yes guido u r absolutely right i just want to give u here 1 small example may be no body believe me, i know a book author name munish gupta, authors of the Sicilian finale one of the best and strongest private book ever in pcc, sedat 5th place, i think all know abt that book , i saw my own eyes with team view he lost a match against 1 player in pcc and he tuned this line and next day same line he lost again with same opponent with a new move with same line and for this move answer he analyzed until 73 hours, yes 73 hours ( he keep his 1090t analysis move nearly 3 days) becz for this opponent new moves, he have 2 options 1, to change the full lines (other wise if anybody play this move with this line he will must lose)or analysis and find solution, after 73 hours he find out the solution with score i mean eval 030 and he added may be 10 moves and then find draw lines and still he not sure if its draw or not
see his patience ( this is called best authors)i think no body will analysis like that, in this situation all change that lines or just leave it . after that day i realized making book is no so easy. 1st need patience without this book making is 0 , and 2nd always work with 1 book if u lose with Ur book so badly or whatever but just keep working with 1 book after few months u will see Ur book running like ...
. after 3 years munish gupta book size 180mb, vasid chouhan book size 170 MB i think, and 1 of the best book maker Eros book size 156 MB after 7 years ( i talked with eros 2 or 3 times personally in pcc and he said to me last 7 years he is working with 1 book for his personal use and 1 database for others book makeing) . they make 10000 books from there data base for public but for own use or best competitions always play with 1 book.
1st need patience 2nd need best database ( best use playchess games and must need correspondence chess games http://www.iccf.com/content/index.php.
pcc games must select from Jan o until November 11 all Houdini engine blitz games select from 2550 rating and all long games with any ratings with all engines and correspondence games just take all complete games ) 3rd need to work with some book authors, those authors who have really good hearts and ready to share there ideas and then start to make books for that i know in play chess 1st vasid chouhan id- Don007, second munish gupta id- FX7_FX5, Alex_11 or Optimize prime, 3rd Marcos aka, id- Salvation creed, some time with Fx5_fx7. anytime when i need help they helped me any question regarding engine chess they have answer not only for me for everybody. they r d best senior helpful person in play chess.com, and rest ......