[jeffnc]

No, it's not "outdated". The ideas are sound, and provide a good base even if you are playing against players who have advanced beyond it. Even if some top players don't play exactly that way, they still know how to, and they still need to be aware of who's playing that way. Then again, lots of players you play against will not even have absorbed that material, let alone done more advanced things.

Snyder's book does not supercede it, it augments it. Harrington's M ideas are not 100% fleshed out, and Snyder helps fill in some details related to increasing blind speed, "making plays" in position, leveraging a large chip stack, etc. I'd read Harrington first and Snyder second, possibly among other books.