Nº23 Igor Zaitsev & Oleg Pervakov

Draw

Igor Zaitsev & Oleg Pervakov (Russia)

wKb4,Nc8,g6,Rg8,Pd4,h6/bKh7,Na8,c5,Ba1,Pd2

1.Nce7!
Try 1.Nge7? Bxd4! 2.Rg7+ Kxh6! 3.Nf5+ Kh5 4.Rh7+ Kg5 5.Rh1 Nd3+! 6.Kc4 Ne1 7.Nxd4 d1Q 8.Rxe1 Qa4+! 9.Kd3 Qa6+–+
1.Rh8+? Kxg6 2.Rg8+ Kxh6 3.Rg1 Nd3+ 4.Kc4 Ne1–+

1…Bxd4 2.Rg7+! Kxh6!
2…Bxg7 3.hxg7 Kxg7 4.Nf5+ Kxg6 5.Ne3=

3.Nf5+ Kg5
3…Kh5?? 4.Nf4#

4.Nxd4 …. With 3 lines :

A) 4…Nd3 5.Ka3!
5.Kc3? d1Q 6.Ne5+ Kf6 7.Rg6+ Kxe5 8.Rg1 Ne1= (8…Qa4=)

5…d1Q
5…Kf6 6.Ne5! Kxg7 7.Nf5+ Kf6 8.Ne3 Kxe5 9.Nc4+=

6.Ne5+ Kh5 7.Rh7+ Kg5 8.Rg7+….

A.1.) 8…. Kf4 9.Rg4+! Kxe5 [Or 9…Ke3 10.Nc4+ Kf2 11.Rg2+! Kxg2 12.Ne3+=] 10.Rg1! Domination 10…Qh5 [Or 10…Ne1 11.Rxe1+ Qxe1 12.Nf3+=] 11.Rg5+! Qxg5 12.Nf3+=

A.2.) 8…Kf6 9.Rg6+ Ke7!? 10.Nf5+ Kf8 11.Rf6+ Ke8 12.Re6+ Kd8 13.Rd6+ Kc7! 14.Rd7+! (14.Rxd3? Qa1+–+; 14.Nxd3? Qf3–+) 14…Kb8 15.Rd8+ (15.Nxd3? Qf3! 16.Ne7 Nb6–+) 15…Ka7! (15…Kb7 16.Nd6+=) 16.Nxd3 (16.Rd7+? Ka6 17.Nxd3 Qf3! 18.Ne7 Nb6–+) 16…Qf3 (16…Nb6 17.Rd4! Qf3 18.Nd6=; 16…Qc2 17.Rd7+ Kb8 18.Kb4! Nb6 19.Rd4=) 17.Ne7 Nb6 18.Ng6! Qf6 (18…Nc4+ 19.Kb4=) 19.Nge5! (19.Nde5? Nc4+! 20.Nxc4 Qc3+!–+) 19…Qxd8 (19…Nc4+ 20.Nxc4 Qxd8 21.Nde5=) 20.Nc6+=

B) 4…Na6+ 5.Kc3! d1Q 6.Nh4+!! (6.Nh8+? Kf4 7.Rf7+ Ke5 8.Ng6+ Kd6 9.Rf6+ Kd7! 10.Ne5+ Kc8 11.Rxa6 Nc7–+; 6.Ne5+? Kf6 7.Rg6+ Kxe5–+; 6.Nf8+? Kf6 7.Rg6+ Kf7 8.Rxa6 Qe1+–+) 6…Kh5 (6…Kf6 7.Rg6+ Kf7 8.Rxa6=) 7.Rh7+ Kg4 8.Rg7+ Kxh4 (8…Kh3 9.Ndf5 Nb6 10.Rg3+ Kh2 11.Rg2+ Kh3 12.Rg3+=; 8…Kf4 9.Rf7+ Ke5 10.Nhf3+ Kd6 11.Rf6+ Kc5 12.Rxa6=) 9.Nf5+ Kh5 (9…Kh3? 10.Rh7+ Kg4 11.Ne3++-) 10.Ng3+ Kh6 11.Nf5+= Perpetual check;

C) 4…d1Q 5.Kxc5 Qc1+ 6.Kd6! Qa3+ (6…Kf6 7.Ra7! Nb6 8.Ne7=) 7.Ke6! Qa6+ 8.Ke5! (8.Kf7? Qf6+ 9.Kg8 Kh6!–+) 8…Qa5+ (8…Qf6+ 9.Ke4 Qxg7 10.Ne6+=) 9.Ke6 (9.Ke4? Kf6–+) 9…Nc7+ (9…Qb6+ 10.Ke5 Qc5+ 11.Ke4 Kf6 12.Rg8 Nb6 13.Nf4!=) 10.Rxc7! Qxc7 11.Ne7! (11.Ne5? Kf4!–+) 11…Qc4+ (11…Qc5 12.Ndc6!=) 12.Ke5 Qc7+ (12…Qc5+ 13.Nd5=) 13.Ke6= Positional draw