Author: Dieter Buerssner
Date: 15:06:51 10/17/03
Go up one level in this thread
> 5R2/2K5/1pP5/4k2p/3pp3/2p4N/B4N1b/n1R1B2b w - - id BB #1217 mate in 4;
Indeed, again very tough for a short mate in a more or less "natural" position.
My current version of Yace on P4, 2.53 GHz:
1066457 1.398 18.49 8. 1.Nxh1 e3 2.Kxb6 d3 3.Bxc3+ Kd6 4.c7 Nb3 {1530}
1097288 1.433 18.89 9++ 1.Nxh1 e3 2.Kxb6 e2 3.Rxa1 c2 4.c7 c1=B 5.c8=Q
Kd6 {2441}
1289618 1.668 18.93 9t 1.Nxh1 e3 2.Kxb6 Nb3 3.Bxb3 Ke4 4.c7 Bxc7+H
5.Kxc7H Kd3H {2060}
1989257 2.747 18.94 9t+ 1.Rxa1 c2 2.Nxh1 e3 3.Kxb6 Ke4 4.c7H c1=BH
5.c8=QH d3H {HT}
2571624 3.617 19.89 9++ 1.Rxa1 b5 2.Kb6 c2 3.Nxh1 d3 4.c7 Kd4 5.c8=Q
Bc7+ 6.Qxc7 d2
3235290 4.625 22.16 9t 1.Rxa1 Bf3 2.Kxb6 h4 3.c7 Kd6 4.c8=QH Bg2H {HT}
9388998 12.240 Mat08 9++ 1.Rb1 Nb3 2.Bxb3 b5 {1360}
9666833 12.478 Mat06 9t 1.Rb1 Nb3 2.Bxb3 b5 3.Ng5 b4 4.Be6 d3H 5.Rxb4H
c2H 6.Bc3#H {1440}
9714232 12.539 Mat06 9. 1.Rb1 Nb3 2.Bxb3 b5 3.Ng5 b4 4.Be6 d3 5.Rxb4 c2
6.Bc3# {1440}
10150451 12.849 Mat06 10t 1.Rb1 Nb3 2.Bxb3 b5 3.Ng5 b4 4.Be6 d3 5.Rxb4 c2
6.Bc3# {1440}
20444404 19.924 Mat05 10t+ 1.Ng5 Nb3 2.Bxb3 e3 3.Be6 Be4 4.Nfxe4 c2 5.Rf5#
{1710}
20593677 20.054 Mat05 10t 1.Ng5 Nb3 2.Bxb3 Bg2H 3.Nd3+H exd3H 4.Rf5+H
Kxf5+H 5.Kxb6H {HT} {600}
21239387 20.510 Mat05 10. 1.Ng5 Nb3 2.Bxb3 Bg2 3.Nd3+ exd3 4.Rf5+ Kxf5+
5.Kxb6 {HT} {600}
24353899 23.709 Mat05 11t 1.Ng5 Nb3 2.Bxb3 Bg2 3.Ng4+ hxg4 4.Be6 Bf3H
5.Rf5#H {1020}
26294371 24.932 Mat04 11t+ 1.Rxc3 Nb3 2.Rxb3 d3 3.Rxd3 exd3 4.Bc3# {1020}
26336819 24.972 Mat04 11t 1.Rxc3 Nb3 2.Rxb3 d3H 3.Rxd3H exd3H 4.Bc3#H
{1020}
26852990 25.295 Mat04 11. 1.Rxc3 Nb3 2.Rxb3 d3 3.Rxd3 exd3 4.Bc3# {1020}
26922452 25.346 Mat04 12t 1.Rxc3 Nb3 2.Rxb3 d3 3.Rxd3 exd3 4.Bc3# {1020}
So, 25 seconds. Depending on the verions of Yace I try - in general for my
engine the mate in 3 I posted as a followup to your ather mate in 4 (it is from
a discussion in the German CSS Forum), seems quite a bit harder. For many engine
authors, mate problems might not be too interesting, when at depth 1 or 2
already a score like +10 is seen. That of course should not sound like
critisism.
Regards,
Dieter
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