Author: Ron Murawski
Date: 09:46:57 07/19/02
Go up one level in this thread
On July 19, 2002 at 01:54:47, Steffen Jakob wrote: >On July 18, 2002 at 23:52:40, Ron Murawski wrote: > >>On July 18, 2002 at 22:24:13, K. Burcham wrote: >> >>> >>>here GM Timman 2623 FIDE played 14.Nxf6 >>>is there any program that prefers to exchange Knights at f6, instead of the pawn >>>capture at e7? >>> >>>kburcham >>> >>> >>> >>> [D] rnbq1r2/4ppkp/p2p1np1/3N4/1p1N4/4Q2P/PPP2PP1/2KR1B1R w - - 0 1 >> >>On a 1.8GHz AMD, it takes the latest Horizon beta 14.12 seconds to find Nb6. >>Horizon agrees with Chessmaster that this is the best move. >> >>Depth Score Time Nodes pv >> 4 47 44 16293 Nxe7 Re8 Re1 Kh8 >> 4 115 44 16673 Nxf6 exf6 Qe4 Ra7 >> 4 128 49 17552 Nxb4 Kh8 Qh6 Ra7 >> 4 137 49 19005 Bc4 Kh8 Nxe7 Ra7 >> 5 79? 55 30021 Bc4 Bb7 Ne6+ fxe6 Bxa6 >> 5 115 60 35197 Nxb4 Kh8 Qf3 Ra7 Bc4 >> 5 142 60 41915 Nxe7 Bb7 Ndf5+ Kh8 Qh6 d5 >> 6 128 82 103073 Nxe7 Re8 Re1 Kh8 Bc4 Ra7 >> 7 111 143 279955 Nxe7 Re8 Re1 Bb7 f3 Be4 Bd3 Rxe7 fxe4 >> 8 82? 247 652614 Nxe7 Re8 Re1 Qc7 Qf3 Ra7 Kd2 >> 8 82 478 1481058 Nxe7 Kh8 Qf3 d5 Nxc8 Ng8 >> 9 61 604 1889811 Nxe7 Re8 Qf3 Rxe7 Qxa8 Bb7 Qa7 Bxg2 Qxe7 Qxe7 >> Bxg2 >> 9 111! 1412 4493054 Nb6 Qxb6 Nf5+ Bxf5 Qxb6 Bxh3 Rxh3 > ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ >That is a weird PV! > >Greetings, >Steffen. > Yes, it *is* a weird pv. I have noticed weird lines in Horizon's pv from time to time, but they tend to get replaced quickly. Most of the time the first move in the pv is correct, but every once and a while Horizon can lose a game due to this. I suppose it is caused by search instabilities. I've been searching for this bug for a long time. When I again try and find/fix this bug I will attempt to choose a "better" sequence of 64-bit random numbers for my Zobrist hashing. I'm running out of ideas as to the cause of the occasional pv weirdness. Ron >> 9 114 1648 5265170 Nb6 Bb7 Nxa8 Bxa8 Be2 Bxg2 Rhg1 Be4 Qg5 >> 10 89 2422 7893348 Nb6 Bb7 Nxa8 Bxa8 Kb1 e5 Nf3 Bxf3 Qxf3 d5 >> 11 117 5471 17568997 Nb6 Ra7 Nxc8 Rb7 Nxd6 exd6 Bc4 Rc7 Bb3 >> >>Ron
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