Author: José de Jesús García Ruvalcaba
Date: 13:59:06 07/28/99
Go up one level in this thread
On July 28, 1999 at 15:05:03, Dann Corbit wrote:
>On July 28, 1999 at 14:39:26, José de Jesús García Ruvalcaba wrote:
>
>> The following rook endgame
>>8/k6p/3R4/8/Pp6/1P1p2P1/2r2P1P/6K1 b - - 0 36
>>should be an easy win for white; but some engines (like phalanx, for example)
>>manage to lose it (at blitz)!
>> Is this a difficult position to play for computers?
>Your question is a bit hard to answer. You list the position for black, but say
>that white has a hard time with it. What exactly is the position that gives the
>computer trouble? What was the computer generated move? What is the correct
>move?
>
>From the stated position, crafty would move Rc3 with a score of about -2 pawns.
The position comes from a real game, and it is black to move. I think black is
lost, in fact black resigned a few moves later.
This is not a test position in the usual way, there is no "best move" or "avoid
move". This position is to play on until the game is decided.
I played black with this position against phalanx, and won. Then I played black
and also won. I am not sure which are the critical positions, as analysis from
other engines are not very useful. Maybe this position is difficult for Phalanx
and not for computers in general. Here you have the scores:
[Event "Computer chess game"]
[Site "escamol"]
[Date "1999.07.28"]
[Round "-"]
[White "phalanx"]
[Black "jose"]
[Result "0-1"]
[TimeControl "40/300"]
[FEN "8/k6p/3R4/8/Pp6/1P1p2P1/2r2P1P/6K1 b - - 0 1"]
[SetUp "1"]
{--------------
. . . . . . . .
k . . . . . . p
. . . R . . . .
. . . . . . . .
P p . . . . . .
. P . p . . P .
. . r . . P . P
. . . . . . K .
black to play
--------------}
1... Rc3 2. Kg2 Rxb3 3. Rh6 Rc3 4. Rxh7+ Ka6 5. Re7 b3 6. Re1 b2 7. Rb1 d2
8. f4 Rc1 9. Rxb2 d1=Q 10. Kh3 Rc8 11. Rf2 Qd5 12. f5 Qe4 13. Rf4 Qe2 14.
f6 Rh8+ 15. Rh4 Rxh4+ 16. Kxh4 Qxh2+ 17. Kg4 Qf2 18. Kg5 Qxg3+ 19. Kf5 Qb3
20. Kg6 Qe6 21. Kg7 Qg4+ 22. Kf8 Qc8+ 23. Kg7 Qc3 24. Kf7 Ka5 25. Kg7 Kxa4
26. Kf7 Kb5 27. Kg6 Qg3+ 28. Kh7 Qf4 29. Kg7 Qg5+ 30. Kf7 Kc6 31. Ke6 Qg6
32. Ke7 Qe4+ 33. Kf7 Kd7 34. Kg7 Qe5 35. Kg8 Qxf6 36. Kh7 Qg5 37. Kh8 Ke7
38. Kh7 Kf6 39. Kh8 Qg7#
{Black mates} 0-1
[Event "Computer chess game"]
[Site "escamol"]
[Date "1999.07.28"]
[Round "-"]
[White "jose"]
[Black "phalanx"]
[Result "1-0"]
[TimeControl "40/300"]
[FEN "8/k6p/3R4/8/Pp6/1P1p2P1/2r2P1P/6K1 b - - 0 1"]
[SetUp "1"]
{--------------
. . . . . . . .
k . . . . . . p
. . . R . . . .
. . . . . . . .
P p . . . . . .
. P . p . . P .
. . r . . P . P
. . . . . . K .
black to play
--------------}
1... Rc3 2. Kf1 Rxb3 3. Ke1 Ra3 4. Kd2 Rxa4 5. Kxd3 Ra2 6. Rh6 Rxf2 7. Kc4
Rf7 8. Kxb4 Rg7 9. Kc5 Kb7 10. Kd5 Kc7 11. Ke5 Kd7 12. Kf6 Re7 13. g4 Kd6
14. g5 Rd7 15. h4 Kd5 16. h5 Ke4 17. g6 hxg6 18. hxg6 Rd6+ 19. Kg7 Kf4 20.
Kh7 Kg5 21. Rh1 Rd7+ 22. g7 Kf4 23. Kh8 Rd8+ 24. g8=Q Rxg8+ 25. Kxg8 Ke3
26. Kf7 Kd3 27. Ke6 Kd4 28. Rh4+ Ke3 29. Kf5 Kd3 30. Ke5 Ke3 31. Rh3+ Ke2
32. Kf4 Kd2 33. Ke4 Kc2 34. Kd4 Kd2 35. Rh2+ Ke1 36. Ke3 Kd1 37. Rg2 Kc1
38. Kd3 Kb1 39. Kc3 Ka1 40. Kb3 Kb1 41. Rg1#
{White mates} 1-0
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