Yeah, it's fine.
If you only use the blue diagrams then 1500 would probably be enough.
If you're worried about difficult analysis though, no problem, 1800 is good enough to get tons out of the book. Not that it's easy, but it's well worth the money.
For comparison, his analytical manual is more or less worthless to most players below a certain rating. This is not true for his endgame book though.
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