unfortunately,worst ennemy of poker is not on ffp PS list........

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but yeah i hear about that book, i should take a look into it
but is psychology simply not just worth getting then, since i have inside poker mind and will probably buy worst ennemy of poker?
ps: worst ennemy poker takes some idea from is previous book and add it new info around it(worst ennemy),or is it just totaly new info in it?
ty for anwering