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Subject: Re: Very easy mate to solve.

Author: Heiner Marxen

Date: 13:17:57 12/23/01

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On December 22, 2001 at 09:21:12, leonid wrote:

>Hi!
>
>This one is very accessible:
>
>[D]2qQQq2/r6P/b1PqqR1N/r6B/n1BRQQ1B/q6k/q1NKNP1q/bq4qn w - -
>
>Second is almost identical but slightly deeper. I was not sure what position
>must be chosen, so I ended by putting both of them.
>
>[D]2qRQq2/p6P/q1BqqR1N/r6B/n1QNQQ1B/r6k/b1QKNP1q/bq4qn w - -

This second one was much harder for Chest.  On my K7/600 (with 30 MB hash)
it needed 15.7 hours to verfy the unique solution for the mate in 11:

PV: Q8xe6+ Qdxe6 Qff3+ Rxf3 Qxf3+ Qgg3 Nf4+ Kxh4 Qxg3+ Qxg3 Nf3+ Qxf3 Ng2+ Kh3
Qh4+ Kxg2 Bhxf3+ Kg1 Qxh1+ Kxf2 Qg2#

Here is my timing info:

#  1      0.00s                 0kN           0.87          1-         0
#  2      0.00s                 0kN           1.00          1-         0
#  3      0.02s                 2kN [ 16.87]  0.97         81-         0
#  4      0.25s [ 12.50]       17kN [ 10.28]  1.07        737-         0
#  5      2.19s [  8.76]      137kN [  7.88]  1.21       8654-         0
#  6     14.49s [  6.62]      791kN [  5.79]  1.49      66512-         0
#  7     71.55s [  4.94]     3676kN [  4.65]  2.11     351906-       503
#  8    376.68s [  5.26]    18024kN [  4.90]  2.60    2012336-   1225917
#  9   2398.57s [  6.37]   111493kN [  6.19]  2.86   13048731-  12262300
# 10  11945.63s [  4.98]   548603kN [  4.92]  3.28   67242252-  66455821
# 11  52742.57s [  4.42]  2454461kN [  4.47]  3.94  309165358- 308378927

More hash table would have helped more, but the real memory was already
bound to another Chest computation, so I was left with 30 MB.

Cheers,
Heiner



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