Author: Claude Le Page
Date: 02:33:17 11/25/03
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Hello Uri! I think you are right about Nunn-style tournaments ; but why do you request that positions are not known in advance? the only difference is that with known positions it becomes a thematic tournament; why not? with thematic matches or tournaments you can make very exciting experiments : so when you see that an engine has difficulties with some type of positions you can make a thematic tournament to know whether it is the same with others; you can do it , either with a panel of prépared variations or with a specialized opening book:I have dozens of them!thus , I could make some discoveries about engines: Here is an example : in the Fegatello variation (known since 400 years) 1 e4 e5 2 Nf3 Nc6 3 Bc4 Nf6 4 Ng5 d5 5 exd5 out of book most of engines play 5...Nxd5 and still fewer can play 6 Nxf7 (Polerio) or 6 d4 (Jaenisch); only 2 of the CB engines pass the twofold test: shredder7 and junior7; junior8 passes only the first ; fritz8 and hiarcs9 pass none this learns very much about functioning of engines , as depth of analysis was sufficient (at least for fritz8) to avoid this trap:there is something else More (I come back to initial purpose) it gives a justification to the use of opening books: it avoids the engines to fall in these sort of traps: one could say : a chess engine is worth 1000 ELO in opening, 2000 in middlegame, 3000 in the endgame Friendly Yours Claude Le Page
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