Any input on these books? They come highly rated by WGM Natalia Pogonina.
"Any input of these books?" Any of the books in particular? Are you thinking of buying the complete collection of 8 books? Or only the books on puzzles? or GM's Averbakh and Beilin's "Journey to the Chess Kingdom"? (which seems to be the only one that WGM Pogonina recommended.) Or the books on the Slav by Konstantin Sakaev or the Kalishnikov by Libiszewski?
Any input on these books? They come highly rated by WGM Natalia Pogonina.