Author: Eran
Date: 10:41:04 12/26/02
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On December 26, 2002 at 10:24:03, Drexel,Michael wrote: >On December 26, 2002 at 07:50:19, Eran wrote: > >>I understand that the advantage in Fritz is that the nullmove search does an >>excellent job in middle games, but its disantvantage is that it does not do very >>well in end games especially in some decisive mates. That is why ChessBase >>provides a special mate solve engine for that. Correct me if I am wrong. >> >>Eran > >here is a nice example. hope everything is correct this time. > >[D] 8/5K2/3N3N/8/5k2/7B/5B2/8 w - - 0 1 > >this problem was created by Fritz 4 (with a little help of mine) long ago. >white to move and mate in 4 > >Crafty 19.01 (native CB), Ruffian 1.0.1 (UCI) and Fritz 5.32 find the mate in 4 >almost >immediately and showed correct evaluation in analysis mode. > >Fritz 7.0.0.8 engine find the mate in 4 too. >the engine showed only a mate in 5 in analysis mode nevertheless. > >Shredder 7 dont find mate in 4. >confronted first time with this position Shredder would mate you in 5: 1.Bg2 Kg5 >2.Be3+?! > >Comet B54 (native CB) is funny. >it announced a mate in 15 and would play it (even without tablebase support) >because >it finds a forced way to convert the position into a won endgame bbk v. k > >I know that this is not important regarding playing strength of engines. >most freeware engines find the mate in four immediately >and some of the strongest commercial engines did not find it at all. >if you need an engine for solving chess problems try Crafty or Ruffian first. Okay, I understand that. Regarding the nullmove search, when I play a tournament time-control game against Fritz I hope it plays a very strong endgame after a middlegame(I feel certain that it plays very strong in most endgames). If it happens to play one weak or stupid endgame, then the whole game against it is worthless. The nullmove search is wonderful for any game but it might overlook some best moves especially in endgames - that may be a problem. Anyway, Fritz is my favorite chess program. There are many other great chess engines on the Internet, but that is too much for me. :-)) Eran
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