Author: Robin Smith
Date: 19:18:55 04/09/03
Go up one level in this thread
On April 09, 2003 at 13:22:34, Dieter Buerssner wrote:
>On April 08, 2003 at 19:30:24, Robin Smith wrote:
>
>>The following position is a rather trivial (for a human) perpetual check. Why
>>does it take some programs so long to see it? Many of today's top programs
>>think White is winning, and after long searches too! Which program detects
>>perpetual and returns a draw score the fastest?
>>
>>Tiviakov,S - Tseshkovsky,V
>>Kropotkin, 1995
>> 6k1/7p/4Q1p1/3pP1P1/p6q/Pp1r2R1/1P5P/7K b - - 0 1
>
>Yace shows draw score after 13 seconds (P4, 2.53 GHz):
>
>[ nodes time score depth]
> 738153 0.801 -4.12 8. 1...Kf8 2.Qf6+ Ke8 3.Qc6+ Kd8 4.Qd6+ Ke8 5.Qb8+
> Ke7 6.Qb7+ Ke6 7.Qa6+ Kxe5 8.Qf6+ Ke4 9.Qe7+
> Kf5 10.Qd7+ Ke5 11.Rh3 Rxh3 12.Qxh3 Qxh3 13.Kg1
> {1081}
> 1627332 1.801 -3.72 9++ 1...Kf8 2.Qf6+ Ke8 3.Qc6+ Kd8 4.Qd6+ Ke8 5.Qb8+
> Ke7 6.Qb7+ Kd8 7.Rxd3 Qe4+ 8.Kg1 Qxd3 9.Qxh7
> {-80}
> 2103022 2.277 -2.72 9++ 1...Kf8 2.Qf6+ Ke8 3.Qc6+ Kd8 4.Qd6+ Ke8 5.Qb8+
> Ke7 6.Qb7+ Kd8 7.Rxd3 Qe4+ 8.Kg1 Qxd3 9.Qxh7
> {-80}
> 3079136 3.364 -1.07 9t 1...Kf8 2.Qf6+ Ke8 3.Qc6+ Ke7 4.Qc5+ Ke6 5.Qb6+
> Ke7 6.Qa7+ Kd8 7.Qa5+ Ke7 8.Rxd3 Qe4+ 9.Kg1
> Qxd3 10.Qxa4 Qd1+H 11.Kg2H {HT}
> 5301666 6.155 -1.06 9t+ 1...Kh8 2.Qf6+ Kg8 3.Qd8+ Kg7 4.Qd7+ Kh8 5.Qe8+
> Kg7 6.Qe7+ Kg8 7.Rxd3 Qe4+ 8.Kg1 Qxd3 9.Qd8+
> Kg7 10.Qd7+ Kf8 11.Kf2 d4 12.e6H Qe3+H 13.Kf1H
> {HT} {0}
> 7312547 8.612 -0.22 9t 1...Kh8 2.Qf6+ Kg8 3.Rxd3 Qe1+ 4.Kg2 Qe2+ 5.Kg1
> Qxd3 6.e6 Qd1+ 7.Kf2 Qd2+ 8.Kg3 Qe3+ 9.Kg4 Qe4+
> 10.Kh3 Qe3+H 11.Kh4H Qe4+H 12.Kh3H Qe3+H
> 13.Kh4H Qe4+H 14.Kh3HR {0}
> 7313418 8.613 -0.22 9. 1...Kh8 2.Qf6+ Kg8 3.Rxd3 Qe1+ 4.Kg2 Qe2+ 5.Kg1
> Qxd3 6.e6 Qd1+ 7.Kf2 Qd2+ 8.Kg3 Qe3+ 9.Kg4 Qe4+
> 10.Kh3 Qe3+ 11.Kh4 Qe4+ 12.Kh3 Qe3+ 13.Kh4 Qe4+
> 14.Kh3 {0}
> 11069778 13.189 0.00 10t 1...Kh8 2.Qf6+ Kg8 3.Rxd3 Qe1+ 4.Kg2 Qe2+ 5.Kg1
> Qxd3 6.e6 Qd1+ 7.Kf2 Qd2+ 8.Kg3 Qe3+ 9.Kg4 Qe4+
> 10.Kh3 Qd3+ 11.Kh4 Qe4+H 12.Kh3H Qd3+H 13.Kh4H
> Qe4+H 14.Kh3HR {0}
> 11241534 13.387 0.00 10. 1...Kh8 2.Qf6+ Kg8 3.Rxd3 Qe1+ 4.Kg2 Qe2+ 5.Kg1
> Qxd3 6.e6 Qd1+ 7.Kf2 Qd2+ 8.Kg3 Qe3+ 9.Kg4 Qe4+
> 10.Kh3 Qd3+ 11.Kh4 Qe4+ 12.Kh3 Qd3+ 13.Kh4 Qe4+
> 14.Kh3 {0}
> 20221775 24.540 0.00 11t 1...Kh8 2.Qf6+ Kg8 3.Rxd3 Qe1+ 4.Kg2 Qe2+ 5.Kg1
> Qxd3 6.e6 Qd1+ 7.Kf2 Qd2+ 8.Kg3 Qe3+ 9.Kg4 Qe4+
> 10.Kh3 Qd3+ 11.Kh4 Qe4+ 12.Kh3 {0}
> 21083787 25.591 0.00 11. 1...Kh8 2.Qf6+ Kg8 3.Rxd3 Qe1+ 4.Kg2 Qe2+ 5.Kg1
> Qxd3 6.e6 Qd1+ 7.Kf2 Qd2+ 8.Kg3 Qe3+ 9.Kg4 Qe4+
> 10.Kh3 Qd3+ 11.Kh4 Qe4+ 12.Kh3 {0}
> 45305235 56.711 0.00 12t 1...Kh8 2.Qf6+ Kg8 3.Rxd3 Qe1+ 4.Kg2 Qe2+ 5.Kg1
> Qxd3 6.e6 Qd1+ 7.Kf2 Qd2+ 8.Kg3 Qe3+ 9.Kg4 Qe4+
> 10.Kh3 Qd3+ 11.Kh4 Qe4+ 12.Kh3 {0}
> 49212453 1:01.9 0.00 12. 1...Kh8 2.Qf6+ Kg8 3.Rxd3 Qe1+ 4.Kg2 Qe2+ 5.Kg1
> Qxd3 6.e6 Qd1+ 7.Kf2 Qd2+ 8.Kg3 Qe3+ 9.Kg4 Qe4+
> 10.Kh3 Qd3+ 11.Kh4 Qe4+ 12.Kh3 {0}
>
>Regards,
>Dieter
Wow!
Robin
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