Author: Vincent Lejeune
Date: 04:50:40 11/11/04
Go up one level in this thread
On November 10, 2004 at 20:57:51, Mike Byrne wrote:
...
>White(1): [d]6r1/33P1/8/2p5/2p5/2P5/6R1/2k1K3 w
>
> white black
>1. Kf1 Kd1
>2. Kg1 Ke1
>3. Kh2! Kf1
>
>This is the critical position:
>6r1/33P1/8/2p5/2p5/2P5/6RK/5k2 w
>
>Here 4.Kh1!! must be played
...
>
>then after
>
> white black
>4. ... Ke1
>5. Kg1 Kd1
>6. Kf1 Kc1
>7. Ke1 ...
>
>we have this position (same position as above but black to move!)
>
>6r1/33P1/8/2p5/2p5/2P5/6R1/2k1K3 b
>
>this a clear and decisive win for white!
[D]6r1/6P1/8/2p5/2p5/2P5/6RK/3k4 w - - 0 1
In fact Kh1 is very strong move, it's a part a the triangulation (Kg1-h2-h1-g1)
to bring the white king on the opposition of the black king. After that it's a
quite clear win : 1. Kf1 Kd1 2. Kg1 Ke1 3. Kh2 Kd1 4. Kh1 Ke1( Kc1 and it's the
same story) 5. Kg1 Kd1 6. Kf1 Kc1 7. Ke1 Re8+ (7... Kb1 8. Kd1 1-0) 8. Kf2!
winning because white threat queening immediately and bring the king near the g
pawn (so black cannot play Kd2 as it was possible when the black rook was on g8)
Glossary : triangulation : http://chess.about.com/cs/reference/g/bldeftri.htm
opposition : http://chess.about.com/cs/reference/g/bldefopp.htm
Now, the chessengine story ...
Shredder 8 have big trouble to find Kh1! (note that the Nodes/Sec is very low
because of heavy EGTB probe, in KRPPKR , I suppose) and Hiarcs 9 find it easily
I suppose, it's, as usual, due to odd null-moves. Here I want to pride Ed
Schröder who decide to use only even number of null-moves, so we don't lose all
the triangulation subtleties in the endgame !
the logs :
Analysis by Shredder 8:
...
4.Rh3 Re1 5.Rh4 Rd1 6.Rh5 Re1 7.Rg6
+- (1.84) Profondeur: 7/10 00:00:00 2kN, tb=42
4.Rh3 Re1 5.Rh4 Rf1 6.Tg5 Re2 7.Rg4 Rd3
+- (1.68) Profondeur: 8/15 00:00:01 5kN, tb=82
4.Rh3 Re1 5.Rh4 Rf1 6.Tg3 Re2 7.Rh5 Rd2 8.Rg6
+- (1.60) Profondeur: 9/14 00:00:02 12kN, tb=187
4.Rh3 Re1 5.Rh4 Rf1 6.Tg3 Re2 7.Rh5 Rd2 8.Rg6 Te8
+- (1.65) Profondeur: 10/15 00:00:03 21kN, tb=348
4.Rh3 Re1 5.Rh4 Rf1 6.Tg5 Re2 7.Rh5 Rd3 8.Rg6 Th8 9.gxh8D
+- (1.90) Profondeur: 11/14 00:00:04 31kN, tb=503
4.Rh3 Rc1 5.Tg3
+- (1.90) Profondeur: 11/17 00:00:04 37kN, tb=522
4.Rh3 Rc1 5.Rh4 Rd1 6.Rh5 Rc1 7.Rg6 Rd1 8.Tg5 Tf8 9.gxf8D
+- (2.15) Profondeur: 12/15 00:00:04 45kN, tb=578
4.Rh3 Rc1 5.Rh4 Rd1 6.Rh5 Rc1 7.Rg6 Rd1 8.Tg5 Tf8 9.gxf8D
+- (2.65) Profondeur: 12/15 00:00:04 49kN, tb=578
4.Rh3 Re1 5.Rh4 Rf1 6.Tg5 Re2 7.Rh5
+- (2.65) Profondeur: 12/16 00:00:04 57kN, tb=643
4.Rh3 Re1 5.Rh4 Rf1 6.Tg5 Re2 7.Rh5 Re3 8.Rg6 Rf2 9.Rh7 Th8+ 10.gxh8D
+- (2.90) Profondeur: 13/17 00:00:04 68kN, tb=682
4.Rh3 Re1 5.Rh4 Rf1 6.Tb2
+- (2.90) Profondeur: 13/17 00:00:05 71kN, tb=688
4.Rh3 Re1 5.Rg3
+- (2.65) Profondeur: 14/24 00:00:05 83kN, tb=749
4.Rh3 Re1 5.Rh4 Rf1 6.Tg5 Re2 7.Rh5 Rd2 8.Tg3 Rd1 9.Rg6 Tf8 10.gxf8D
+- (2.65) Profondeur: 14/24 00:00:05 92kN, tb=761
4.Rh3 Re1 5.Rh4 Rf1 6.Tg5 Re2 7.Rh5 Rd2 8.Tg2+ Rxc3 9.Rg5
+- (2.40) Profondeur: 15/19 00:00:05 108kN, tb=844
4.Rh3 Re1 5.Rh4 Rf1 6.Tg5 Re2 7.Rh5 Rd2 8.Txc5 Rxc3 9.Td5
+- (1.90) Profondeur: 15/21 00:00:06 125kN, tb=968
4.Rh3 Re1 5.Rh4 Rf1 6.Tg3 Re1 7.Rh5 Rd2 8.Rg6 Te8
+- (1.90) Profondeur: 15/24 00:00:07 162kN, tb=1315
4.Rh3 Re1 5.Rh4 Rf1 6.Tg3 Re1 7.Rh5 Rd2 8.Rg6 Te8 9.Rf5 Tg8 10.Re6 Rc2 11.Rf7
Tf8+ 12.gxf8D
+- (2.15) Profondeur: 16/19 00:00:07 188kN, tb=1935
4.Rh3 Re1 5.Rh4 Rf1 6.Tg3 Re1 7.Rh5 Rd2 8.Rg6 Te8 9.Rh7 Rc2
+- (2.65) Profondeur: 16/21 00:00:07 195kN, tb=1943
4.Rh3 Re1 5.Rh4 Rf1 6.Tg3 Re1 7.Rh5 Rd2 8.Rg6 Td8 9.Rh7 Td7 10.Tf3 Rc2 11.Rh8
Td8+ 12.Tf8
+- (3.82) Profondeur: 16/22 00:00:08 250kN, tb=2047
4.Rh3 Re1 5.Rh4 Rf1 6.Tg3 Rf2 7.Rh3
+- (3.57) Profondeur: 17/23 00:00:10 305kN, tb=2634
4.Rh3 Re1 5.Rh4 Rf1 6.Tg3 Rf2 7.Rh3
+- (3.07) Profondeur: 17/23 00:00:10 322kN, tb=2863
4.Rh3 Re1 5.Rh4 Rf1 6.Tg3 Rf2 7.Tg6 Re1 8.Rg5 Rd2 9.Rf6 Rxc3 10.Tg3+ Rc2 11.Tg2+
Rd3 12.Rf7 Txg7+ 13.Txg7 c3
+- (1.49) Profondeur: 17/28 00:00:13 490kN, tb=4631
4.Rg1 Re1
+- (1.50) Profondeur: 17/28 00:00:17 628kN, tb=7492
4.Rg1 Re1 5.Tg3 Re2 6.Tg2+ Rd3 7.Rf2 Rxc3 8.Re2
+- (1.50) Profondeur: 17/28 00:00:17 641kN, tb=7591
4.Rg1 Re1 5.Tg3 Rd2 6.Rf2 Rc2 7.Re2 Rb3 8.Rd2 Td8+ 9.Re3 Td3+ 10.Rf4 Rxc3 11.g8D
Tf3+ 12.Rxf3 Rb2
+- (1.67) Profondeur: 18/31 00:00:20 858kN, tb=10183
4.Rg1 Re1 5.Rh1 Rd1 6.Rh2 Re1 7.Rg1
+- (1.50) Profondeur: 19/29 00:00:23 1039kN, tb=12299
4.Rg1 Re1 5.Rh1 Rf1 6.Rh2 Td8
+- (1.49) Profondeur: 20/26 00:00:31 1287kN, tb=18005
4.Rg1 Re1 5.Rh1 Rd1 6.Rh2 Rc1
+- (1.48) Profondeur: 21/30 00:00:54 1671kN, tb=25571
4.Rg1 Re1 5.Rh1 Rf1 6.Rh2 Re1 7.Rg1
+- (1.48) Profondeur: 22/30 00:01:17 2312kN, tb=41478
4.Rg1 Re1 5.Rh1 Rf1 6.Rh2 Re1 7.Rg1
+- (1.48) Profondeur: 23/25 00:01:30 2647kN, tb=48996
4.Rg1 Re1 5.Rh1 Rf1 6.Rh2 Re1 7.Rg1
+- (1.48) Profondeur: 24/27 00:01:50 2927kN, tb=54630
4.Rg1 Re1 5.Rh1 Rf1 6.Rh2 Re1 7.Rg1 Rd1 8.Rf2 Rc2 9.Tg3 Th8
+- (1.73) Profondeur: 25/28 00:02:56 3406kN, tb=61847
4.Rg1 Re1 5.Rh1 Rf1 6.Rh2 Re1 7.Rg1 Rd1 8.Rf2 Rc2 9.Tg3 Th8
+- (1.73) Profondeur: 25/28 00:03:04 3636kN, tb=63071
Analysis by Hiarcs 9:
...
4.Rh3 Re1 5.Rh4 Rf1 6.Tg4 Re2
+- (1.55) Profondeur: 8/15 00:00:00 9kN, tb=15
4.Rh3 Re1 5.Rh4 Rf1 6.Tg5 Re2 7.Rh3 Rf3
+- (1.50) Profondeur: 8/17 00:00:00 10kN, tb=15
4.Rh3 Re1 5.Rh4 Rf1 6.Tg4 Re2 7.Tg3 Rd2
+- (1.52) Profondeur: 9/17 00:00:01 20kN, tb=36
4.Rh3 Re1 5.Rh4 Rf1 6.Tg4 Re2 7.Tg3 Rd2 8.Rh5 Rc2
+- (1.53) Profondeur: 10/17 00:00:01 31kN, tb=54
4.Rh3 Re1 5.Rh4 Rf1 6.Tg4 Re2 7.Tg3 Rd2 8.Rh5 Rc2
+- (1.78) Profondeur: 11/19 00:00:01 45kN, tb=65
4.Rh3 Re1 5.Rh4 Rd1 6.Rh5
+- (2.59) Profondeur: 11/20 00:00:02 65kN, tb=80
4.Rh3 Re1 5.Rh4 Rd1 6.Rh5
+- (2.32) Profondeur: 12/20 00:00:02 95kN, tb=112
4.Rh3 Re1 5.Rh4 Rf1 6.Tg6 Re2 7.Rh5 Rd2 8.Rh6 Rxc3 9.Rh7 Te8 10.g8D Txg8 11.Rxg8
+- (1.92) Profondeur: 12/22 00:00:03 121kN, tb=144
4.Rh3 Re1 5.Rh4 Rf1 6.Tg6 Re2 7.Rh5 Rd2 8.Rh6 Rxc3 9.Rh7 Te8 10.g8D Txg8 11.Rxg8
+- (2.17) Profondeur: 13/22 00:00:04 166kN, tb=294
4.Rh3 Re1 5.Rh4 Rf1 6.Tg6 Re2 7.Rh5 Rd2 8.Tg3 Txg7 9.Txg7 Rxc3
+- (2.28) Profondeur: 13/24 00:00:05 195kN, tb=345
4.Rh3 Re1 5.Rh4 Rf1 6.Tg6 Re2 7.Rh5 Rd2 8.Tg3 Txg7 9.Txg7 Rxc3
+- (2.03) Profondeur: 14/25 00:00:07 276kN, tb=527
4.Rh3 Re1 5.Rh4 Rf1 6.Tg6 Re2 7.Rg5 Rd2 8.Rf6 Rxc3 9.Tg3+ Rd4 10.Tg4+ Rd5
11.Tg5+ Rd4 12.Rf7 Td8 13.g8D
+- (1.79) Profondeur: 14/25 00:00:08 368kN, tb=567
4.Rh3 Re1 5.Rh4 Rf1 6.Tg6 Re2 7.Rg5 Rd2 8.Rf6 Rxc3 9.Tg3+ Rd4 10.Tg4+ Rd5
11.Tg5+ Rd4 12.Rf7 Td8 13.g8D
+- (1.54) Profondeur: 15/28 00:00:10 628kN, tb=793
4.Rh3 Re1 5.Rh4 Rf1 6.Tg6 Re2 7.Tg3 Rd2 8.Rh3 Rc2 9.Rg2 Rb2 10.Rf1 Rc2 11.Re2
± (1.34) Profondeur: 15/28 00:00:12 857kN, tb=934
4.Rh1 Re1
+- (1.41) Profondeur: 15/28 00:00:12 1041kN, tb=1068
4.Rh1 Re1 5.Rg1 Rd1 6.Rh2 Re1
+- (1.62) Profondeur: 15/28 00:00:12 1064kN, tb=1118
4.Rh1 Re1 5.Rg1 Rd1 6.Rf1 Rc1 7.Re1
+- (1.77) Profondeur: 16/28 00:00:13 1184kN, tb=1276
4.Rh1 Re1 5.Rg1 Rd1 6.Rf1 Rc1 7.Re1
+- (2.02) Profondeur: 17/29 00:00:16 1469kN, tb=1793
4.Rh1 Rc1 5.Rg1 Rb1 6.Rh2 Rc1 7.Rh3
+- (2.15) Profondeur: 17/29 00:00:17 1654kN, tb=2081
4.Rh1 Rc1 5.Rg1 Rb1 6.Rh2 Rc1 7.Rh3
+- (2.43) Profondeur: 18/29 00:00:21 2017kN, tb=2888
4.Rh1 Rc1 5.Rg1 Rd1 6.Rf1 Rc1 7.Re1 Rb1 8.Rd1 Td8+ 9.Re2 Te8+ 10.Rf3
+- (2.64) Profondeur: 18/29 00:00:22 2208kN, tb=3072
4.Rh1 Rc1 5.Rg1 Rd1 6.Rf1 Rc1 7.Re1 Rb1 8.Rd1 Td8+ 9.Re2 Te8+ 10.Rf3
+- (2.89) Profondeur: 19/30 00:00:29 2741kN, tb=4092
4.Rh1 Rc1 5.Rg1 Rd1 6.Rf1 Rc1 7.Re1 Rb1 8.Rd1 Td8+ 9.Re2 Tg8 10.Rf3 Rc1 11.Re4
Rd1 12.Rd5
+- (3.14) Profondeur: 19/30 00:00:31 3032kN, tb=4337
4.Rh1 Rc1 5.Rg1 Rd1 6.Rf1 Rc1 7.Re1 Rb1 8.Rd1 Td8+ 9.Re2 Tg8 10.Rf3 Rc1 11.Re4
Rd1 12.Rd5
+- (3.39) Profondeur: 20/32 00:00:45 4120kN, tb=6232
4.Rh1 Rc1 5.Rg1 Rd1 6.Rf1 Rc1 7.Re1
+- (3.46) Profondeur: 20/33 00:00:48 4853kN, tb=7350
4.Rh1 Rc1 5.Rg1 Rd1 6.Rf1 Rc1 7.Re1
+- (3.63) Profondeur: 21/34 00:01:13 7114kN, tb=10126
4.Rh1 Rc1 5.Rg1 Rd1 6.Rf1 Rc1 7.Re1
+- (3.88) Profondeur: 22/35 00:03:14 10927kN, tb=13415
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