Play for winning advantage calculation puzzles

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Chessmo

I am looking for a dozen or so play for a winning advantage puzzles that are pretty hard for a <2000 player that will require me to calculate and evaluate various lines and choose the best one. I am NOT looking for puzzles where you just have to find a winning tactic or mate -- they need to be less absolute wins.

Any suggestions on a source for these on chess.com or online?

pokerram

Chess step books set 5 and above mix books .no hints and you have to find the answers online .just gone thru set 4 mix book 64 pages mostly 12 puzzles a page