Author: pete
Date: 23:28:16 05/20/99
Go up one level in this thread
On May 20, 1999 at 11:47:11, Francis Monkman wrote:
>
>On May 20, 1999 at 02:47:52, pete wrote:
>
>
>>For example Hiarcs will play nxf6 in no time too and the line up to rd8 is shown
>>, but the whole variation has a problem ; nc7 is a serious blunder ; black can
>>play a6 instead which makes it possible to defend the bishop on c8 with na7. I
>>am quite sure white will win this position eventually but it is very difficult
>>to judge for a chess prog as the material seems to favour black a little. So the
>>programs see the combination leading to a little ( in their opinion) advantage
>>which can be gained by other first moves too. So if you say lgg finds this in
>>less than 5 minutes please give the evaluation and the main line.
>>
>>Pete
>
>Sorry to have to tell you, Pete, but this is horrible!
>
>At least the idea of knight protecting rook (so bishop can move) is sound,
>even if it doesn't work! And of course, Smyslov has no doubt seen all
>eventualities. After ...a6 and ...Na7, knight, bishop and rook are locked
>in an 'unholy trinity' of mutual protection (and immobility). Eg:
>
>...a6 Re1 and if immediate ...Na7 then Re7+ Kh6 (...Kf6 Rxh7+-) Rh8
>Kg5 Rexh7+-
>
>If Black wants to be coy he can play ...a6 Re1 [and eg.] ...h5 c4 Na7
>and then White plays Ree8 -- I'll leave the rest to you. In human terms,
>Black was obviously right to resign on move 24, whatever his move 23.
>
>Francis
I was trying to explain how I think a chessprog will judge the position and was
surprised you didn't put any analysis by lgg so I downloaded it.
I get on PII 300 128 MB in 5 minutes:
depth=12 +0.72 d5f6 e7f6 d1d8 f8g7 e5f6 g7f6 d8h8 f6g7 h8e8 a8b8 h1d1 g7f7 d1e1
Nodes: 91938814 NPS: 32146438
As expected the program sees some advantage but no clear decision; look at the
rebel analysis, looks very similar to me. I think some of the lines you give
above are not that convincing but I didn't want to prove the position is ok for
black anyway.
So I put the following test to reassure:
[Event "Computer chess game"]
[Site "Testmatch"]
[Date "1999.05.20"]
[Round "-"]
[White "LGGold/PII300"]
[Black "Hiarcs 7.01 / P233MMX"]
[Result "*"]
[TimeControl "60/3600"]
[FEN "r1b2k1r/pp2p2p/5pp1/1n1NB3/8/1P4P1/P1P4P/2KR3R w - - 0 1"]
[SetUp "1"]
{--------------
r . b . . k . r
p p . . p . . p
. . . . . p p .
. n . N B . . .
. . . . . . . .
. P . . . . P .
P . P . . . . P
. . K R . . . R
white to play
--------------}
1. Nxf6 exf6 2. Rd8+ Kf7 3. Rxh8 fxe5 4. Rf1+ Ke6 5. Re8+ Kd6 6. Rf6+ Kd7
7. Rxe5 Nc3 8. a4 Na2+ 9. Kd2 Nb4 10. Rf7+ Kd6 11. Re8 Be6 12. Rxa8 Bxf7
13. Rxa7 Bd5 14. c3 Na6 15. b4 Kc7 16. Ra8 Nb8 17. a5 Kc8 18. b5 Bc4 19. b6
Bb5 20. Ke3 h6 21. Kd4 Bc6 22. Ke5 Bb5 23. Ke6 Bd3 24. Kf6 Bc2 25. g4 h5
26. gxh5 gxh5 27. Ke6 Bd3 28. Kd5 Be2 29. h4 Bf1 30. Ke6 Bd3 31. Kd6 Be4
32. Ke5 Bd3 33. Kf6 Be4 34. Kg5 Bf3 35. Kf5 Bg4+ 36. Kg6 Be2 37. c4 Bf3 38.
c5 Be2 39. Kg5 Bf3
*
Here the winboard engine crashed but it was clear from the previous move lgg
intended c4 which is a clear win. But if you check the lines with lgg you will
see : from move 3 to 6 for example lgg judges the position as completely even;
then it buries its rook on a8 and for many moves has no idea to form a winning
plan; in fact it was a much closer match than I expected :)
Pete
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