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Subject: Re: Stunning but Simple Fritz 8 Winning R+Pawns endgame move

Author: John Merlino

Date: 07:47:27 05/31/03

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On May 31, 2003 at 01:14:14, Brian Katz wrote:

>[D]6k1/8/4pP1R/6p1/3K2P1/7P/8/7r w
>and after White's 81.h4 !!
>[D]6k1/8/4pP1R/6p1/3K2PP/8/8/7r b
>
>Check out this Stunning but Simple Rook and Pawns endgame move by Fritz 8.
>81.Rh4... !!
>It played the move and then gave a completely winning evaluation.

I'm a little confused...is the move 81.h4 or 81.Rh4? The PGN that you gave shows
that h4 was played, so I'll assume that was the move.

Chessmaster 9000, on a P4-2.4, finds h4 in two seconds, and gives it a nice eval
after 33 seconds:

Time	Depth	Score	Positions	Moves
0:00	5/9	0.43	119437		1.Rh5 Kf7 2.h4 Rxh4 3.Ke5 Kg6 4.Kxe6
					Rh1 5.Kd5 Rxh5 6.gxh5+ Kxf6
0:01	6/10	0.30	278170		1.Rh5 Kf7 2.Rxg5 Rxh3 3.Ke5 Re3+
					4.Kf4 Kxf6 5.Rg8 Re2 6.g5+ Kf7
					7.Rd8
0:01	6/10	0.48	353200		1.Kd3 Kf7 2.Ke2 Ra1 3.h4 Ra2+ 4.Kd3
					Ra3+ 5.Kc2 gxh4 6.g5 Ra2+ 7.Kd3 Rg2
0:02	6/10	0.86	569993		1.Ke3 Kf7 2.h4 gxh4 3.g5 Re1+ 4.Kf2
					Re5 5.Rh7+ Kf8 6.Rg7 h3 7.g6
0:02	6/10	1.08	766696		1.h4 gxh4 2.g5 h3 3.Ke5 h2 4.Kd6
					e5 5.Ke7 Rf1 6.Rxh2
0:04	7/11	0.88	1098825		1.h4 gxh4 2.g5 Kf7 3.Ke5 Re1+ 4.Kf4
					Rf1+ 5.Kg4 Rg1+ 6.Kxh4 Rh1+ 7.Kg3
					Rg1+ 8.Kf4 e5+ 9.Kf5 e4 10.Kxe4
					Rxg5
0:07	8/12	0.86	1969808		1.h4 gxh4 2.g5 Kf7 3.Ke3 Re1+ 4.Kf3
					Rg1 5.Rh7+ Kg8 6.Rg7+ Kf8 7.Kf2
					Rd1 8.Rh7
0:13	9/13	0.84	3873000		1.h4 gxh4 2.g5 Kf7 3.Ke3 Re1+ 4.Kf2
					Re5 5.Rh7+ Kf8 6.Rg7 h3 7.Kg3 Re3+
					8.Kh2 Rf3
0:33	10/14	1.30	9545569		1.h4 gxh4 2.g5 Kf7 3.Rh7+ Kg6 4.Rg7+
					Kh5 5.f7 Rf1 6.g6 h3 7.Rg8 h2 8.f8=Q
					h1=Q 9.Rh8+ Kg4 10.Rxh1 Rxf8
0:59	11/15	1.36	17482639	1.h4 gxh4 2.g5 Kf7 3.Rh7+ Kg6 4.Rg7+
					Kh5 5.f7 Rf1 6.g6 h3 7.Rg8 h2 8.f8=Q
					h1=Q 9.Rh8+ Kg4 10.Rxh1 Rxf8 11.g7
2:06	12/16	1.62	37768754	1.h4 gxh4 2.g5 Kf7 3.Rh7+ Kg6 4.Rg7+
					Kh5 5.f7 Rf1 6.g6 h3 7.Rg8 h2 8.f8=Q
					h1=Q 9.Rh8+ Kg4 10.Rxh1 Rxf8 11.Rg1+
					Kh5 12.g7
4:52	13/17	1.72	88163809	1.h4 gxh4 2.g5 Kf7 3.Rh7+ Kg6 4.Rg7+
					Kh5 5.f7 Rf1 6.g6 h3 7.Rg8 h2 8.f8=Q
					h1=Q 9.Rh8+ Kg4 10.Rxh1 Rxf8 11.Rg1+
					Kh5 12.g7 Rg8

jm



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