Nº27 Sergey Osintsev

BTM Win

Section A

Sergey Osintsev (Russia)

wKa3,Qb5,Ng3,Pb7/bKh7,Ba2,c1,Rb2,Pb3,c2,e3,f5,g4,g7

1…Rb1+ 2.Kb4!
2.Ka4? b2! 3.Qxf5+ g6 4.Qd7+ Bf7! 5.Qxf7+ Kh6 6.Kb3 Ra1! 7.Qf4+ Kh7 8.Qc7+ Kh6=

2…Ba3+!
2…Bd2+ 3.Ka4 b2 4.Qxf5+ g6 5.Qxc2+-

3.Ka4!! The better this move is, it will be revealed later.
Thematic try 3.Ka5? b2! 4.Qxf5+ g6 5.Qd7+ Be7! 6.Qxe7+ Bf7! 7.Qxf7+ Kh6 8.Qf4+ Kh7 9.Qc7+ Kh6= Having sacrificed the Bishops, Black freed the a-file. Black has two fortresses: the Black King with pawns successfully opposes the white Queen and Knight, the Rook and pawns mutually defend each other, it is impossible 10.Qxc2?? Ra1+ 11.Kb6 b1Q+–+ White cannot strengthen his position.

3…b2!
3…c1Q 4.Qxf5+ g6 5.Qf7+ Kh6 6.b8Q Qc6+ 7.Kxa3 Qc5+ 8.Qb4 Qc1+ 9.Ka4 Qc6+ 10.Qb5 Qxb5+ 11.Kxb5 b2! 12.Qf8+! Kh7 13.Ne4!+-

4.Qxf5+
4.b8Q?? Be6! 5.Q5e8 Bf8!! 6.Qxe6 Ra1–+

4…g6 5.Qd7+
5.Qxc2? Bd6! 6.Ne4 Rf1 7.Qxb2 Rf4 8.Qh2+ Kg7 9.Qb2+ Kh7!=

5…Be7! 6.Qxe7+
6.b8Q? Bf7!! 7.Qxb2 Rxb2 8.Qxe7=

6…Bf7! 7.Qxf7+ Kh6 8.Qf8+!
Thematic try 8.Qf4+?! Kh7 9.Kb3? c1Q 10.b8Q Qd1+ 11.Kb4 Qd2+! 12.Kb3=

8…Kh7 9.Qe7+ Kh6 10.Qxe3+ Kh7 11.Qe7+
11.Kb3? c1Q 12.Qe7+ Kh6=

11…Kh6 12.Qf8+
Try to destroy the fortress with the help of Knight sacrifices are ineffective 12.Nf5+?! gxf5 13.Qf6+ Kh5(h7)=
or 12.Qh4+?! Kg7 13.Nh5+?! gxh5 14.Qg5+ Kf7!=

12…Kh7 13.Qf7+ Kh6 14.Qf4+! Kh7 Having eliminated the pawn, the Queen came back, and White carries out the main plan, prepared 12 moves back by the move 3.Ka4!

15.Kb3!
15.Qc7+?! Kh6 16.Kb3? c1Q 17.b8Q Qe3(d1)+ 18.Qc3 Qe6+! 19.Kb4 Qe7+! 20.Kb5 Qd7+! 21.Qc6 Qxc6+ 22.Kxc6 Rc1+ 23.Kd5! b1Q 24.Qh8+ Kg5 25.Ne4+ Qxe4+! 26.Kxe4=

15…c1Q 16.b8Q Qd1+ 17.Kb4 Qa4+!
or 17…Qe1+ 18.Kb5 Qa5+ 19.Kxa5+-

18.Kxa4 Ra1+ 19.Kb5! b1Q+ 20.Kc6! Qc2+ 21.Kd7! Rd1+ 22.Ke7! Qc5+ 23.Kf6! Qc6+ 24.Kg5 Rd5+ 25.Kxg4 Qe6+ 26.Kf3+-