Author: Uri Blass
Date: 06:56:17 01/28/05
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On January 28, 2005 at 09:19:47, Norm Pollock wrote: >Stefan, > >I would like to ask you why the commercial engines do not use a double book - >one book for moves as white and another for moves as black. By using one book, >based a single collection of games, black for example, is basing its opening on >games that black lost. > >-Norm I think that you are wrong There are moves that are marked by ? in the opening book of commercial programs so they are never played but a reply for them can be played. Here is an example from fritz8.ctg 1. e4 c5 2. Nf3 d6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 a6 6. Bg5 e6 7. f4 * all the moves except 7.f4 are marked by ? in the opening book of Fritz8.ctg I do not know if all of them are bad but at least they are considered to be bad by Fritz8 so I guess that Fritz8 will not play them but have reply for them in it's book(after 7.Qf3 Fritz has 4 different move for black in it's book). Uri
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