Author: Dieter Buerssner
Date: 10:41:16 10/18/01
Go up one level in this thread
On October 18, 2001 at 09:14:43, José Antônio Fabiano Mendes wrote:
> L.D.Evans-Haik,London 1978 [unusual and difficult position]
> [D]8/p2P3P/k7/8/8/2q5/6PK/1Q6 b
> "Surprisingly Black can deliver perpetual check or force stalemate."
> Source:"Tactical Chess Endings",by GM John Nunn,page 35
Tried this with Yace, AMD K6-2 475. It cannot see a draw at reasonable time, but
the score rises with almost each iteration. Perhaps KQPKQ TB could help (I don't
have this installed).
1308812 12.513 -3.40 8t 1...Qe5+ 2.Kh3 Qe6+ 3.Kg3 Qd6+ 4.Kf3 Qf6+ 5.Kg4
Qd4+H 6.Kf3H {-160}
1425796 13.826 -3.40 8. 1...Qe5+ 2.Kh3 Qe6+ 3.Kg3 Qd6+ 4.Kf3 Qf6+ 5.Kg4
Qd4+ 6.Kf3 {-160}
3479131 32.726 -3.40 9t 1...Qe5+ 2.Kh3 Qh5+ 3.Kg3 Qg5+ 4.Kf3H Qf6+H
5.Ke2H Qe6+H 6.Kd2H Qh6+H 7.Kc3H Qf6+H 8.Kb3H
Qb6+H 9.Ka2H Qa5+H 10.Kb2H Qe5+H 11.Kc1H Qg5+H
12.Kb2H Qe5+H 13.Kc1H Qg5+H 14.Kb2H Qe5+HR
{-160}
3754940 35.200 -3.40 9. 1...Qe5+ 2.Kh3 Qh5+ 3.Kg3 Qg5+ 4.Kf3 Qf6+ 5.Ke2
Qe6+ 6.Kd2 Qh6+ 7.Kc3 Qf6+ 8.Kb3 Qb6+ 9.Ka2
Qa5+ 10.Kb2 Qe5+ 11.Kc1 Qg5+ 12.Kb2 Qe5+ 13.Kc1
Qg5+ 14.Kb2 Qe5+ {-160}
5871038 54.589 -3.00 10++ 1...Qe5+ 2.Kh3 Qh5+ 3.Kg3 Qg5+ 4.Kf3 Qf6+ 5.Ke2
Qe6+ 6.Kd2 Qh6+ 7.Kc3 Qf6+ 8.Kb3 Qb6+ 9.Ka2
Qa5+ 10.Kb3 Qd5+ 11.Ka4 Qxd7+ 12.Ka3 Qg7 13.Qh1
{-80}
10993603 1:42.2 -2.63 10t 1...Qe5+ 2.Kh3 Qe6+ 3.Kg3 Qe3+ 4.Kg4H Qd4+H
5.Kg5H Qe3+H 6.Kf5H Qc5+H 7.Kf4H Qe7H {HT}
11392493 1:47.4 -2.63 10. 1...Qe5+ 2.Kh3 Qe6+ 3.Kg3 Qe3+ 4.Kg4 Qd4+ 5.Kg5
Qe3+ 6.Kf5 Qc5+ 7.Kf4 Qe7
16158351 2:37.4 -2.23 11++ 1...Qe5+ 2.Kh3 Qe6+ 3.Kg3 Qd6+ 4.Kf3 Qf8+ 5.Ke2
Qe7+ 6.Kd2 Qb4+ 7.Kd3 Qxb1+ 8.Ke3
20941325 3:22.7 -1.98 11t 1...Qe5+ 2.Kh3 Qe6+ 3.Kg3 Qd6+ 4.Kf3 Qf8+ 5.Ke3
Qc5+ 6.Kf4 Qd6+ 7.Kg5 Qe7+ 8.Kh5 Qc5+ 9.Kh6
Qe3+ 10.Kg7 Qe7+ 11.Kg8 Qd8+ 12.Kf7H Qxd7+H
13.Kf6H {HT} {-80}
21873811 3:31.8 -1.98 11. 1...Qe5+ 2.Kh3 Qe6+ 3.Kg3 Qd6+ 4.Kf3 Qf8+ 5.Ke3
Qc5+ 6.Kf4 Qd6+ 7.Kg5 Qe7+ 8.Kh5 Qc5+ 9.Kh6
Qe3+ 10.Kg7 Qe7+ 11.Kg8 Qd8+ 12.Kf7 Qxd7+
13.Kf6 Qd8+H 14.Ke6H Qc8+H 15.Kd5H Qd7+H
16.Ke5H Qc7+H 17.Ke6H Qc4+H 18.Kd7H Qd4+H
19.Ke7H Qe5+H 20.Kf7H Qc7+H 21.Kg6H Qd6+H
22.Kh5H Qh2+H 23.Kg6H Qxg2+H 24.Kf7H Qd5+H
25.Kf6H Qd4+H 26.Kg5H Qe5+H 27.Qf5H Qe3+H
28.Qf4H Qc5+H 29.Kg6H Qc6+H {HT} {0}
38167070 6:05.9 -1.98 12t 1...Qe5+ 2.Kh3 Qe6+ 3.g4 Qe3+ 4.Kh4 Qh6+ 5.Kg3
Qe3+ 6.Kg2 Qe2+ 7.Kg1 Qxg4+ 8.Kf2 Qh4+H 9.Kf3H
Qh3+H 10.Ke2H Qg2+H 11.Kd1H Qf1+H 12.Kd2H Qxb1H
13.h8=QH Qb4+H 14.Kc2H Qc5+H 15.Kb2H Qb4+H
16.Kc1H Qc5+H 17.Kb1H Qb4+H 18.Ka1H Qe1+H
19.Ka2H Qd2+H 20.Ka3H Qxd7H 21.Kb2H {80}
41700620 6:35.9 -1.98 12. 1...Qe5+ 2.Kh3 Qe6+ 3.g4 Qe3+ 4.Kh4 Qh6+ 5.Kg3
Qe3+ 6.Kg2 Qe2+ 7.Kg1 Qxg4+ 8.Kf2 Qh4+ 9.Kf3
Qh3+ 10.Ke2 Qg2+ 11.Kd1 Qf1+ 12.Kd2 Qxb1
13.h8=Q Qb4+ 14.Kc2 Qc5+ 15.Kb2 Qb4+ 16.Kc1
Qc5+ 17.Kb1 Qb4+ 18.Ka1 Qe1+ 19.Ka2 Qd2+ 20.Ka3
Qxd7 21.Kb2 {80}
79794895 12:50.5 -1.93 13t 1...Qe5+ 2.Kh3 Qe6+ 3.Kh4 Qe7+ 4.Kg3 Qd6+ 5.Kf3
Qa3+ 6.Kf4 Qd6+H 7.Ke4H Qg6+H 8.Kd4H Qxb1H
9.d8=QH Qxh7H 10.Kc4H {HT}
88372533 14:12.0 -1.93 13. 1...Qe5+ 2.Kh3 Qe6+ 3.Kh4 Qe7+ 4.Kg3 Qd6+ 5.Kf3
Qa3+ 6.Kf4 Qd6+ 7.Ke4 Qg6+ 8.Kd4 Qxb1 9.d8=Q
Qxh7 10.Kc4
108056947 17:38.0 -1.53 14++ 1...Qe5+ 2.Kh3 Qe6+ 3.Kh4 Qe7+ 4.Kg3 Qd6+ 5.Kf3
Qa3+ 6.Kf4 Qd6+ 7.Ke4 Qg6+ 8.Kd4 Qxb1 9.d8=Q
Qxh7 10.Kc4
170816510 28:12.2 -1.52 14t 1...Qe5+ 2.Kh3 Qe6+ 3.Kh4 Qe7+ 4.Kg3H Qd6+H
5.Kg4H Qb4+H 6.Qe4H Qxe4+H 7.Kg5H {HT}
184806734 30:33.1 -1.52 14. 1...Qe5+ 2.Kh3 Qe6+ 3.Kh4 Qe7+ 4.Kg3 Qd6+ 5.Kg4
Qb4+ 6.Qe4 Qxe4+ 7.Kg5
238694957 39:35.6 -1.12 15++ 1...Qe5+ 2.Kh3 Qe6+ 3.Kh4 Qe7+ 4.Kg3 Qd6+ 5.Kg4
Qb4+ 6.Qe4 Qxe4+ 7.Kg5
-- Dieter
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