thank you . the video picture is very clear that if we keep and look after. I am learning to make line. what does the blue sign?
Mark moves either red (means they won't be played ever) or green (mean they will be picked, with a probablility given by the % column). To make a move red right click on it and select Don't play in tournament. To make a move green right click on it and select Main Move. You might want to make a move red if you find that at some point in the book line you had a negative evaluation and therefore you can mark that move red so it won't be played again. These are the colours used in ctg books. Note that the colours only have any influence on engine play if Tournament Book is ticked in Book Options :
Black - program will play the move based purely on statistical performance in tournaments ie. if the statistical performance is good it will be selected.
Green - program will play the move regardless of the statistical performance.
Red - program will NOT play the move regardless of the statistical performance
Blue - dubious move
Grey - the move was never actually played in any of the games in the dtaabse the book was made from, but leads to a position that results from some other line
If you right click on a book move the top 2 entries you see allow you to mark the move with a punctuation. The top set are to mark a move and the second set down are to mark a position. A Blue move is a move that has been marked as ?! which means "Dubious Move". The other ways you can mark a move and a position are are:
?!: Dubious move
!?: Interesting move
!: Good move
‼: Brilliant move
=/∞: With compensation
=: Even position
+/= (=/+): Slight advantage
+/− (−/+): Advantage
+− (−+): Decisive advantage
Hope this helps you,