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Subject: Re: Very easy mate to solve.

Author: Heiner Marxen

Date: 16:41:52 12/28/01

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On December 27, 2001 at 21:51:56, leonid wrote:

>
>Hi, Heiner!
>
>>>Just look into fact that with new depth procedure of search will be changed.
>>>Specialized files, for instance, will be at new depth. Somewhere it can bring
>>>different search sequence and with it even better time for higher depth.
>>
>>Aah!  Yes, you have a point, here.
>
>I tried today last position once again but starting this time search from 3
>moves like, (3 4 5...). When before it was, (4 5 6...). Now I could see that
>previous time for your program was wrong and your specilized plys work much,
>much better that I could see previously. Fantastic!!!!! When before I found 0.11
>sec for 4 moves, now I could see 0.0 sec.
>
>This finding could signify that my guessing about ten fold possible speeding of
>mate solver is very sober expectation. It reality, it could be much higher.
>
>In the next position that I wrote yesterday, old tendency is more that present.
>Our speed for 4 moves (all condition are the same) is around 9 times in your
>favor. Mine at 4 moves is 0.44 sec. and your 0.05 sec. Even if mine have here
>chance to have somehow better branching factor it reach your time only at 9
>moves. Initial speed is really vital.
>
>[D]3k4/3qqqrp/N1qq3R/NQ1Q3q/n2qNRPQ/n7/B6b/BqQrQbQK w - -
>
>My time in general:
>
>Move            Time            Branching factor            NPS.
>
>4               0.439 sec                                   38k
>                                4.87
>5               2.14 sec                                    36k
>                                4.64
>6               9.94 sec                                    36k
>                                5.3
>7               52.8 sec                                    49k
>                                4.69
>8               4 min 8 sec                                 57k
>                                8.52
>9               35 min 13 sec                               64k
>
>Mate found in 10 moves at 1 hour 53 min.

Interesting.  My timing is:
#  4      0.09s [  4.50]        5kN [  5.24]  1.03        463-         0
#  5      0.42s [  4.67]       26kN [  5.54]  1.29       1786-         0
#  6      3.49s [  8.31]      189kN [  7.39]  1.51      16848-         0
#  7     23.41s [  6.71]     1187kN [  6.27]  1.80     130157-         0
#  8    146.17s [  6.24]     7333kN [  6.18]  2.13     871820-         0
#  9    783.47s [  5.36]    39167kN [  5.34]  2.66    4764548-     22074
# 10   5019.44s [  6.41]   242350kN [  6.19]  2.86   30197115-  21449215

Our NPS is nearly equal.  My inital speed is clearly better: when you have done
depth 4, Chest has completed depth=5, already.  But although you do not use
any hash, your EBF is better from 6 to 7 and to 8, while mine is better
from depth 8 to 9.

This may be due to luck, but it makes me curious: how do you manage such a
good EBF?  How do you select black moves?  I know we both prefer checking
moves, generally, but is there more to it in your program?
Chest uses a really complicated function to order the black moves.
You seem to be quite good in this respect, also.

Cheers,
Heiner



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