Author: Vincent Diepeveen
Date: 07:15:33 09/16/00
Hello,
During the WMCC after round #1 i was very sick DIEP allowed shredder
to exchange to a rook ending which appeared to be an easy win for
shredder, instead to an opposite bishops rook endgame.
So i directly putted the penalty for opposite bishops higher!
Now i analyzed just for fun the position where deep blue played 37.Be4?
against Deep Blue.
[Event "ICC u 120 0 05/04/97"]
[Site "Internet Chess Club"]
[Date "1997.05.04"]
[Round "-"]
[White "Deep-Blue"]
[Black "Kasparov"]
[Result "1-0"]
[WhiteElo "0"]
[BlackElo "2795"]
[GameID "862766392"]
[ECO "C93"]
[NIC "RL.22"]
[LongECO "Ruy Lopez: closed, Smyslov defense"]
1. e4 e5 2. Nf3 Nc6 3. Bb5 a6 4. Ba4 Nf6 5. O-O Be7
6. Re1 b5 7. Bb3 d6 8. c3 O-O 9. h3 h6 10. d4 Re8
11. Nbd2 Bf8 12. Nf1 Bd7 13. Ng3 Na5 14. Bc2 c5 15. b3 Nc6
16. d5 Ne7 17. Be3 Ng6 18. Qd2 Nh7 19. a4 Nh4 20. Nxh4 Qxh4
21. Qe2 Qd8 22. b4 Qc7 23. Rec1 c4 24. Ra3 Rec8 25. Rca1 Qd8
26. f4 Nf6 27. fxe5 dxe5 28. Qf1 Ne8 29. Qf2 Nd6 30. Bb6 Qe8
31. R3a2 Be7 32. Bc5 Bf8 33. Nf5 Bxf5 34. exf5 f6 35. Bxd6 Bxd6
36. axb5 axb5 37. Be4 Rxa2 38. Qxa2 Qd7 39. Qa7 Rc7 40. Qb6 Rb7
41. Ra8+ Kf7 42. Qa6 Qc7 43. Qc6 Qb6+ 44. Kf1 Rb8 45. Ra6
{Black resigns} 1-0
Now after move 37.Qb6 white is won. However to my big surprise DIEP's
score drops and drops when searching here. It drops to about 0.10 !!!!!!
Really incredible. the reason appears to be very simple. After
37.Qb6 Rxa2 28.Rxa2,Ra8 29.Ra5,Rxa5 30.bxa5,Qb8 then black forces to
an opposite bishop ending! 31.Qxb8,Bxb8
However, the bishop ending is lost for black. And exactly that's what DIEP
is misevaluating now. Only after i start making moves and move with the king
from g1 to g4 then it starts getting fail lows. Obviously white has
2 passed pawns which keep both the black king AND bishop busy, where blacks
2 potential passed pawns cannot form a real threat.
32. Kf2,.. 33.Kf3 etcetera.
However one can do all kind of weird moves with black before the
evaluator will see the problem!
So where it's obvious that white has a real cool try to win this endgame,
and where black must do real effort to prevent losing it, there the long
time till white can force into a position which is evident for
the programs to win, it's logical that if you use real high scores for things
like opposite bishops, that Be4 gets played. the fact that Deep Blue gets
this fail high so low so soon (though score is much higher as the 0.10
from diep at 21 ply for Qb6) this explains easily that deep blue is based
upon real high scores.
All the e4 lines are completely nonsense. No chance of getting those lines.
It's the opposite bishop score that is getting the axb5 and Be4 moves for it!
Diep nowadays is also completely missing that after the above line
white has a won opposite bishop endgame, and it's hard to blame it for that!
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Last modified: Thu, 15 Apr 21 08:11:13 -0700
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