Author: John Merlino
Date: 13:08:23 12/30/02
Go up one level in this thread
On December 30, 2002 at 14:39:30, bobby palacios wrote: >On December 30, 2002 at 14:08:03, John Merlino wrote: > >>On December 29, 2002 at 21:06:36, bobby palacios wrote: >> >>>[D] 6k1/5pp1/4r2p/P2p2b1/1N4n1/B2RP1P1/2R2PKP/4qB2 b - - 0 34 >>> >>> >>> >>> >>>This position arose from TheKing 3.23 - Junior 7 blitz game on my p4 2.4ghz. I >>>dont know if TheKing 3.23 played the best defensive moves, but it was still a >>>pretty good move that most engines couldnt find (only evaluating it as a draw). >>>It definitely turned the tide of battle. Junior 7 found it in less than 5 >>>seconds with an eval of -0.36 in its favour. >>> >>>The game continued: >>> >>>34...Nxe3 35. fxe3 Rf6 36. Rc1 Qf2+ 37. Kh1 Bxe3 38. Rxe3 Qxe3 39. Rc8+ Kh7 >>> 40. Bd3+ g6 41. Rc2 Rf2 42. Rxf2 Qxf2 43. a6 f5 44. h4 h5 45. Bc1 Qe1+ >>>46. Kh2 Qxc1 0-1 >>> >>>And the Queen continued to mop up the remaining pieces. >> >>Chessmaster 9000, on a P3-733, finds Nxe3 in three seconds, and gives it a draw >>score after 15 seconds. Also note that the PV for the draw scores are identical >>to the moves played in the game all the way up to and including 41.Rc2, which is >>14 ply away. So, whatever happened in the game was beyond that search horizon, >>particularly since you said this was a blitz game. >> >>After some fiddling around, it appears that The King needs to get to depth 19 >>from the initial position to find the winning move 41...Rf2 instead of >>41...Qf3+. >> >>So, this might be a case of the best move happens to lead to forced moves which >>happens to lead to a win later on, and not even Junior saw the win until several >>moves after 34...Nxe3. I wonder how Junior evaluates the initial position.... >> > >I let Junior 7 search for 5 minutes (p4 2.4ghz) and it came up with: > >Depth 17 >34...Nxe3+ 35.fxe3 Rf6 36. Rc1 Qf2+ 37.Kh1 Bxe3 38.Rxe3 Qxe3 39.Bd3 g6 40.Rc8+ >Kh7 41.Rc2 > >with an advantage for black of -0.81 > >And after 10 minutes: > >Depth 18 >34...Nxe3+ 35.Rxe3(a better move than fxe3) Bxe3 36.Bd3 Bd4 37.Nc6 Rxc6 38.Re2 >Qxf2+ 39.Rxf2 Bxf2 40.Kxf2 Rc3 41.Bb4 Rb3 42.Ke3 Rxb4 43.a6 Ra4 > >with an advantage for black of -1.10 I guess this is no surprise, given that you have a box over 3 times faster than mine, and you let Junior think longer. Still, it does show that Junior might know how to evaluate the position after 41.Rc2 better, assuming of course that that is where the PV at depth 17 ended. jm
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