Author: martin fierz
Date: 06:16:12 12/01/00
i was wondering about some evaluations which fritz 5.00 gives me for the following position: [D]1k1r3r/p1p1n3/1pq1p2p/P3Ppp1/2QP4/8/2P1NPPP/RR4K1 w - - 0 0 the black king is under attack, but fritz gives about +1.5 on depth 11 for qxc6 (to be fair, this is only the second-best move according to fritz). after you play out the moves qxc6 nxc6 the evaluation drops immediately to 0, which is obviously a better evaluation for the position after the queen exchange. is this an example for preprocessing in action - bad black king AND queens on the board? and if yes: which programs do NOT make this type of mistake? has anybody who has a program which does a lot of preprocessing ever tested his preprocessing version against a version which does no preprocessing? to me this example with the queen exchange and an evaluation which jumps by 1.5 looks very suspicious, but of course the program gets faster - does this compensate the loss in accuracy of the evaluation? does this compensation change when the search goes deeper? cheers martin
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