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Subject: Re: Interesting endgame position (Crafty 19.8 SE WB)

Author: Kurt Utzinger

Date: 16:01:08 01/03/04

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On January 03, 2004 at 16:44:39, F. Jermann wrote:

>The following position occured in a game played yesterday by me against an ELO
>2300 player. After almost 5 hours of fight, the move Kb6 was the last bad
>move...
>
>Interestingly many engines have 'problems' to see the winning move g4! whereas
>others find it almost immediately. Maybe a good test for 'pushed pawn' code?!
>
>[d] 8/PR3p2/1K2pk2/6p1/8/1B2n3/8/r7 b - - 2 53 bm g4;black wins!
>
>Best,
>Frank

Crafty 19.8 SE  WB2: (P4 1.8/64 MB hash under Arena 1.02)

 7   00:00 -0.31   1. ... Nf5 2. Rb8 Nd4 3. Bc4 Rxa7 4. Rd8 Re7 5. Rxd4
 8   00:00 -0.17   1. ... Nf5 2. Rd7 Ra3 3. Bc2 Ne3 4. Be4 Nc4+ 5. Kc5 Ne5
 8   00:00 -0.71   1. ... Ra3!!
 8   00:00 -1.10   1. ... Ra3 2. Kc5 g4 3. Kb4 Ra6 4. Kb5 Ra3 5. Kc6
 9   00:01 -1.09   1. ... Ra3 2. Kc5 g4 3. Kb4 Ra6 4. Kb5 Ra1 5. Ba4 Rb1+ 6. Kc6
10   00:02 -0.63   1. ... Ra3 2. Kc5 Nf5 3. Kb4 Ra6 4. Rd7 Ne3 5. Kb5 Ra3 6. Kc6
11   00:04 -0.51   1. ... Ra3 2. Kc5 Nf5 3. Bd1 Ne7 4. Kb5 Nd5 5. Bh5 Ke5 6.
Bxf7 g4
12   00:08 -0.24   1. ... Ra3 2. Kc5 Nf5 3. Kb4 Ra6 4. Rd7 Nd6 5. Rxd6 Rxa7 6.
Kc5 Rc7+ 7. Kd4 g4
13   00:15 -0.25   1. ... Ra3 2. Kc5 Nf5 3. Kb4 Ra6 4. Kb5 Ra1 5. Rd7 Nd4+ 6.
Rxd4 Rxa7 7. Kc5 e5 8. Rd8
14   00:28  0.23   1. ... Ra3 2. Kc5 Nf5 3. Kb4 Ra6 4. Kb5 Ra1 5. Ba4 Nd6+ 6.
Kb4 Rb1+ 7. Kc3 Rxb7 8. a8=Q Rc7+ 9. Kd3 g4
14   00:55 -0.65   1. ... g4!!
14   01:22 -1.09   1. ... g4 2. Rb8 g3 3. a8=Q Rxa8 4. Rxa8 g2 5. Rg8 Kf5 6.
Bc2+ Nxc2 7. Rxg2 Ne3 8. Rg7 Nd5+ 9. Kc6 f6
15   01:56 -1.17   1. ... g4 2. Rb8 g3 3. a8=Q Rxa8 4. Rxa8 g2 5. Rg8 Kf5 6. Bd1
Nxd1 7. Rxg2 Ne3 8. Rg7 f6 <HT>
16   04:19 -1.01   1. ... g4 2. Rc7 g3 3. Rc1 Ra3 4. Bc4 g2 5. Bb5 e5 6. Kb7 Nf1
7. Rxf1+ gxf1=Q 8. Bxf1 Rxa7+ 9. Kxa7 e4 10. Kb7 e3 11. Be2






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