Funny river spot with 66, NL50

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I call a half pot - up to about 2/3 river bet here I think - but not full pot unless I has a note saying "bets full pot on river when bluffing" or something like that.

He just isn't bluffing often enough to make it profitable I think - he's VBing a T oddly or has Q4dd or QT or Qx more than half the time I'd guess, even tho his line does look bluffy.