Re: AA Runs Into Four Flush
 

Let's say SB is holding something like T[img]/images/graemlins/heart.gif[/img], T[img]/images/graemlins/club.gif[/img] (or any reasonable defending hand without a diamond). MP1 raises and he decides to defend. Flop comes with three diamonds and he check/calls.

When a fourth diamond (a king) comes on the turn, SB has an automatic bet situation. If he is behind, he is likely drawing dead. If he checks, MP1 will automtically bet and SB will have to fold.

This is a perfect opportunity for SB to donk and represent a diamond. There is a possibility that MP1 will fold and SB takes down the pot. If MP1 calls the bet, SB can check/fold or check/showdown on the river. If MP1 raises, SB can easily fold.

It may look to MP1 that SB hit his flush draw after check/calling on a three-flush board and then leading when the four-flush hits on the turn.

But, if we dive a little deeper into the world of SB, it would look more like a flush if SB check/raised the turn. I suppose a read here would actually be more helpful than I initially suspected.

Re: AA Runs Into Four Flush
 

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Could a river bet possibly scare off a small diamond?

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Almost never, and it usually shouldn't (he only has to beat you one time out of six to make the call profitable).

90% of the time he'll only fold if you can beat him, which makes a bet kind of useless either way.