Folding top pair to a tiny river bet on a four-flush board is a significant mistake given the excellent pot odds.
Flop Analysis
A small sizing is preferred here to keep the CO's wide range of underpairs and weak draws in the pot while we hold a massive range advantage.
**Ranges:** We have a significant nut advantage with AA and AK in our 3-betting range, while CO is capped at mostly A-x suited and pocket pairs.
**Sizing:** The 1/3 pot bet is effective on Ace-high boards because it forces Villain to defend marginal hands like 77-JJ or gutshots that are drawing thin against our TPTK.
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> **Takeaway:** Small c-bets on Ace-high boards maximize value by keeping the opponent's widest, weakest range in play.
Turn Analysis
Checking back is a solid choice once the flush completes. While betting is a viable mix, checking controls the pot and protects our range.
**Board:** The 6h is a dynamic card that completes the heart flush and the 45 straight. Our hand has shifted from a clear value bet to a hand that needs to reach showdown efficiently.
**Plan:** By checking, we induce bluffs on the river and can comfortably call most reasonable bet sizes on non-heart bricks.
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> **Takeaway:** When the board gets wet and the flush completes, checking back marginal top pairs prevents us from getting blown off our equity by a check-raise.
River Analysis
Folding here is a major error. Despite the four-flush board, the tiny bet size from the CO makes this a mandatory call.
**Math:** We are getting 4:1 on a call, meaning we only need to be right ~20% of the time. Villain's 1/4 pot sizing often represents a 'blocker bet' with a weak pair or a small Ace rather than a polarized nutted range.
**Ranges:** CO can have many hands that don't contain a heart, such as Ax without a heart or even a Ten that decided to bet for 'protection' or thin value. We beat all of these, and we occasionally chop with other AK/AQ combos.
**Blockers:** While we don't hold a heart, our lack of hearts actually makes it *more* likely Villain is bluffing with a hand like the Kh or Qh, though at this sizing, they are rarely polarized.
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> **Takeaway:** Never fold top pair to a tiny bet on a scary board without a specific read; the pot odds simply demand a call.
Note: Folding TPTK to a 25% pot bet is a massive over-fold; you only need 20% equity to break even, which you easily have against a wide CO range.