Author: Brian Katz
Date: 11:16:29 05/31/03
Go up one level in this thread
On May 31, 2003 at 10:47:27, John Merlino wrote:
>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
Hello John,
Pardon my carelessness, You are correct.. The move is h4 (Not Rh4).
Fritz finds and plays this move immediately. Here is an evaluation after 90
seconds with 512 MB Hashtables before the move 81. h4... was played.
New game
6k1/8/4pP1R/6p1/3K2P1/7P/8/7r w - - 0 1
Analysis by Fritz 8: with 512 MB Hashtables
1. +- (2.38): 1.h4 gxh4 2.g5 Kf7 3.Rh7+ Kg6 4.Rg7+ Kh5 5.g6 Rf1 6.f7 h3 7.Rg8 h2
8.g7 Kg6 9.f8Q Rd1+ 10.Ke5 Re1+
2. ² (0.63): 1.Ke4 Re1+ 2.Kf3 Rf1+ 3.Kg2 Rf4 4.Kg3 Rd4 5.h4 Rd3+ 6.Kg2 gxh4
7.Rxh4 Rd4 8.Kg3
3. ² (0.50): 1.Ke3 Rf1 2.Ke2 Rf4 3.Rg6+ Kf7 4.Rxg5 Ra4 5.Rh5 Ra2+ 6.Kf3 Ra3+
4. ² (0.38): 1.Ke5 Re1+ 2.Kd6 Kf7 3.h4 Rd1+ 4.Ke5 Re1+ 5.Kd4 Rg1 6.h5 Rd1+ 7.Ke3
Re1+ 8.Kf3 Rf1+ 9.Kg2 Rf4 10.Kg3 e5
(Brian, Eatontown 31.05.2003)
Now with only 64 MB Hashtables
New game
6k1/8/4pP1R/6p1/3K2P1/7P/8/7r w - - 0 1
Analysis by Fritz 8:
1. +- (2.38): 1.h4 gxh4 2.g5 Kf7 3.Rh7+ Kg6 4.Rg7+ Kh5 5.f7 Rf1 6.g6 h3 7.Rg8 h2
8.g7 e5+ 9.Kxe5 Kg6 10.f8Q Re1+
2. ² (0.50): 1.Ke4 Re1+ 2.Kf3 Rf1+ 3.Kg2 Rf4 4.Kg3 e5 5.Rg6+ Kf7 6.Rxg5 Kxf6
7.Rg8 Kf7 8.Rc8 Rf1 9.Rc7+ Kg6 10.Rc6+
3. ² (0.28): 1.Ke3 Kf7 2.h4 Rh3+ 3.Ke4 Rxh4 4.Rxh4 gxh4 5.g5
4. ² (0.28): 1.Ke5 Re1+ 2.Kd6 Kf7 3.h4 Rd1+ 4.Ke5 Rd5+ 5.Ke4 gxh4 6.Kf4 Rc5
7.Rxh4 Rc4+ 8.Kg5 Rc5+ 9.Kf4
(Brian, Eatontown 31.05.2003)
Fritz does see deeper into the position at 512 MB
I will now give you 90 second anlalysis after 81.h4... was played at 512 and 64
MB respectively.
New game
6k1/8/4pP1R/6p1/3K2PP/8/8/7r b - - 0 1
Analysis by Fritz 8: 512 MB Hashtables
1. +- (2.31): 1...gxh4 2.g5 Kf7 3.Rh7+ Kg6 4.Rg7+ Kh5 5.f7 Rf1 6.g6 h3 7.Rg8 h2
8.g7 Kg6
2. +- (4.19): 1...Rd1+ 2.Ke5 Re1+ 3.Kd6 Kf7 4.hxg5 Rd1+ 5.Kc7 Rc1+ 6.Kb6 Rf1
7.Kc5 Rf4 8.Rh7+ Kg8 9.Rg7+ Kf8
3. +- (5.53): 1...Kf7 2.hxg5 e5+ 3.Kxe5 Re1+ 4.Kd4 Rg1 5.Rh7+ Ke6 6.Re7+ Kd6
7.Ke4 Rf1 8.g6 Rxf6 9.g7 Kxe7 10.g8Q Re6+ 11.Kd5
4. +- (5.59): 1...e5+
(Brian, Eatontown 31.05.2003)
New game
6k1/8/4pP1R/6p1/3K2PP/8/8/7r b - - 0 1
Analysis by Fritz 8: 64 MB Hashtables
1. +- (2.31): 1...gxh4 2.g5 Kf7 3.Rh7+ Kg6 4.Rg7+ Kh5 5.f7 Rf1 6.g6 h3 7.Rg8 h2
8.g7 Kg6
2. +- (3.94): 1...Rd1+ 2.Ke5 Re1+ 3.Kd6 Kf7 4.hxg5 Rd1+ 5.Kc7 Rc1+ 6.Kb6 Rf1
7.Rh7+ Kg8 8.Rg7+ Kf8 9.Kc6 Rf3 10.Kd6
3. +- (6.09): 1...Kf7 2.hxg5 Rd1+ 3.Ke3 Rf1 4.Rh7+ Kg8 5.Rg7+ Kf8 6.Ke4 Rf2
7.Ke5 Re2+ 8.Kd6 Rf2 9.Rc7 Ra2 10.g6
4. +- (6.37): 1...e5+ 2.Kxe5
(Brian, Eatontown 31.05.2003)
After 4 minutes of analysis at 64 MB Hashtables, Fritz was showing depth=18/75
at 512 MB Hashtables, Fritz was showing depth=17/90
Thank you for your interest.
You may appreciate this next position. It is Black to move. White's last move
was Ke4... ??
[D]8/6k1/2p2p2/p1p5/P1PpKPPp/1P5P/8/8 w
[D]8/6k1/2p5/p1p2p2/P1PpKPPp/1P5P/8/8 w
This was from a real skittles game that I had played as Black about 4 years
ago. The move itself is not hard to find. I was so fascinated and impressed
with this position, that I wanted to see just how far away Black's King could be
and still win. Most strong players will find that in my actual game the shot
...f5 wins quite nicely!..................I kept setting up and playing the
position with the Black King further and further away until it started out with
the Black King on b6. I then placed Black's f pawn on f7 which is even more
deceiving.
[D]8/5p2/1kp5/p1p5/P1PpKPPp/1P5P/8/8 b
Many masters do not realize at first that Black can win with ...f5 in this
position.
[D]8/8/1kp5/p1p2p2/P1PpKPPp/1P5P/8/8 w
The win isn't quite as easy as with the Black King on g7. In Fritz' analyis,
with best play by both sides,(in the King on b6 position) both sides end up
queening, but Black will have a KQPP vs KQ.
See how long CM 9000 takes to find this move, and realize that it is winning
very big. Fritz finds it right away, but it takes a good few minutes before it
knows it is winning very big.
Shredder 6 sees this move as Winning BIG...Immediately. Some other engines find
it faster as well.
I actually showed this position (Black King on b6 and f pawn on f7 to Pal Benko
at a tournament as he was passing by and he did not see the winning move. Of
course he only looked at it for a few seconds before I showed him the move.
Arhtur Bisquier also did not see it either.
It is really a fascinating position.
Imagine playing a shot like this in an actual tournament. Your King is all the
way on the other side of the board. White almost thinks he will win at first
with g5 f5 and then g6 and promote, but the Black gets there in time. Then of
course 1.f5... will secure a draw quite easily. The Black King could never come
to deep into the White position since once the Black King gets to the 3rd rank
then g5 and g6 will win easily.
Then suddenly after waiting for Black's reply, he gets hit with the Bolt...f5!!
Show this to some of your friends. Some will be amazed. Take care for now.
Regards
Brian Katz
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