Author: blass uri
Date: 00:34:11 12/25/99
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On December 24, 1999 at 20:00:48, Vincent Diepeveen wrote: >On December 24, 1999 at 18:39:00, blass uri wrote: > >>On December 24, 1999 at 17:17:01, Vincent Diepeveen wrote: >> >>>00:25 391314 (0) 8 -0.48 c2-c4 Qd8-h4 g2-g3 f4xg3 f2xg3 Rg6xg3 Nd5-f6 Ke8-e7 Qd1 >>>-e1 Rg3-h3 > >>This line shows that it does not see it for the right reasons. > >remember, the lines are from hashtable and it's a fail low, >obviously fail low doesn't show the correct line. > >>After c4 Qh4 g3 the right move for black is Qh3 and not f4xg3 >> >>The line f4xg3 f2xg3 Rg6xg3 is not clearly winning for black and I guess that >>deep thought expected this line when it played c4. > >>White can continue Qe1 Rh3 Qxh4 Rxh4 cxb5 and the question if g3 is better is a >>positional question and not a tactical question. >> >>The evaluation of programs after f4xg3 are less than 1 pawn for black. > >>c4 is a tactical blunder not because of this line but because of the line with >>Qh3 > >Right. It just already sees something that's evil enough. Very likely >not this line, but something that has to do with Qh3. We're just needing >a bound that's it. Then we get a fail low. I tried Genius3 with selective depth 0 after c4 Qh3 g3 Qh3 Rg1 and it needs 8 plies to see that Qxh2 is winning. so I guess that it needs 13 plies with no extensions before c4 to see that c4 is a tactical mistake. I see lines of 2 plies when I tell genius3 1 ply with no extension so 13 plies+no extensions is practically 14 plies. My point is that you need to see 14 plies to reject c4 for the reason of Qxh3 and not for a positional reason. If Deep thought had some rules not to extend wasting tempo lines that are also giving the queen for a pawn that it may explain the tactical mistake. Uri
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