Author: Terry McCracken
Date: 14:20:27 04/19/02
Go up one level in this thread
On April 19, 2002 at 16:08:23, John Merlino wrote: >On April 19, 2002 at 15:39:39, Terry McCracken wrote: > >>On April 19, 2002 at 14:07:13, John Merlino wrote: >> >>>This position came up in a game between myself and a friend: >>> >>>[D]6k1/5R2/7P/6K1/8/8/p5P1/6r1 w - - 0 1 >>> >>>The question is: can White draw (after 1.h7+ Kxf7 2.h8=Q a1=Q)? >>> >>>Chessmaster says this, but I suspect that the eval is simply because of the >>>difference in material (not the steadily dropping score): >>> >>>Time Depth Score Positions Moves >>>0:00 2/3 -2.25 978 1.Ra7 a1=Q 2.h7+ Kh8 3.Rxa1 Rxa1 >>>0:00 3/4 -2.25 2266 1.Ra7 a1=Q 2.h7+ Kh8 3.Rxa1 Rxa1 >>>0:00 4/5 -2.63 6103 1.Ra7 a1=Q 2.Rxa1 Rxa1 3.g4 Ra5+ >>> 4.Kg6 Ra6+ 5.Kg5 >>>0:00 4/5 -2.60 7857 1.Rg7+ Kh8 2.Ra7 a1=Q 3.Rxa1 Rxa1 >>> 4.g4 Kh7 >>>0:00 5/6 -2.60 16712 1.Rg7+ Kh8 2.Ra7 a1=Q 3.Rxa1 Rxa1 >>> 4.g4 Kh7 >>>0:00 6/7 -4.04 45865 1.Rg7+ Kh8 2.Ra7 a1=Q 3.Rxa1 Rxa1 >>> 4.Kg6 Rg1 5.Kf5 Rxg2 >>>0:01 7/8 -4.66 145818 1.Rg7+ Kh8 2.Ra7 a1=Q 3.Rxa1 Rxa1 >>> 4.g4 Kh7 5.Kf4 Ra4+ 6.Kf5 Ra5+ >>> 7.Kf6 Kxh6 >>>0:02 7/8 -4.01 229288 1.h7+ Kxf7 2.h8=Q a1=Q 3.Qh5+ Kf8 >>> 4.Qf3+ Ke7 5.Qe4+ Kd6 6.Qg6+ Kc5 >>> 7.Qf5+ Kc4 8.g4 >>>0:04 8/9 -4.02 414062 1.h7+ Kxf7 2.h8=Q a1=Q 3.Qh5+ Kf8 >>> 4.Qf3+ Ke7 5.Qe4+ Kd6 6.Qg6+ Kc5 >>> 7.Qf5+ Kd4 8.Qg4+ Kd5 9.Kh4 >>>0:09 9/10 -3.93 898261 1.h7+ Kxf7 2.h8=Q a1=Q 3.Qh5+ Kf8 >>> 4.Qf3+ Ke7 5.Qe4+ Kd6 6.Qg6+ Kc5 >>> 7.Qf5+ Kd4 8.Qf6+ Kd3 9.Qg6+ Kc4 >>> 10.g4 >>>0:20 10/11 -3.76 2026714 1.h7+ Kxf7 2.h8=Q a1=Q 3.Qh5+ Kf8 >>> 4.Qf3+ Ke7 5.Qe4+ Kd6 6.Qg6+ Kc5 >>> 7.Qf5+ Kc6 8.Qe6+ Kc7 9.Qf7+ Kc8 >>> 10.Qf8+ Kb7 11.Qf7+ Kb6 >>>0:49 11/12 -3.63 4752637 1.h7+ Kxf7 2.h8=Q a1=Q 3.Qh5+ Kf8 >>> 4.Qf3+ Ke7 5.Qe4+ Kd6 6.Qg6+ Kc5 >>> 7.Qf5+ Kc6 8.Qe6+ Kc7 9.Qf7+ Kc8 >>> 10.Qe6+ Kb7 11.Qd7+ Ka6 12.Qd5 >>>1:39 12/13 -3.53 10149051 1.h7+ Kxf7 2.h8=Q a1=Q 3.Qh5+ Kf8 >>> 4.Qf3+ Ke7 5.Qe4+ Kd6 6.Qg6+ Kc5 >>> 7.Qf5+ Kc6 8.Qe6+ Kc7 9.Qf7+ Kc8 >>> 10.Qf8+ Kb7 11.Qe7+ Kb8 12.Qd8+ >>> Ka7 13.Qc7+ Ka6 >>>4:01 13/14 -3.42 25036829 1.h7+ Kxf7 2.h8=Q a1=Q 3.Qh5+ Kf8 >>> 4.Qf3+ Ke7 5.Qe4+ Kd6 6.Qg6+ Kc5 >>> 7.Qf5+ Kc6 8.Qe6+ Kc7 9.Qf7+ Kb6 >>> 10.Qe6+ Kb5 11.Qd5+ Kb4 12.Qe4+ >>> Kc3 13.Qe5+ Kc2 14.Qd5 >>>7:53 14/15 -3.35 50033731 1.h7+ Kxf7 2.h8=Q a1=Q 3.Qh5+ Kf8 >>> 4.Qf3+ Ke7 5.Qe4+ Kd6 6.Qg6+ Kc5 >>> 7.Qf5+ Kc6 8.Qe6+ Kc7 9.Qf7+ Kc8 >>> 10.Qf8+ Kb7 11.Qf7+ Kb6 12.Qg6+ >>> Kb5 13.Qd3+ Kc6 14.Qg6+ Kd5 15.Kf4 >>> >>>jm >> >>I'm just curious John, who had the White pieces and how did the game end? >>Did White get a draw, or let it slip away into a loss? >> >>There is no question about it that 1.h7+!! is not only the "Best" move but a >>"Forced" move as well. >> >>Everthing else loses quikly! >> >>Terry > >White resigned in this position. I was Black. This should show you the quality >of our play here at the CM offices. ;-) > >jm LOL! Thanks, however it's not so easy to see this draw accurately over the board, so your opponant shouldn't feel too bad for missing the draw. Nor you if you missed it! I know I'd have to think hard to keep the King in check!;) Here's a position, which is easy for computers for about 15 years well before 5 and 6 man EGTB's or 4 in this case on micros. My old Mach III Master finds the drawing move instantly but needs to run to about 16 ply to see the draw is forced. Never even bothered to give this problem to modern chess programmes with or without tablebases. In this position White is to move and can draw, I'll quote an excerpt from Technique in Chess by Gerald Abrahams, copyright 1961. Opps....I hope I'm not in trouble for doing this!;) I remember solving this problem 21 years ago, when first learning the game. I think at the time it took me 20 min. to see all variations, not too bad for a beginner!:o) Now it looks like child's play, yet it does stump most beginners and even some good players who don't fully understand King and Pawn endings. I find it amusing when the "truth" is buried in such a simple pawn ending:o) Oh White was a master if I'm not mistaken?:o)) "The Rocket-propelled King" A study by Richard Reti. The position in the diagram was actually reached, in 1921, in a game played in Berlin. White confidently resigned. It was left to the genius of Reti to discover the draw. The King is terribly far from the Black pawn, and is far too slow to catch it in an ordinary way; but there is something in this position that seems to accelerate it tremendously. [D]7K/8/k1P5/7p/8/8/8/8 - - w Please no computers! Unless they are micros over 15 years old;) Terry
This page took 0 seconds to execute
Last modified: Thu, 15 Apr 21 08:11:13 -0700
Current Computer Chess Club Forums at Talkchess. This site by Sean Mintz.