Author: Roy Eassa
Date: 12:09:07 06/18/02
Go up one level in this thread
On June 18, 2002 at 14:16:13, John Merlino wrote:
>On June 18, 2002 at 12:30:13, Charlie GOLD wrote:
>
>> Here is a position that I gave to Fritz 6. After 7 minutes on infinite it
>>only comes up with Rxf4. I believe that Rxh5 leads to a win.
>> [D] 4r1k1/qp1r1p2/2pb1Bp1/p6p/2PP1n1R/1P3P2/P4P2/2Q2K1R w 0 1
>
>Guess what, folks. Qxf4 is the best move!!! Chessmaster 9000 announces Mate in
>10 for Qxf4 in 25 seconds on a PIII-600:
>
>Time Depth Score Positions Moves
>0:00 1/3 -1.80 2438 1.Rxf4 Bxf4 2.Qxf4 Re6 3.Be5 b6
>0:00 1/4 -1.26 7609 1.Rxf4 Bxf4 2.Qxf4 Re6 3.Be5 Kh7
> 4.Qg5
>0:00 2/5 -1.26 24204 1.Rxf4 Bxf4 2.Qxf4 Re6 3.Be5 Kh7
> 4.Qg5
>0:02 2/6 -1.43 113961 1.Rxf4 Re6 2.Rf5 Rxf6 3.Rxf6 Qxd4
> 4.Qg5 Be5
>0:02 2/6 1.34 148059 1.Rxh5 gxh5 2.Qxf4 Re1+ 3.Kxe1
> Re7+ 4.Be5 Bxe5 5.Qg5+ Kf8 6.dxe5
>0:03 3/7 2.28 229134 1.Rxh5 gxh5 2.Qxf4 Re1+ 3.Kxe1
> Re7+ 4.Be5 Bxe5 5.dxe5 Rd7 6.Qg5+
> Kf8 7.Rxh5
>0:11 3/8 9.09 789648 1.Rxh5 gxh5 2.Qxf4 Re1+ 3.Kxe1
> Re7+ 4.Kf1 Re1+ 5.Kxe1 Bb4+ 6.Kf1
> Kf8 7.Rxh5
>0:15 3/8 13.43 1118477 1.Qxf4 Re1+ 2.Kxe1 Bxf4 3.Rxh5
> Re7+ 4.Kf1 Re1+ 5.Kxe1 Bd2+ 6.Kxd2
> gxh5 7.Rxh5 Qxd4+ 8.Bxd4 Kf8 9.Rxa5
> Ke7
>0:25 4/9 Mate10 2173987 1.Qxf4 Re1+ 2.Kg2 Rg1+ 3.Kxg1 Qc5
> 4.Rxh5 gxh5 5.Qh6 Qg5+ 6.Qxg5+
> Kf8 7.Qg8+ Kxg8 8.Rxh5 Bh2+ 9.Rxh2
> Kf8 10.Rh8#
>0:31 4/10 Mate10 2759618 1.Qxf4 Re1+ 2.Kg2 Rg1+ 3.Kxg1 Qc5
> 4.Rxh5 gxh5 5.Qh6 Qg5+ 6.Qxg5+
> Kf8 7.Qg8+ Kxg8 8.Rxh5 Bh2+ 9.Rxh2
> Kf8 10.Rh8#
>0:45 5/11 Mate10 4504935 1.Qxf4 Re1+ 2.Kg2 Rg1+ 3.Kxg1 Qc5
> 4.Rxh5 gxh5 5.Qh6 Qg5+ 6.Qxg5+
> Kf8 7.Qg8+ Kxg8 8.Rxh5 Bh2+ 9.Rxh2
> Kf8 10.Rh8#
>
>Note that this is a shorter mate than any other engine has announced, and faster
>too. Additionally, after forcing 1.Rxh5, it appears that this move leads to Mate
>in 11, one move longer than 1.Qxf4:
>
>Time Depth Score Positions Moves
>0:00 1/3 -3.28 2537 1...gxh5 2.Rxh5 Re1+ 3.Kxe1 Nxh5
> 4.Qg5+ Kf8 5.Qxh5
>0:00 1/4 -3.35 7089 1...gxh5 2.Rxh5 Re1+ 3.Kxe1 Nxh5
> 4.Qg5+ Kf8 5.Qxh5 Ke8
>0:00 2/5 -3.09 15678 1...gxh5 2.Rxh5 Re1+ 3.Kxe1 Nxh5
> 4.Qg5+ Kf8 5.Qxh5 Bb4+ 6.Kf1 Ke8
>0:00 2/6 1.34 36917 1...gxh5 2.Qxf4 Re1+ 3.Kxe1 Re7+
> 4.Be5 Bxe5 5.Qg5+ Kf8 6.dxe5
>0:01 3/7 2.28 86802 1...gxh5 2.Qxf4 Re1+ 3.Kxe1 Re7+
> 4.Be5 Bxe5 5.dxe5 Rd7 6.Qg5+ Kf8
> 7.Rxh5
>0:02 3/8 2.22 187299 1...gxh5 2.Qxf4 Re1+ 3.Kxe1 Re7+
> 4.Be5 Bxe5 5.dxe5 Qc5 6.Qg5+ Kf8
> 7.Rxh5
>0:05 4/9 16.55 466827 1...gxh5 2.Qxf4 Re1+ 3.Kxe1 Re7+
> 4.Kf1 Re1+ 5.Kxe1 Bb4+ 6.Kd1 Kf8
> 7.Re1 Qxd4+ 8.Qxd4
>0:23 4/10 Mate09 2147897 1...gxh5 2.Qxf4 Re1+ 3.Kg2 Rg1+
> 4.Kxg1 Qc5 5.Qh6 Qg5+ 6.Qxg5+ Kf8
> 7.Rxh5 Ke8 8.Rh8+ Bf8 9.Qe5+ Re7
> 10.Qxe7#
>0:50 4/10 Mate11 4833997 1...Re1+ 2.Kxe1 gxh5 3.Qxf4 Re7+
> 4.Kf1 Qxd4 5.Rxh5 Re1+ 6.Kxe1 Bb4+
> 7.Ke2 Qb2+ 8.Bxb2 Kf8 9.Rh8+ Ke7
> 10.Bf6+ Kd7 11.Rd8+ Ke6 12.Qe5#
>1:33 5/11 Mate10 9953817 1...Re1+ 2.Kxe1 gxh5 3.Qxf4 Bb4+
> 4.Kf1 Rxd4 5.Rxh5 Rd1+ 6.Kg2 Qxf2+
> 7.Kxf2 Bc5+ 8.Ke2 Re1+ 9.Kxe1 Bb4+
> 10.Kf1 Kf8 11.Rh8#
>4:01 6/12 Mate10 27591934 1...Re1+ 2.Kxe1 gxh5 3.Qxf4 Bb4+
> 4.Kf1 Rxd4 5.Rxh5 Rd1+ 6.Kg2 Qxf2+
> 7.Kxf2 Bc5+ 8.Ke2 Re1+ 9.Kxe1 Bb4+
> 10.Kf1 Kf8 11.Rh8#
>
>jm
By George, I think you've got it. Some analysis:
1.Qxf4! Re1+
[1...Bxf4 2.Rxh5]
2.Kg2
[or 2.Kxe1 Bb4+
(2...Bxf4 3.Rxh5 gxh5 4.Rxh5 Re7+ 5.Kf1 Re1+ 6.Kxe1 Bd2+ 7.Kf1 Bh6
8.Rxh6 Qxd4 9.Rh8#)
(2...Re7+ 3.Kf1 Re1+ 4.Kxe1 Bb4+ 5.Kf1 Qxd4 6.Qxd4 Bf8 7.Qd8 b5
8.Rxh5 gxh5 9.Rxh5 bxc4 10.Rh8#)
3.Kf1 Qxd4 4.Rxh5 Qd3+ 5.Kg2 gxh5 6.Rxh5 Qf1+ 7.Kxf1 Rd1+ 8.Kg2 Rg1+
9.Kxg1 b5 10.Rh8#]
2...Qc5
[2...Qxd4 3.Rxh5 Qxf2+ 4.Kxf2 Rxh1 5.Rxh1 Bc5+ 6.Kg2 Rd2+ 7.Qxd2 Bb4
8.Rh8#]
[2...Rg1+ 3.Kxg1 Qxd4
(3...Qc5 transposes)
4.Rxh5 Qxf6 5.Qxf6 Bh2+ 6.R5xh2 Rd1+ 7.Kg2 Rg1+ 8.Kxg1 b6 9.Rh8#]
3.Rxh5 Rg1+
[3...gxh5 4.Qh6 Qg5+ 5.Qxg5+ Kf8 6.Qg8+ Kxg8 7.Rxh5 Rg1+ 8.Kxg1 Bh2+
9.Kh1 Be5 10.Rh8#]
4.Kxg1 gxh5 5.Qh6 Qg5+ 6.Qxg5+ Kf8 7.Qg8+ Kxg8 8.Rxh5 Bh2+ 9.Kh1 Be5 10.Rh8#
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