Author: Harald Faber
Date: 05:26:33 07/27/01
Once upon a time... ...there was a player who really dared playing a serious game vs Junior 7 (no, not me). The game started with 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Qc2 0-0 5.a3 Bxc3 6.Qxc3 In the Junior 7 opening book there are 8 (!) book moves available for black (Junior 7). 7 of them are red-coloured, certainly restricted. The only move remaining, blue-coloured, is 6...b7-b6!?. But Junior starts to calculate the next move. Referring to the data for that move, the base are 563 games which have been included into this book. The performance in percent for this move is 48%, what gives an absolute performance of 2552, considering an average ELO of all opponents of 2585. "Prob" has a value of 80.8%, in the column [%] there is a 0% value as final playing preference. This leads to the following questions: 1. What does a blue-coloured move mean? 2. What is the difference between a green-coloured and a black-coloured move? Green = user changed? 3. Why has the absolute percentage for playing the move a value of 0%? 4. Is it a bug that I cannot change the move b7-b6 to a main move? It seems to be a bug in Junior 7, in the Fritz 6 GUI it works. 5. Why is this main move not set as default to 100% final playing percentage? The story continues: 6...d5 7.Bg5 h6 8.Bxf6 Qxf6 9.e3 Nc6 10.Nf3 Junior calculates again, although there are three bookmoves again: a7-a5!?, b7-b6?! and Rf8-e8. OK, a7-a5 and b7-b6 are blue-coloured again and have no games as base for the book. But Rf8-e8 has 2 games, perf. 25%, opp.av.=2485, perf.2411, the rest is set to 0%. The only difference now is that this move can be turned into a main move. Anyone here who can explain that to me? Maybe one should take a closer look at the other ChessBase opening books too, maybe there is similar behaviour?! Thanks in advance!
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