Redsales: No, no, I have no problem with playing against any sort of help, I'd say it's problem of the other player if he/she want serve only as an output device for some engine or a servant for somebody third. I'm trying (well, with little effort :-)) to improve MY PLAY and it doesn't really matter, wheather my opponent is using any sort of help (even Fritz) or not. We are not playing for money or eternal fame, are we? ;-) -- I'm only asking to be sure *I'm not breaking any rule or agreement here* if I'm ocassionally using books or/and database. I think, Rabbitoid answered my question (Thanks for the answer, R.!) exactly so as I understand the habits. I needn't have a guilty conscience about using my library or database.