Author: Bernhard Bauer
Date: 06:50:07 09/24/01
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On September 24, 2001 at 05:48:50, Uri Blass wrote: >On September 24, 2001 at 05:14:10, Jari Huikari wrote: > >>I'd like to find information about history of computer chess: >>When alpha-beta was invented and other 'milestones'. >> >>And if I remember right I have seen here an estimation about >>how many different chess positions there are. >> >>And finally I'd like to get those strange positions where Fritz >>couldn't find easy mates: another was a zugzwang and mate wasn't >>found because of using null move > >I remember this position when old versions of Fritz could not solve but >unfortunately Deep Fritz can solve it. > >[D]kbK5/pp6/1P6/8/8/8/8/R7 w - - 0 1 > >Deep Fritz seems to be lucky here because I remember cases when it could not see >simple things because of null moves including a case when it fail to see >a simple win against Junior in comp-comp game because of null move pruning. >(Junior saw something like 10 pawns against itself when Deep Fritz saw nothing >and after Deep Fritz's mistake it was almost equality) > >The comp-comp game was based on my correspondence game against the female world >champion luba kristol. > >Unfortunately I am too lazy to look for this comp-comp game now. >I remember that Deep Fritz found the right move at short depthes in that game >but later it failed low every iteration without main line until Deep Fritz saw >another move. > >I already posted few years ago a position when the right move leads to a >zunzwang and Fritz5(at that time) found the right move but also failed low every >iteration without solving the fail low. > >It seems that chessbase does not consider that problem as important and I do not >believe that Deep Fritz is losing more than 5 elo in rating because of that >problem. > >Uri Now DeepFritz even solves some studies involving zugzwang like [D]2q5/8/6p1/B6p/7k/7P/R5PK/8 w - - and [D]8/6p1/1p6/p7/kq2Q3/8/K7/8 w - - You may try both positions with crafty :) Kind regards Bernhard
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