Author: bobby palacios
Date: 11:39:30 12/30/02
Go up one level in this thread
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.... > >Time Depth Score Positions Moves >0:00 1/3 2.75 5016 34...Nxh2 35.Rc1 Nf3 36.Rxe1 Nxe1+ > 37.Kh3 Nxd3 38.Bxd3 >0:00 1/3 0.20 6088 34...Rf6 35.f4 Nxe3+ 36.Rxe3 Qxe3 > 37.fxg5 >0:00 1/4 0.38 11223 34...Rf6 35.f4 Nxe3+ 36.Rxe3 Qxe3 > 37.Rc8+ Kh7 38.Bd3+ g6 39.fxg5 hxg5 >0:00 1/5 0.70 43246 34...Rf6 35.f4 Nxe3+ 36.Rxe3 Qxe3 > 37.Bd3 g6 38.fxg5 >0:01 1/6 0.48 80334 34...Rf6 35.f4 Nxe3+ 36.Rxe3 Qxe3 > 37.Bd3 g6 38.fxg5 Qf3+ 39.Kg1 hxg5 >0:02 1/7 0.81 155348 34...Rf6 35.f4 Nxe3+ 36.Rxe3 Qxe3 > 37.Bd3 g6 38.Bc1 Qe1 39.fxg5 >0:03 1/7 0.49 222034 34...Nxe3+ 35.Rxe3 Bxe3 36.Rc8+ > Kh7 37.Bd3+ g6 38.fxe3 Rxe3 39.Bc1 > Rxd3 40.Nxd3 Qxa5 >0:05 1/8 0.44 434450 34...Nxe3+ 35.Rxe3 Bxe3 36.Rc8+ > Kh7 37.Bd3+ g6 38.fxe3 Rxe3 39.Kh3 > Rxd3 40.Nxd3 Qxa5 >0:15 1/9 0.00 1251756 34...Nxe3+ 35.fxe3 Rf6 36.Rc1 Qf2+ > 37.Kh1 Bxe3 38.Rxe3 Qxe3 39.Rc8+ > Kh7 40.Bd3+ g6 41.Rc2 Qf3+ 42.Kg1 > Qd1+ 43.Kg2 Qf3+ 44.Kh3 Qh5+ 45.Kg2 > Qf3+ >0:25 2/10 0.00 2203649 34...Nxe3+ 35.fxe3 Rf6 36.Rc1 Qf2+ > 37.Kh1 Bxe3 38.Rxe3 Qxe3 39.Rc8+ > Kh7 40.Bd3+ g6 41.Rc2 Qf3+ 42.Kg1 > Qd1+ 43.Kg2 Qf3+ 44.Kh3 Qh5+ 45.Kg2 > Qf3+ >1:18 3/11 0.00 7335333 34...Nxe3+ 35.fxe3 Rf6 36.Rc1 Qf2+ > 37.Kh1 Bxe3 38.Rxe3 Qxe3 39.Rc8+ > Kh7 40.Bd3+ g6 41.Rc2 Qf3+ 42.Kg1 > Qd1+ 43.Kg2 Qf3+ 44.Kh3 Qh5+ 45.Kg2 > Qf3+ >3:48 4/12 0.00 21966467 34...Nxe3+ 35.fxe3 Rf6 36.Rc1 Qf2+ > 37.Kh1 Bxe3 38.Rxe3 Qxe3 39.Rc8+ > Kh7 40.Bd3+ g6 41.Rc2 Qf3+ 42.Kg1 > Qd1+ 43.Kg2 Qf3+ 44.Kg1 > >jm 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
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