Author: Dieter Buerssner
Date: 08:40:10 08/31/01
Go up one level in this thread
On August 31, 2001 at 11:17:22, Gian-Carlo Pascutto wrote:
>Deeper Blues's predecessors predecessors predecessors predecessor
>already found it 4 ply _earlier_ than Yace.
With a one line change in the source (relaxing the restriction on "selective
depth"), Yace can find it at depth 6:
278715 1.774 0.00 5. 1.Rxh7+ Kxh7 2.Qh5+ Kg8 3.Rxg7+ Kxg7 4.Bh6+ Kh8
5.Bg5+ Kg8 6.Qg6+ Kh8 7.Qh5+ {-1260}
336408 2.074 0.40 6++ 1.Rxh7+ Kxh7 2.Qh5+ Kg8 3.Rxg7+ Kxg7 4.Bh6+ Kh8
5.Bg5+ Kg8 6.Qg6+ Kh8 7.Bf6+ Rxf6 8.exf6 Qxe1+
9.Kxe1 Nc2+ 10.Kd2 Rxd3+ 11.Kc1 Rd1+ 12.Kxd1
Ne7 13.fxe7 e5 {311}
1032132 4.561 Mat18 6t 1.Rxh7+ Kxh7 2.Qh5+ Kg8 3.Rxg7+ Kxg7 4.Bh6+ Kh8
5.Bg5+ Kg7 6.Qh6+ Kf7 7.Qf6+ Kg8 8.Qg6+H Kh8H
9.Bf6+H Rxf6H 10.exf6H Qxe1+H 11.Kxe1H Nc2+H
12.Kf1H Ne3+H 13.fxe3H Rd7H 14.Qe8+H Kh7H
15.Qxd7+H Ne7H 16.Qxe7+H Kh6H 17.Qg7+H Kh5H
18.Qg5#H {731}
1041441 4.639 Mat18 6. 1.Rxh7+ Kxh7 2.Qh5+ Kg8 3.Rxg7+ Kxg7 4.Bh6+ Kh8
5.Bg5+ Kg7 6.Qh6+ Kf7 7.Qf6+ Kg8 8.Qg6+ Kh8
9.Bf6+ Rxf6 10.exf6 Qxe1+ 11.Kxe1 Nc2+ 12.Kf1
Ne3+ 13.fxe3 Rd7 14.Qe8+ Kh7 15.Qxd7+ Ne7
16.Qxe7+ Kh6 17.Qg7+ Kh5 18.Qg5# {731}
John Merlino even has shown a better result.
I am however not able, to reproduce a mate in 16, that Ed has posted.
Regards,
Dieter
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