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Subject: Re: Find a mate.

Author: Heiner Marxen

Date: 10:35:36 08/05/02

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On August 03, 2002 at 08:03:46, leonid wrote:

>Hi,
>
>In next position mate for black side is almost instant and for whites 8 moves
>deeper. Position is, probably, very easy.
>
>[D]qnkNqRqB/7Q/3PnPpb/3q3P/3Q3R/3QrBqp/7P/qbKNqQrQ w - -

Yes, comparatively easy for Chest.  After 79.19 seconds on Athlon 1500+
with 350 MB hash table Chest solves as mate in 10 with a unique key move:

PV: Q3c4+ Nc6 d7+ Kc7 dxe8=N+ Kc8 Qd7+ Qxd7 Qxd7+ Kxd7 Bxc6+ Kxd8 Qhd5+ Qd6
Qxd6+ Kc8 Bxa8+ Nc7 Qdxc7#

Timing shows a really small EBF (drops below 3):

#  4      0.04s [  2.00]        6kN [  7.29]  1.06        613-         0
#  5      0.26s [  6.50]       26kN [  4.69]  1.21       3070-         0
#  6      1.01s [  3.88]       98kN [  3.72]  1.60      11559-         0
#  7      3.49s [  3.46]      335kN [  3.43]  2.38      43028-         0
#  8     10.82s [  3.10]     1087kN [  3.24]  3.51     140889-         0
#  9     29.16s [  2.70]     2945kN [  2.71]  5.18     385345-         1
# 10     79.18s [  2.72]     8036kN [  2.73]  6.52    1096332-       278

Cheers,
Heiner



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