A5s BU on AT9r: Value Missed on the River

Flop Analysis

Calling the small c-bet is mandatory. We have top pair and backdoor flush potential, and the price offered is too good to consider folding or raising yet. **Math:** Getting 4.2:1 on a call, we only need ~19% equity to continue. With top pair and a backdoor heart draw, we have roughly 57% equity against a standard 4-betting range. **Ranges:** CO's small sizing often includes their entire 4-betting range, including AK/AQ, but also underpairs like KK-JJ and bluffs. We aren't afraid of much here besides exactly AA, AK, or sets. --- > **Takeaway:** In 4-bet pots, don't over-react to small c-bets when you hold top pair; call and let the board develop.

Turn Analysis

When the preflop aggressor checks this turn, we must bet. Our hand has improved to include a nut flush draw, and we need to extract value from their 'hanging on' pairs. **Sizing:** A small sizing (around 25-30% pot) is ideal. It keeps the SPR manageable while making it difficult for Villain to fold hands like KK, QQ, or JJ that are now bluff-catchers. **Plan:** By betting small, we set up a comfortable river shove on most bricks. If Villain raises, we have the equity of top pair plus the nut flush draw to potentially continue or jam. --- > **Takeaway:** When the 4-bettor checks an Ace-high turn, they are often capped; use a small sizing to keep their marginal hands in the pot.

River Analysis

Checking back here is a significant value loss. Villain has checked twice, effectively capping their range to marginal pairs or total air that gave up. **Ranges:** Villain almost never has AK, AQ, or sets after checking the turn and river. Their range is heavily condensed into pocket pairs (KK-JJ) and perhaps some weak Ax. We are an 89% favorite. **Math:** With an SPR of 0.46, the only logical move is to shove. We need to maximize the times Villain feels priced in to call with a hand like KK or QQ. **Blockers:** Our Ah is a double-edged sword; it blocks some of Villain's potential heart-based bluffs, but more importantly, it confirms we have the best Ace-high holding relative to their likely calling range. --- > **Takeaway:** On clean rivers with a very low SPR, do not check back top pair when your opponent has shown capped weakness—shove for value.

Note: Checking back misses a mandatory value shove; with an SPR under 0.5 and Villain showing weakness, we must jam to extract value from their marginal bluff-catchers.