Author: Dieter Buerssner
Date: 13:01:52 08/11/02
Go up one level in this thread
On August 10, 2002 at 21:53:49, John Merlino wrote:
>Here is a position from a game that Slater and I discussed in a different
>thread:
>
>3R4/8/8/8/2K5/6p1/3p1rk1/8 b - - 0 78
>
>In that game, Black was obviously using EGTBs and played 78...d1=Q, leading to
>an EGTB mate in 22 moves (including the promotion). However, the more natural
>looking move, Kf1, leads to a mate in 14, as Chessmaster 9000 shows on a
>PIII-733:
>
>Time Depth Score Positions Moves
[...]
>3:06 8/12 -15.25 19391217 78...Kf1 79.Kc3 Ke1 80.Kc4 g2 81.Re8+
> Kf1 82.Rd8 g1=Q 83.Rd4 Qg8+ 84.Kc5
> Qg5+ 85.Kc4 Rf4 86.Kb3 Rxd4
>9:45 9/13 -Mate14 62576834 78...Kf1 79.Kc3 Ke1 80.Kc4 g2 81.Re8+
> Re2 82.Rd8 g1=Q 83.Rd6 Qg8+ 84.Kb4
> Qb8+ 85.Kc4 Qc7+ 86.Kb5 Re5+ 87.Kb4
> Qc5+ 88.Kb3 Re3+ 89.Rd3 Rxd3+ 90.Kb2
> Qc1+ 91.Ka2 Ra3#
>
>Note that the first capture is 23 ply away, making it very difficult
>(impossible?) to find it via tablebases. Can anybody else find the mate faster?
I already showed Yace analysis with TBs. Now without TBs, 40M hash, k6-2 475.
Yace finds a mate (also longer) in about the same time as CM. Considering the
hardware difference, one could argue, that it is faster than CM:
25686694 2:12.4 19.65 15. 78...Kf1 79.Kc3 Ke1 80.Re8+ Re2 81.Rd8 g2
82.Kc4 g1=Q 83.Rd3 Re5 84.Rxd2 Kxd2 85.Kb3 Qg4
86.Ka3 Kc2 {HT} {1501}
30384498 2:38.4 20.05 16++ 78...Kf1 79.Kc3 Ke1 80.Re8+ Re2 81.Rd8 g2
82.Kc4 g1=Q 83.Rd3 d1=Q 84.Rd5 Rc2+ 85.Kb4
33680778 3:01.1 21.05 16++ 78...Kf1 79.Kc3 Ke1 80.Rb8 d1=Q 81.Rb3
41249622 3:44.1 26.05 16++ 78...Kf1 79.Kc3 Ke1 80.Kc4 g2 81.Rd3 g1=Q
82.Kb4 d1=Q 83.Rb3
102781545 9:47.4 Mat16 16t 78...Kf1 79.Kc3 Ke1 80.Kc4 d1=Q 81.Rxd1+ Kxd1
82.Kc5 g2 83.Kd5 g1=Q 84.Ke4 Qg5 85.Kd3 {HT}
{1501}
114072584 10:39.9 Mat16 16. 78...Kf1 79.Kc3 Ke1 80.Kc4 d1=Q 81.Rxd1+ Kxd1
82.Kc5 g2 83.Kd5 g1=Q 84.Ke4 Qg5 85.Kd3 {HT}
{1501}
277618724 25:40.7 Mat13 17t 78...Kf1 79.Kc3 Ke1 80.Kc4 d1=Q 81.Rd4 Qxd4+
82.Kxd4 g2 83.Ke4 g1=Q 84.Kd4 Qg5H 85.Kc3H {HT}
{1501}
302854644 27:33.8 Mat13 17. 78...Kf1 79.Kc3 Ke1 80.Kc4 d1=Q 81.Rd4 Qxd4+
82.Kxd4 g2 83.Ke4 g1=Q 84.Kd4 Qg5 85.Kc3 {HT}
{1501}
Regards,
Dieter
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