Ng5+!
9.Nc7+? e6 10.Bxe6+ Qxe6=
9.Nd8+? Ke8 10.Bc6 Kxd8=

9…Kf8
9…Ke8 10.Bf7+ Kf8 11.Bg7# or 10…Kd8 11.Ba5+ Kc8 12.Be6+- pin.

10.Bf7!
10.Bg7+? Ke8 11.Bf7+ Kd8 12.Ne6+ Kc8= not pin.

10…Qf5+
10…Qd3+ 11.Bg6 Qxc3 12.Ne6#
10…e6 11.Bb4++-

11.Bg6 Qxg5 12.Bg7#! model mate.