Made flush on the turn. River puts 4 to the flush.

[teajay]

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First off, you don't know that SB will call.

BB might be bluffing here or betting a good but non-flush hand.
He was agressive the whole hand through.

It's true, while a bettor can bluff a caller cannot and you need a stronger hand to overcall.
But he might aswell just have a low spade or a strong not-flush hand and doesn't believe BB has him beat and/or just wants to show down his hand.

We have the third nuts here and there are a bunch of hands that could call that we beat.
The pot is huge, IMO it's for sure that we win more than 5% of the time (even if it weren't 0.05/0.10 where a call would be even easier).

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My thoughts exactly.
I was trying not to mention the fact that it was 0.05/0.10 as well, but it may have even more impact.

This board was fairly coordinated the whole way. The possibility of someone calling with two pair, a made straight and I wouldn't be surprised if sometimes only a K or Q will certainly make up the 5% you need.