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Subject: Re: Do you have pos. of truly unexpected sac. which is sound? Does it exist?

Author: martin fierz

Date: 17:11:55 11/01/02

Go up one level in this thread


On October 31, 2002 at 16:50:32, Dann Corbit wrote:

>On October 31, 2002 at 14:43:17, José Antônio Fabiano Mendes wrote:
>
>> There is a Black pawn on a7, sorry.
>> White: Granda Zuniga   Black: Seirawan, Buenos Aires 1993
>> [D]r2qkb1r/pb1p1p1p/1pn2np1/2p1p3/2P1P3/2NP1NP1/PP3PBP/R1BQ1RK1 w
>
>Here is Ruffian output:

note that Nxe5 is just a very interesting move. it is quite unclear whether it
is actually the best move. in this sense, it is a sacrifice, not just a
combination. and to me, quite unexpected and stunning!

aloha
  martin

>E:\programme\winboard\ruffian>ruffian -h 300M -t 999 -T jafm.epd
>Hash size 314572800
>Ruffian 1.0.1
>feature done=0
>Loading configuration: ruffian.cfg
>Warning: EGTB_HASH_SIZE changed, default=1048576, newvalue=8388608
>Logfile: Thu Oct 31 11:54:50 2002
>Total hash size 300M
>Initializing tablebases: /programme/winboard/nalimov
>Testing jafm.epd, 999 seconds, extra ply 3
>Testing:    Solution: Kh1
>  r2qkb1r/pb1p1p1p/1pn2np1/2p1p3/2P1P3/2NP1NP1/PP3PBP/R1BQ1RK1 w kq -
>  Depth   Time  Score    Best line
>   8/18   1.02   0.36    Nd5 Bg7 Bh3 O-O Bg5 d6 Qc2 a6
>   8-->   1.79   0.36    Nd5 Bg7 Bh3 O-O Bg5 d6 Qc2 a6
>   9/21   3.37   0.31    Nd5 Bg7 Re1 d6 a3 O-O Bg5 Nd4 Nxd4 cxd4
>   9-->   5.85   0.31    Nd5 Bg7 Re1 d6 a3 O-O Bg5 Nd4 Nxd4 cxd4
>  10/22   8.87   0.27    Nd5 Bg7 Re1 h6 Be3 O-O Qd2 g5 Qc3 Nxd5
>  10/24  18.63   x.xx    Nh4
>  10/24  20.84   0.29    Nh4 Bg7 f4 O-O fxe5 Nxe5 Bg5 Re8 Nd5 Bxd5 cxd5 Neg4
>  10/24  23.15   x.xx    Ne1
>  10/24  25.27   0.33    Ne1 Bg7 f4 O-O Nc2 Qc7 fxe5 Nxe5 Bg5 Qd6 Nd5 Nxd5
>                         cxd5
>  10-->  25.65   0.33    Ne1 Bg7 f4 O-O Nc2 Qc7 fxe5 Nxe5 Bg5 Qd6 Nd5 Nxd5
>                         cxd5
>  11/24  31.45   0.29    Ne1 Bg7 f4 O-O fxe5 Nxe5 Nf3 Re8 Nxe5 Rxe5 Bf4 Re6
>  11/24  36.83   x.xx    Nd5
>  11/24  45.37   0.30    Nd5 Bg7 Re1 O-O Bg5 d6 Qd2 Nd4 Nxd4 cxd4 Bh3 Bxd5
>                         exd5
>  11-->  58.61   0.30    Nd5 Bg7 Re1 O-O Bg5 d6 Qd2 Nd4 Nxd4 cxd4 Bh3 Bxd5
>                         exd5
>  12/28   1:22   0.29    Nd5 Bg7 Re1 O-O Bg5 d6 Qd2 Re8 Rac1 Nd4 Nxd4 Bxd5
>                         cxd5 exd4
>  12-->   2:01   0.29    Nd5 Bg7 Re1 O-O Bg5 d6 Qd2 Re8 Rac1 Nd4 Nxd4 Bxd5
>                         cxd5 exd4
>  13/30   3:45   0.26    Nd5 Bg7 a3 Nxd5 cxd5 Ne7 b4 O-O d6 Nc6 bxc5 bxc5
>                         Bg5 Bf6
>  13/30   4:08   x.xx    Ne1
>  13/30   4:14   0.27    Ne1 Bg7 f4 O-O fxe5 Nxe5 Bg5 Re8 Qd2 Rc8 Nb5 Rc6
>                         Nxa7 Rce6
>  13-->   6:26   0.27    Ne1 Bg7 f4 O-O fxe5 Nxe5 Bg5 Re8 Qd2 Rc8 Nb5 Rc6
>                         Nxa7 Rce6
>  14/33   7:44   0.31    Ne1 Bg7 f4 O-O fxe5 Nxe5 Bg5 h6 Bf4 Nh5 Bd2 Nf6 Qc1
>                         Neg4 Bf4
>  14/33  13:21   x.xx    Nh4
>
>
>Time: 16:39, cpu 95.57%, nodes 444616999, nps 445048
>Hash: 128M, used 99%, hits 24%
>EGTB: probs 0, hits 0
>
>Best move: Ne1 (0.31)  Not solved (0/1)



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