Author: Marc van hal
Date: 15:20:43 09/26/98
Go up one level in this thread
On September 26, 1998 at 10:18:16, Robert Hyatt wrote: >On September 25, 1998 at 18:04:35, Danniel Corbit wrote: > >>Here is a position from the kurrent kkup2 kontest from >>http://www.gambitsoft.com/kup/chess1/index1.html [which I have carped about >>before]: >>[Event "Komputer Kup 2"] >>[Site "?"] >>[Date "1998.2.9"] >>[Round "?"] >>[White "Crafty (C)"] >>[Black "Rebel 9 (C)"] >>[Result "*"] >> >>1. e4 e6 2. d4 d5 3. Nc3 Nf6 4. Bg5 Be7 5. e5 Nfd7 6. Bxe7 Qxe7 7. f4 O-O 8. >>Nf3 c5 9. Qd2 Nc6 10. dxc5 Qxc5 11. O-O-O Nb6 12. Bd3 f6 13. exf6 Rxf6 14. g3 >>Bd7 15. Rhe1 Nc4 16. Bxc4 Qxc4 17. Qe2 b5 18. Qxc4 bxc4 19. Ne5 Nxe5 20. Rxe5 >>Raf8 21. Ne4 Rh6 22. Nc5 Bc8 23. Rd2 Kf7 24. h4 Re8 25. b3 cxb3 26. axb3 Re7 >>27. Re3 Rc7 28. Nd3 Rf6 29. Ne5+ Ke7 30. Rde2 Kd6 31. Re1 Ba6 32. Kd2 Bb5 33. >>Ra1 d4 34. Ree1 Rf5 35. Kc1 Rc3 36. Rxa7 Rxg3 37. Nf7+ Kd5 38. Ng5 h6 39. Nxe6 >>Re3 40. Nc7+ Ke4 41. Rg1 Rf3 42. Rxg7 R3xf4 43. Ra5 Bf1 44. Re7+ Kf3 45. Rxf5 >>Rxf5 46. Ne6 Ke4 47. Ng7+ Re5 48. Rxe5+ Kxe5 49. Kd2 Bb5 50. Nh5 Be8 51. Ng3 >>Bd7 52. Ne2 Ke4 53. Nc1 Be8 54. Nd3 Bb5 55. Nb2 Kd5 * >> >>I like: >>56. c4+ >> >>Crafty played: >>56. Kc1 >> >>Now, the reason I like this move over the one Crafty chose is many-fold. As >>far as material, it is a near tie, as I would rather have the bishop than >>the knight at this stage, but technically Crafty is a pawn up. I believe >>that the black pawn on d4 is much more valuable than white pawn on d2, >>because of two reasons. First, it is far advanced towards the enemy's first >>rank. This will cause white to have to tie up material to prevent queening. >>Second, the black king and bishop are nearby for protection of the pawn, and >>can make things difficult. In short, the pawn on d4 will be a constant >>worry until it is eliminated. By playing c4+, the *only* sensible choice is >>an e.p. capture, which trades pawns, but [in my -not so expert- view] a >>great pawn for black is eliminated in return for a ho-humm pawn for white. >> >>I think most would agree that the pawns are *not* of the same value. Is >>there any program that takes this into account? Or is my analysis all >>washed up? >> >>I realize that in this case, it is a tempest in a teapot, since the game is >>probably a draw anyway. But in other situations not so. Opinions? > > >This is a difficult question to answer. The short answer is that yes, >pawn values are very dynamic, at least in crafty. How far they have >advanced, whether they can be defended by pawns (are they isolated or >artificially isolated because they have advanced too far to be defended >by pawns) are they passed, passed and protected, if weak, are they on >open files, can they be used as a "lever" or are they blocked from >doing so... > >EvaluatePawns() is a large piece of code... and it is probably easier >to read the comments to at least see what Crafty does... Nimzo98 does and even gives a higher valeu for conected passed pawns 2 conected pawns have a higher valeu as a rook
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