Author: Bernd Nürnberger
Date: 07:06:10 04/02/04
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On April 02, 2004 at 09:10:06, Heiner Marxen wrote: >On April 01, 2004 at 07:57:27, Bernd Nürnberger wrote: > >>On March 31, 2004 at 12:35:21, Renze Steenhuisen wrote: >> >>>>(1) >>>>I recognized that a different move ordering delivers very alternating >>>>results in my alpha beta search. (I implemented null move, pv search, >>>>mvv/lva, some history moves, transposition table, quiescence search ...) >>>>Is this a bug or is this a normal behaviour? >>>>For example, with 3 history moves (on initial position) i get: >>>>[...] >>>> 8. 0:01.12 993512 0.00 Nc3 Nf6 d4 d5 Nf3 Bf5 Ne5 Ne4 >-------------------------------^^^^ >>>>... and with just one more history move (4): >>>>[...] >>>> 8. 0:01.28 1088694 0.00 e4 Nc6 Nf3 e5 d4 Nxd4 Nxd4 h6 >-------------------------------^^^^ >>> >>>Seems reasonable. >> >>Mmmh, that still is not very reasonably to me to get much different results >>for different move orderings. >>The score of the moves itself should not be affected ?! >>Do you have an explanation? > >But the score _is_not_ changed... see above. > >Cheers, >Heiner That's just a coincidence, another example from another position: 10. 0:00.57 459625 0.22 Rxf4 Kg3 Rf7 Kxg2 Kb4 c5 Kb3 c4 ... and with a slightly different move ordering: 10. 0:01.78 1694656 0.01 e3 Kg3 exf4 Rf5 Rb2 Kxf4 Ka4 Rg5 That still seems somewhat strange to me ?! These are not made up strange examples. A different move ordering changes everything very much in my engine and I am not glad about this fact, whether it's natural or not, because I still cannot understand it .. Greetings, Bernd
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