[bav]

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To me, it's obvious the minimum raise amount is 800.

I believe the minimum raise amount should be applied to the current total bet of 1,000.

After all, when you say raise, you're indicating that you're raising the amount of the current bet, not the previous bet. Also, if you say the player acting after the all-in can minimum raise to 1,600 (for only 600 more than the current bet, with the big blind at 800) then you are allowing him to do something that other players likely will not be able to do, that is, raise for an amount less than the minimum raise without going all-in.

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I definitely prefer this answer myself. It avoids some unpleasant other situations. Consider:

SB=400, BB=800, UTG allins for 1500 (700 more), UTG+1 calls 1500, UTG+2 says "raise".

If you earlier said it was ok for UTG+1 to raise to 1600 in this situation, then is it still ok for UTG+2 to raise to 1600? That would be seriously unfair to UTG+1 to allow UTG+2 to bump it only 100. And would that reopen the action for UTG+1? Well...any raise other than an all-in SHOULD reopen the action, but if you let UTG+2 in for 200 it doesn't; just ain't fair to let UTG+2 raise without any fear of a reraise from UTG+1. But if you were willing to let UTG+1 raise from 1500 to 1600, how can you prohibit UTG+2 facing the same bet size from doing it now?

Seems like things just kinda fall apart in some situations if you don't demand that a raise always has to be applied to the biggest action.

Course it can still be messy. Let's get silly:

SB=400, BB=800, UTG all-ins for 1500, UTG+1 all-ins for 2200, UTG+2 raises to 3000, UTG+3 all-ins for 3700. (Summary: 3 partial-raise all-ins, one real raise so far.)

UTG+4 says "raise". Other players say "he can't, there have been 4 raises so it's capped." UTG+4 says "there has been 1 raise, none of the all-ins were complete." Gulp--figure out an answer. Now repeat it where each all-in added 100 instead of 700--does that same logic apply? Suddenly seems like the limit half-bet rules would make sense here.

Gotta loves rules lawyering.