Imagination in Chess
"... In general I would say that the exercises probably are very good training, but very difficult for a lower rated player. …"
http://seagaard.dk/review/eng/bo_misc/ba_imagination_in_chess.asp?KATID=BO&ProductID=346&ID=BO-Misc&PUBID=BA&AUTID=176
"... One can recommend ... Paata Gaprindashvili’s Imagination In Chess ... which came out in 2004 by a hitherto unknown author, acquired cult status among hardcore chess studiers looking for training material besides the standard tactical puzzles. …" - IM John Donaldson (~2010)
http://dev.jeremysilman.com/shop/pc/Critical-Moments-In-Chess-p3810.htm
I don't have the Psakhis book.
My very rough estimate of difficulty would place Imagination in Chess somewhere between Averbakh's Tactics for Advanced Players and Volotkin's Perfect Your Chess. I would estimate the ideal level for these three books as something like this (using FIDE ratings):
2100+ Tactics for Advanced Players
2200+ Imagination in Chess
2300+ Perfect Your Chess
Of course, those are just estimates. Some people can be very strong or weak in tactics for their rating. You could also subtract 100-200 points from those estimates for very young or ambitious players.
I’m finding Imagination in Chess interesting. Can do about 2 in 3 positions so far, but each takes quite a long time.
I’m finding Imagination in Chess interesting. Can do about 2 in 3 positions so far, but each takes quite a long time.
All three of them are quite good, IMO; a step above your typical book with 1,001 tactics problems.
The Averbakh book has more text than the other two, as it is trying to set forth a general theory of tactics so there are some short "essay" sections. But it also has a lot of interesting problems.
The Volokitin book is also good but some of the problems are very difficult.