Author: Uri Blass
Date: 06:23:29 11/22/05
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On November 22, 2005 at 07:22:15, Daniel Shawul wrote: >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 Note that I evaluate knight and bishop as more than 3 pawns and this is the reason that Movei usually does not trade rook and pawn for bishop and knight. Based on looking at Movei games bad trades is not the main problem of Movei and it is clear that if I give score for bad reade movei is going to be even weaker in the relevant position(Movei even without bonus for bad trade needs a long time to avoid Bc2 but at least it has good chance to avoid it at tournament time control because it fails low in few minutes). Uri
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