Author: Heiner Marxen
Date: 09:40:19 04/23/03
Go up one level in this thread
On April 23, 2003 at 00:12:37, Uri Blass wrote:
>On April 22, 2003 at 15:21:24, phili_ppe wrote:
>
>>Thanks Manfred !
>>Chest for UCI is fast.
>> Here's a position (FEN)
>>
>>8/1Q6/3r4/p7/P5N1/5NPp/2K2Ppr/6bk w - - 0 1
>>
>>mate in 11
>>
>>
>>first move is 1.Qb3 !
>>
>>if 1.Qe4? then 1... Rb6 !
>
>Rb6 does not help.
>>
>>Chest says mate in 10 with Qe4, but there is the refutation above.
>
>No there is no refutation for Qe4 and it was verified also by yace.
Thanks, Uri! I feel better, now ;-)
>>Apart from that it's very good :)
>
>Chest (p850,64 Mbytes hash) says
>
>New game
>8/1Q6/3r4/p7/P5N1/5NPp/2K2Ppr/6bk w - - 0 1
>
>Analysis by ChestUCI Ver.2.3:
>
>1.Qe4 Rb6 2.Nxg1 Rb4 3.Qe6 Rxg4 4.Qxg4 Kxg1 5.Qe2 Rh1 6.g4 Kh2 7.Qe5+ Kg1 8.Kd2
>Kxf2 9.Qe3+ Kf1 10.Qe1#
> +- (#10) Depth: 10 06:24:25
>
>(, eim 23.04.2003)
>
>Uri
More detail (solution tree) about 1.Qe4 Rb6 ...
Qe4 Rb6 Nxg1 Rb4 Qe6 Rxg4 Qxg4 ...+6
Rxa4 Qe1 ...+4
Rb5 axb5 ...+3
Rc4+ Qxc4 ...+3
Rb1 Kxb1 ...+1
Rb2+ Kxb2 ...+1
Rb3 Qxb3 ...+1
Rb6 Qxb6 ...+1
Re4 Qxe4 ...+1
Rf4 gxf4 ...+1
Kxg1 Qe1#
-*- f3 ...+4
Ra6 f3 Rc6+ Qxc6 ...+3
Re6 Qxe6 ...+1
Kxg1 Qe1#
-*- Nf2+ ...+1
Rb8 f3 Rc8+ Kb2 ...+3
Rb1 Kxb1 ...+1
Rb2+ Kxb2 ...+1
Re8 Qxe8 ...+1
Kxg1 Qe1#
-*- Nf2+ ...+1
Rd6 f3 Rc6+ Qxc6 ...+3
Rd1 Kxd1 ...+1
Rd2+ Kxd2 ...+1
Re6 Qxe6 ...+1
Kxg1 Qe1#
-*- Nf2+ ...+1
Rc6+ Qxc6 Kxg1 f4 ...+2
Rg6 Qxg6 Kxg1 f4 ...+2
Rb5 axb5 a4 Qxa4 ...+1
Kxg1 Qe1#
Rb1 Kxb1 Kxg1 Qe1#
Rb2+ Kxb2 Kxg1 Qe1#
Rb3 Kxb3 Kxg1 Qe1#
Rb7 Qxb7 Kxg1 Qb1#
Re6 Qxe6 Kxg1 Qe1#
Rf6 Nxf6 Kxg1 Qe1#
Rh6 Nxh6 Kxg1 Qe1#
Kxg1 Qe1#
Cheers,
Heiner
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