Author: Daniel Shawul
Date: 04:22:15 11/22/05
Go up one level in this thread
On November 22, 2005 at 03:52:57, Uri Blass wrote: >On November 22, 2005 at 03:10:35, Ernst Walet wrote: > >>...makes me sick in the stomage. >> >>QUOTE >> >> When you play through this game, take a look at the forced sequence commencing >>with Fritz’ …Bc2, and count how many ply there are from there to the position >>when Matthias Feist resigned on Fritz’ behalf. Then add a few more ply because, >>in the final position, although Black will inevitably be saddled with a decisive >>material deficit, at that moment the program still had two minor pieces for a >>rook. So the depth to which Fritz would have needed to search in the critical >>variation, in order to realise that …Bc2 was a losing move rather than a winning >>one, was quite beyond the program’s capability. >> >>UNQUOTE >> >>So much for the human like "knowledge" of Fritz. >> >>Ernst. > > >This position is from the game > >Fruit has no problem to evaluate it by static evaluation as advantage for white. > >It has no "human" knowledge about bad trades. >Note that this is not the only explanation and Movei also has no human knowledge >about bad trades(it simply evaluates bishop and knight as more than 3 pawns so I have tried not giving bonus for bad exchanges but it didn't work for me. Especailly in tactical positions because the program will spend evaluating positions where it is down by a minor, but still trying to compensate it by positional means. Fritz may be giving a big bonus for the excahnge, and this combined with some pruning may prevent it from searching for positional compensaiton further. For example in your position below scorpio gives -132 for white, but search will reveals white is +350 with a6! I chose it to be this way . When the bad trade code fails like it happened to fritz it will be noticed! but not giving bonus is not smart either. Fruit / Movie will be disadvantaged in postions where the bad trade is really helping. Daniel >it usually avoid bad trades) and it seems that fruit simply has superior >knowledge about pawn structure. > >6: Ponomariov,R - Fritz, Man vs Machine II 2005 >[D]8/P4pk1/2bp4/P2p4/2nPp2p/4P2P/6K1/2R5 w - - 0 1 > >Analysis by Fruit 2.2.1: > >47.Kf2 > = (0.24) Depth: 1/6 00:00:00 > > >Uri
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