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Subject: Re: Any program see the sacrifice 14 Qxe4?

Author: Scott Gasch

Date: 09:33:50 11/20/04

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On November 20, 2004 at 06:00:10, Uri Blass wrote:

>On November 20, 2004 at 05:09:57, Scott Gasch wrote:
>
>>On November 20, 2004 at 03:24:48, Scott Gasch wrote:
>>
>>>On November 19, 2004 at 22:07:28, Cliff Sears wrote:
>>>
>>>> r1b2r1k/ppp1q1pp/2n1pb2/2P5/2BPpp2/P3PPB1/1PQ3PP/2KR2NR w - - 0 14
>>>
>>>Monsoon on a single proc 1.2ghz thought about it for a couple of ply, but lost
>>>it again.
>>>
>>
>>I left this one running while I was working tonight.  After a long thing monsoon
>>seems to get it.  (UP Athlon 1.2ghz):
>>
>> 4/8    +0.83      00:08.217    365501           Bxf4 e5 dxe5 Bxe5 Bxe5 Nxe5 Qxe
>>4 Qxc5 Rd4 Nxc4 Rxc4
>
>
>11 plies in the pv when the selective depth is only 8.
>How is it possible?

The depth 8 does not include extensions.

>
>>e3+ Kb1 Qxa3 Qd3 Qxb4+ Qb3
>>10/14   +0.23    1:58:02.875    1252779861       Qxe4 e5 exf4 exd4 Qxe7 Bxe7 Ne2
>> Bxc5 Bf2 a6 g4
>
>only depth 10/14 after more than 10^9 nodes?

This engine has some experimental ideas in it that have to do with selective
search and extensions.  They have screwed up my tree size in some positions.
Don't worry: I'm not done playing with these ideas and I haven't checked in yet.

Scott

>
>Uri



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