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Subject: Re: Is this queen sacrifice sound? (OT)

Author: Uri Blass

Date: 00:24:37 01/07/06

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On January 06, 2006 at 19:07:39, Robin Smith wrote:

>On January 06, 2006 at 05:37:44, Vincent Lejeune wrote:
>
>>
>>BTW, I prepare some other very hard test positions mainly from CCC archives.
>>I've about 25 positions now , I'll post them next week.
>>
>>May be Rybka Winfinder will show some surprising results here...
>
>Here is another position for your database.
>[D] r1qr2k1/pb2bpp1/1p2p2p/2p4n/3P1B2/2PB1N2/PP2QPP1/1K1R2R1 w - - 0 16 bm
>16.Bxh6
>
>This is from a correspondence game I played many years ago. It would be
>interesting to see how programs do today, but when I tried Rybka Winfinder on it
>using my 2 year old laptop it still was not solved after several hours. The
>position 1 move earlier is absurdly hard for computers.
>
>-Robin

I do not have rybka winfinder but maybe rybka slightly positional is better
here.

with 512 mbytes hash
After more than 30 minutes of analysis it considers Bxh6 at least in the last 12
minutes(it does not choose this move but I see it in the analysis window for a
long time)

New game
[D]r1qr2k1/pb2bpp1/1p2p2p/2p4n/3P1B2/2PB1N2/PP2QPP1/1K1R2R1 w - - 0 1

Analysis by Rybka 1.0 Beta 32-bit:

1.Bd2
  =  (0.05)   Depth: 3   00:00:00
1.Bd2
  =  (-0.12)   Depth: 4   00:00:00
1.Be3
  =  (-0.04)   Depth: 4   00:00:00
1.Be3 Nf6
  =  (0.01)   Depth: 5   00:00:00
1.Be3 Nf6 2.Ne5
  =  (0.00)   Depth: 6   00:00:00  11kN
1.Be3 Qc7 2.Ne5 Nf6
  =  (-0.14)   Depth: 7   00:00:00  27kN
1.Be3 Qc7 2.Ne5 Nf6 3.Rh1
  =  (-0.19)   Depth: 8   00:00:01  61kN
1.Bd2 Qc7 2.Ne5 Nf6 3.dxc5
  =  (-0.06)   Depth: 8   00:00:02  107kN
1.Bd2 Qc7 2.Ne5 Nf6 3.Bf4 cxd4
  =  (-0.24)   Depth: 9   00:00:02  155kN
1.Be3 Qc7 2.g3 Nf6 3.dxc5 bxc5 4.Bf4
  =  (-0.22)   Depth: 9   00:00:03  191kN
1.Be5 Nf6 2.g4 Nd7 3.Bf4 Qc6
  =  (-0.16)   Depth: 9   00:00:05  268kN
1.Be5 Nf6 2.g4 Nd5 3.Rh1 Qc6 4.Rh3
  =  (-0.20)   Depth: 10   00:00:10  502kN
1.Bh2 Nf6 2.g4 Bxf3 3.Qxf3 cxd4 4.cxd4 Nd5 5.Be5
  =  (-0.08)   Depth: 10   00:00:15  741kN
1.Bh2 Nf6 2.g4 Bxf3 3.Qxf3 cxd4 4.cxd4 Nd5 5.Qe4 g6
  =  (-0.13)   Depth: 11   00:00:17  869kN
1.Bh2 Nf6 2.g4 Bxf3 3.Qxf3 cxd4 4.cxd4 Nd5 5.Qe4 g6
  =  (-0.16)   Depth: 12   00:00:26  1336kN
1.Be5 Nf6 2.g4 Nd7 3.Bf4 Qc6 4.Rg3 c4 5.Bxc4
  =  (-0.05)   Depth: 12   00:00:52  2477kN
1.Be5 Qc6 2.Rh1 Nf6 3.Rh4 a5 4.Bb5 Qc8 5.Bd3 Bd5
  =  (-0.11)   Depth: 13   00:01:37  4695kN
1.Be5 Qc6 2.Nd2 Nf6 3.dxc5 bxc5 4.Bb5 Qb6 5.Bd3 Bd5
  =  (-0.17)   Depth: 14   00:03:14  9335kN
1.Bh2 Nf6 2.g4 Bxf3 3.Qxf3 cxd4 4.cxd4 Nd5 5.Qe4 g6
  =  (-0.02)   Depth: 14   00:04:30  12834kN
1.Bh2 Nf6 2.g4 Bxf3 3.Qxf3 cxd4 4.cxd4 Nd5 5.Qe4 g6
  =  (-0.13)   Depth: 15   00:05:49  16231kN
1.Bh2 Nf6 2.g4 cxd4 3.Nxd4 Nd5 4.Be5 Bg5 5.Be4 Nf4
  =  (-0.12)   Depth: 16   00:09:48  27110kN

(,  07.01.2006)







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