Author: Robert Hyatt
Date: 10:26:38 02/28/01
Go up one level in this thread
On February 28, 2001 at 10:56:42, Miguel A. Ballicora wrote: >On February 28, 2001 at 10:16:39, Robert Hyatt wrote: > >>On February 28, 2001 at 04:10:58, Frank Phillips wrote: >> >>>Below is one of several of games I lost to Comet (utuerke on chess.net) in >>>impressive style. My program played into the following position, assessing it >>>as positive for white, only to lose very quickly after Qa6. Qb7 might have held >>>on longer. I would be interested in other programs static evaluation for the >>>given position. To my untutored eye, the material balance does not look bad for >>>white. >>> >>>[D]4r1k1/Q2b1p1p/1n4p1/3P4/3bq3/6B1/PP3PPP/R4RK1 w - - >>> >>> >>>[Event " "] >>>[Site "localhost"] >>>[Date "2001.02.27"] >>>[Round " "] >>>[White "Searcher"] >>>[Black "utuerke"] >>>[Result "0-1"] >>>[WhiteElo "0"] >>>[BlackElo "0"] >>>[TimeControl "300+3"] >>> >>>1. e4 c5 2. Nf3 Nc6 3. c3 Nf6 4. e5 Nd5 5. d4 cxd4 6. cxd4 d6 7. Bc4 Nb6 8. >>>Bb5 dxe5 9. Bxc6+ bxc6 10. Nxe5 g6 11. Nc3 Qd6 12. O-O Bg7 13. Bf4 Nd5 14. >>>Bg3 O-O 15. Qa4 Nb6 16. Nxc6 Qf6 17. Qb5 Bd7 18. d5 Rfe8 19. Qc5 Rac8 20. >>>Ne4 Qf5 21. Nxe7+ Rxe7 22. Qxe7 Re8 23. Qa3 Qxe4 24. Qxa7 Bd4 25. Qa6 Qxd5 >>>26. Rfd1 Nc4 27. Rac1 Bc6 28. Qxc6 Qxc6 29. b3 Qe4 30. bxc4 Bb2 31. Rb1 Ba3 >>>32. c5 Bxc5 33. h3 Ba3 34. Rb5 Qe2 35. Rbd5 Qxa2 36. R1d2 Re1+ 37. Kh2 Qa1 >>>38. Bf4 Be7 39. Kg3 h5 40. Kf3 Qa4 41. Be3 Qc6 42. Rd4 Bg5 43. Kg3 Bxe3 44. >>>fxe3 Rxe3+ 45. Kf2 Re6 46. Rd1 Qc2+ 47. Kg3 Re2 48. Rd8+ Kg7 49. Rg1 Qc7+ >>>50. Kf3 Qe5 51. Rd3 h4 52. Re3 Qxe3+ 53. Kg4 Qg3# >>>0-1 >> >> >>A static eval here (crafty) is very close to zero. A very short search says >>-1.5 (good for black). > >Interesting position to see examine eval. >My humble program, Gaviota thinks it is +1 for white, after an 8 ply search >thinks that chances are leveled (-0.01) > >Ply: 8 >Qa7-b7 Bd7-b5 Rf1-d1 Bb5-a4 b2-b3 Ba4-d7 a2-a3 Re8-a8 >Score: -0.01 (-2) Evals: 1582874 Time: 25.0s nps: 100451 Q/all: 0.19 > nodes cutoffs missed tree_exp >path 2038792 492570 80436 1.16 >quies 468973 258500 23412 1.09 >all 2507765 751070 103848 1.14 >hashtable= attempts: 2038830 hits: 8.2% perfect: 4.3% >Accum. TOTAL--> Time: 41.04s Nodes: 4100890 nps: 99927 > >Time for total analysis: 41.04 > >Regards, >Miguel One thing crafty doesn't like is to play a piece down for pawns, or two pieces down for a rook/pawn, etc. That is why it thinks this is pretty equal even though one side has a material advantage. Of course, tactically, the extra piece becomes even more important when the search can see how effective it actually is...
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