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Subject: Re: How long does it take your program to find this simple mate in 4?

Author: Jeremiah Penery

Date: 22:47:29 02/10/00

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On February 11, 2000 at 01:09:50, Dann Corbit wrote:

>On February 11, 2000 at 01:02:25, Jeremiah Penery wrote:
>>On February 10, 2000 at 19:48:08, Dann Corbit wrote:
>[snip]
>>>Chest.  Took quite a while, but the machine was busy doing stuff.
>>>
>>>E:\crafty\Release>chest319 -b -z 11 epd.epd
>>>6n1/qp2b3/1p4K1/p4N2/2B2k1p/4pP2/4p2P/4N3 w - - acn 403261928; acs 15956; bm
>>>Nd4; ce 32746; dm 11; pv Nd4 Ke5 Nb5 Kf4 Bd5 Ke5 Bxg8 Kf4 Bd5 Ke5 Bc4 Kf4 Nd4
>>>Ke5 Nf5 Kf4 h3 b5 Nd3+ Kxf3 Bd5#;
>>
>>My modified Crafty 17.7 finds this in just over 11 minutes (on a semi-busy
>>machine):
>>
>>16    11:14  Mat11   1. Nd4 Ke5 2. Nb5 Kf4 3. Bd5 Ke5 4.
>>                     Bxg8 Kf4 5. Bd5 Ke5 6. Bc4 Kf4 7. Nd4
>>                     Ke5 8. Nf5 Kf4 9. h3 Ba3 10. Nd3+ Kxf3
>>                     11. Bd5#
>
>That's pretty amazing.  Do you have a complete list of the modifications that
>you make?
>
>Do you know a reason why it finds the mate so fast?

How fast does the regular Crafty find it (I have a PII-300)?

I can send you my source if you want, to compare.  I don't think I changed that
much in this one, actually...



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