Author: Robert Hyatt
Date: 20:24:32 01/27/03
Go up one level in this thread
On January 27, 2003 at 14:39:46, Frank Phillips wrote:
>On January 27, 2003 at 02:16:09, Ricardo Gibert wrote:
>
>>On January 27, 2003 at 00:36:13, Robert Hyatt wrote:
>>
>>>On January 27, 2003 at 00:18:55, Ricardo Gibert wrote:
>>>
>>>>I played a couple of 15 10 standard games against Crafty on ICC from the
>>>>Searcher-Crafty CCT5 rook ending position, which had ended in a draw. The object
>>>>was to see if the ending was really an easy win for Black i.e. if *I* can win
>>>>it, anyone can ;)
>>>>
>>>>I played both 61...b5 and 61...Re8. The first game with 61...b5 got a little
>>>>trickier than expected and the second was very simple, so I guess it could be
>>>>said the position is "marginally easy." For those who are curious, here is the
>>>>PGN for both games:
>>>
>>>The real question is "if you are playing black, with about 8 minutes on
>>>your clock, and the clock ticking, can you find the way to win without making
>>>any errors. As just one error is all it takes, particularly in the b5
>>>line (as opposed to Re8 which looks a bit simpler after studying it).
>>
>>
>>I prepared a little by playing Ruffian. My intention was to prepare by playing
>>about 20 blitz games, but after going 3-0 easily against Ruffian, I got lazy. It
>>was too easy and that was with 2 6 where I finished each game with more time
>>than what I started with. In our games, I had to sit on my hands to keep from
>>playing too quickly. You see, I don't play slow chess anymore and very rarely
>>even play blitz. I'm a bullet addict.
>>
>>However, probably a more relevant question is how Crafty would have done against
>>another engine. I have a feeling the draw against Searcherx may have been due to
>>a poor eval for Rook endings.
>
>
>Not sure it was the rook evaluation. I played too quick games against
>Crafty19.2 and Searcher managed to win, without the Re8 method. (Before CCT5 I
>was trying to discourage this approach.). Interestingly since CCT5 I have
>changed extensions and pawn evaluation but not rook evaluation.
>
>I am mildly amused that Bob is taking flak for my computer being too stupid to
>win.
>
>Frank
I don't think I have "taken any flak" about this. We were discussing the
idea of whether this is an "easy to win" position or not. I initially didn't
think so, and still don't think it is "trivial" although it is pretty
straight-forward... But I hadn't looked at it carefully and so my opinion
was not based on any careful study at all, just a "feeling" that there were
issues that might be hard to solve OTB...
>
>
>[Event "Computer chess game"]
>[Site "asus.home.com"]
>[Date "2003.01.27"]
>[Round "-"]
>[White "Crafty-19.2"]
>[Black "Searcher"]
>[Result "0-1"]
>[TimeControl "300+3"]
>[FEN "8/1p1R2pk/5p2/7P/7P/5Kn1/4r3/8 b - - 0 1"]
>[SetUp "1"]
>
>{--------------
>. . . . . . . .
>. p . R . . p k
>. . . . . p . .
>. . . . . . . P
>. . . . . . . P
>. . . . . K n .
>. . . . r . . .
>. . . . . . . .
>black to play
>--------------}
>1... b5 2. Kxg3 Re5 3. Kg4 Re4+ 4. Kg3 Kh6 5. Rb7 Re5 6. Kg4 Rxh5 7. Rb8
>Rc5 8. Rh8+ Kg6 9. h5+ Kf7 10. Rb8 Rg5+ 11. Kh4 Ke6 12. Rb6+ Kd7 13. h6
>gxh6 14. Rxf6 Kc7 15. Rf1 b4 16. Rb1 Rb5 17. Rb3 Kd6 18. Kg3 Kc5 19. Kf4
>Kc4 20. Rb2 b3 21. Kg4 Kc3 22. Rb1 b2 23. Kg3 Kc2 24. Rf1 b1=Q 25. Rf2+ Kc3
>26. Rf3+ Kd4 27. Rf4+ Ke3 28. Rf3+ Kd2 29. Rf2+ Ke1 30. Rg2 Rg5+ 31. Kf4
>Qb4+ 32. Kf3 Rxg2 33. Kxg2 Qg4+ 34. Kh2
>{White resigns} 0-1
>
>[Event "Computer chess game"]
>[Site "asus.home.com"]
>[Date "2003.01.27"]
>[Round "-"]
>[White "Crafty-19.2"]
>[Black "Searcher"]
>[Result "0-1"]
>[TimeControl "900+3"]
>[FEN "8/1p1R2pk/5p2/7P/7P/5Kn1/4r3/8 b - - 0 1"]
>[SetUp "1"]
>
>{--------------
>. . . . . . . .
>. p . R . . p k
>. . . . . p . .
>. . . . . . . P
>. . . . . . . P
>. . . . . K n .
>. . . . r . . .
>. . . . . . . .
>black to play
>--------------}
>1... b5 2. Kxg3 Re5 3. Kg4 Re4+ 4. Kg3 Kh6 5. Rb7 Rb4 6. Rd7 Rb1 7. Kg4
>Rg1+ 8. Kh3 Rh1+ 9. Kg4 Rg1+ 10. Kh3 Rb1 11. Kg4 b4 12. Rd8 Kh7 13. Rb8 b3
>14. Kf3 b2 15. Kg2 f5 16. Rb6 f4 17. Rb7 f3+ 18. Kg3 Rg1+ 19. Kf2 b1=Q 20.
>Rxb1 Rxb1 21. Kxf3 Re1 22. h6 Kxh6 23. Kf2 Re5 24. Kg3 Kh5 25. Kf4 Re7 26.
>Kg3 Rf7 27. Kh3 Rf3+ 28. Kh2 Kxh4 29. Kg2 Rf4 30. Kh2 Rf2+ 31. Kh1 Kg4 32.
>Kg1
>{White resigns} 0-1
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