Author: Roy Eassa
Date: 10:21:13 09/09/02
Go up one level in this thread
On September 09, 2002 at 11:20:28, Janos Keinrath wrote:
>[D]2kr3r/1p2q1b1/pPp3p1/5p2/3PpP2/1QR1P3/5P1p/2R2B1K b - -
>
>In a blitz game my program played here Kb8 and lost after Bxa6.
>
>Crafty 18.15 after 5 minutes also want to play Kb8 (Celeron 1.2 / 32MB Hash).
>
>Is there any defence for black in this position?
>
>Janos
I studied this one a long time, with Fritz & Shredder, and I think Black might
just escape if he plays perfectly. However, there are many missteps that permit
White a nice victory:
1...Rd6!
[1...Kd7 2.Bxa6! Ke8 3.Bxb7! Qxb7 4.Rxc6 Kf8 5.Rc7 +-]
[1...Kb8 2.Bxa6! bxa6 3.Rxc6 Bxd4! 4.Rc7!
(A: 4.exd4 e3! 5.f3 e2 6.Qc3
(6.Re6 Qb7 =
(or 6...Qd7 7.b7 Rde8 =)
6...Qd7 7.Re1 Qd5 =)
(B: 4.Qc2 Qa3 5.b7 Kxb7 6.Qc4! Qd3 7.Rc7+ Kb8 8.Rb7+ Kxb7 9.Qc7+ =)
4...Qe8
(A: 4...Bxe3 5.fxe3
(or 5.Rxe7 Bxc1 6.Ra7 Bxf4 7.Qa4 +-)
5...Qd6 6.Qc2 a5 7.b7 Qb6 8.Rc6 Qxb7 9.Qc5 +-)
(B: 4...Qf6 5.exd4 Qd6 6.Qf7 Qxb6 7.R7c6 Qb7 8.Qa2! Rxd4 9.Qe6! +-)
5.Qc4!
(5.exd4 Qb5 =)
5...Bxb6 6.Qxa6 Rd1+ 7.Rxd1 Kxc7 8.Rc1+ Qc6 9.Rxc6+ Kxc6 10.Qc4+ +-]
2.Bxa6 Kd8
[perhaps easier is 2...bxa6 3.Rxc6+ Rxc6 4.Rxc6+ Kb8 5.Rc7
(5.b7 Bxd4! 6.exd4 e3! =)
5...Qf6 6.Qb4
(6.Qa2 Qxb6 7.Rxg7 Qc6 =)
6...Rd8 7.Qa5 Rxd4! 8.exd4 Qxd4 9.Qxa6 Qd1+ 10.Kxh2 Qh5+ =]
3.Bc4 Qh4
[3...g5 4.Qa2 Qd7 5.fxg5 Rh5 6.Qa8+ Qc8 7.Qxc8+ Kxc8 8.Ra3 Rxg5
9.Ra8+ Kd7 10.Rb8 Rdg6 11.Bf7 Rg1+ 12.Kxh2 R6g2+ 13.Kh3 Bf6
14.Rxb7+ Kd6 15.Be8 Rxc1 16.Kxg2 Rb1 ±]
4.Qa2 Ke7 5.Bg8! Qh3!
[5...Qf6 6.Ra3! Rd8 7.Rxc6! bxc6 8.Ra7+ Ke8 9.Rf7 Qd6 10.Rxg7 +-]
6.Qf7+ Kd8 7.Qc7+ Ke8 8.Bf7+ Kf8 9.Qxd6+ Kxf7 10.Qd7+ Kg8 11.Qe6+ Kh7
12.R3c2 Bxd4! 13.Qf7+
[13.exd4?? Qf3+ 14.Kxh2 Kg7+ 15.Kg1 Rh1#]
13...Bg7 =
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