![[ph]](/mwf/v12/flags/ph.png "Philippines")
Hi!
I have questions about Rybka Books in Chessbase CTG format before I buy it.
1. Does Rybka 4 Book in chessbase have the same lines and variations as in the Aquarium version?
2. Since R4 book is made a another author(Jiri Dufek), I wanna ask if he used R3 book(by Jeroen Noomen) as it's foundation or is R4 book a different book? Because there are variations in R3book that I already love.
3. Are there any engine tests that prove R4 book is better than R3 book?
Thanks in advance
I have questions about Rybka Books in Chessbase CTG format before I buy it.
1. Does Rybka 4 Book in chessbase have the same lines and variations as in the Aquarium version?
2. Since R4 book is made a another author(Jiri Dufek), I wanna ask if he used R3 book(by Jeroen Noomen) as it's foundation or is R4 book a different book? Because there are variations in R3book that I already love.
3. Are there any engine tests that prove R4 book is better than R3 book?
Thanks in advance
![[us]](/mwf/v12/flags/us.png "United States")
If you dig around with google I think you can find an interview that talks about how the R4 book was made. I would expect it to be significantly stronger than r3 book but both our quite old at this point.
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