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Subject: Re: Good Move by Kasparov

Author: Sune Fischer

Date: 06:13:26 03/30/02

Go up one level in this thread


On March 30, 2002 at 08:50:50, Gian-Carlo Pascutto wrote:

>On March 30, 2002 at 08:48:31, Art Basham wrote:
>
>>White played Bxg6..!!
>>
>>[D]r3r1k1/pp2b2p/1q2p1pB/1b2N2n/8/P7/1P3PP1/RB2QRK1 w - -
>>
>>Rebel 10 finds it at just 5 ply ...!
>
>Easy...
>
>Sjeng: go
>Middlegame phase.
>Time for move : 1000000
> 2     -97     0      324  Be3 Qc7
> 2     -85     0      498  Bd3 Bxd3 Nxd3
> 2     -85     0      713  Bd3 Bxd3 Nxd3
> 3    -113     0     1217  Bd3 Bxd3 Nxd3 Rac8
> 3    -113     1     5094  Bd3 Bxd3 Nxd3 Rac8
> 4    -138     1     7123  Bd3 Bxd3 Nxd3 Ng3 Be3
> 4    -138     3    14664  Bd3 Bxd3 Nxd3 Ng3 Be3
> 5    -150     4    21613  Bd3 Bxd3 Nxd3 Ng3 Be3 Qd8
> 5     -88     9    37505  Bxg6 !!
> 5     -72    16    64425  Bxg6 hxg6 Qe4 Ng7 Qxg6 Bf8 <Rfd1>
> 5     -72    20    81728  Bxg6 hxg6 Qe4 Ng7 Qxg6 Bf8 <Rfd1>
> 6     -58    28   108749  Bxg6 hxg6 Qe4 Bf8 Qxg6+ Ng7 Qf7+ Kh8 Rfd1 Rac8
> 6     -58    35   134711  Bxg6 hxg6 Qe4 Bf8 Qxg6+ Ng7 Qf7+ Kh8 Rfd1 Rac8
> 7     -64    57   219161  Bxg6 hxg6 Qe4 Bf8 Qxg6+ Ng7 Qf7+ Kh7 Rfd1 Be2 Qg6+ Kg
>                       8 <Rd7>
> 7     -64    84   362986  Bxg6 hxg6 Qe4 Bf8 Qxg6+ Ng7 Qf7+ Kh7 Rfd1 Be2 Qg6+ Kg
>                       8 <Rd7>
> 8     -14   123   543307  Bxg6 !!
> 8       0   161   696870  Bxg6 hxg6 Qe4 Bf8 Qxg6+ Ng7 Qf7+ Kh7 Qg6+ Kh8 Bxg7+ B
>                       xg7 Nf7+ Kg8 Nh6+ Kh8 Nf7+ <Kg8> <Nh6+> <Kh8> <Nf7+>
><Kg8> <Nh6+> <Kh8>
> 8       0   216   915834  Bxg6 hxg6 Qe4 Bf8 Qxg6+ Ng7 Qf7+ Kh7 Qg6+ Kh8 Bxg7+ B
>                       xg7 Nf7+ Kg8 Nh6+ Kh8 Nf7+ <Kg8> <Nh6+> <Kh8> <Nf7+>
><Kg8> <Nh6+> <Kh8>
> 9      50   390  1512041  Bxg6 !!
> 9     346  2033  7369532  Bxg6 Rf8 Bxh5 Bxf1 Qxf1 Qxb2 Bxf8 Rxf8 Nd7 Rf5 Rb1
> 9     346  2072  7565404  Bxg6 Rf8 Bxh5 Bxf1 Qxf1 Qxb2 Bxf8 Rxf8 Nd7 Rf5 Rb1
>10     313  3636 13271374  Bxg6 Rf8 Bxh5 Bxf1 Bxf8 Rxf8 Qxf1 Rxf2 Qxf2 Bc5 Rf1
>Bxf2+ Rxf2 Qd4
>10     313  3813 13937451  Bxg6 Rf8 Bxh5 Bxf1 Bxf8 Rxf8 Qxf1 Rxf2 Qxf2 Bc5 Rf1
>Bxf2+ Rxf2 Qd4
>
>--
>GCP


Hmm, must improve...:
depth=8 -1.03 1.Bd3 Bxd3 2.Nxd3 Rd8 3.Rd1 Rd5 4.Be3 Qc6
depth=9 -1.91 1.Bd3 Bxd3 2.Nxd3 Rd8 3.Qc3 Qb5 4.Nb4 Bf6 5.Qe3 Bxb2

My new version of ChessCraft is blind as a bat, how deep is this line anyway,
I'm not using any extensions other than regular q-search.

But all hope is not lost, I think it has a bug, in this position it wants to
play: Ka1?????

[D]4k3/7p/1r2pQ1P/8/p1p5/P1P1R3/K3B3/8 w - - bm Rxe6!

depth=9 +14.84 1.Ka1 Kd7 2.Bxc4 Rd6 3.Bxe6 Kc6 4.Re1 Kb5 5.Qf4

That has to be a bug right, it seems 2 ply deep, funny thing is, it was actually
able to reach this clearly won position, so I have no idea what's going on.
Any tips as to how I should debug the search?

-S.




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