A6o BB on 865r: The Nut Blocker Trap

Hero
A♠6♦
Position
BB vs SB
Pot
Single-Raised Pot
Flop
5♠ 6♠ 8♠

We turned a massive combo draw into top two pair, but the river check-raise from Villain signals a range that beats everything but the absolute nuts.

Flop Analysis

Calling is the only play here. We have middle pair plus the nut flush draw, giving us massive equity against SB's c-betting range.

Turn Analysis

Checking back is fine, but betting small is strongly preferred to capitalize on our massive equity and deny equity to SB's random air. **Board:** The 4h is a very dynamic card that adds a gutshot to our already strong pair and nut flush draw, making our hand extremely robust. **Ranges:** We have a significant range advantage (61% equity) because we have all the straights and flushes that SB might check to protect their range. **Plan:** By betting small, we charge SB's overcards and weak draws while remaining comfortable if raised, given our nut redraws. --- > **Takeaway:** When you pick up massive additional equity on the turn, lean toward betting to maximize the pot and deny equity.

Note: Checking back misses a high-frequency value/protection bet with a massive combo draw.

River Analysis

After SB checks twice, betting for value is mandatory once we river top two pair. **Ranges:** SB's range is heavily capped after checking twice on this board. We expect to be ahead of Ax, 8x, and missed straight draws that might hero-call. **Sizing:** The 70% pot sizing is effective here; it targets Ax heavily while keeping the pot manageable if we are somehow behind a slow-played monster. **Blockers:** Holding the As is crucial—it blocks the nut flush, making it less likely SB is trapping with the best possible hand. --- > **Takeaway:** When the river improves you to a strong two-pair against a capped range, bet for value.

River Analysis

This is a disciplined fold. While we have top two pair and the nut flush blocker, SB's check-raise on this specific board is incredibly polarized toward straights and flushes. **Ranges:** SB's line (Check/Call, Check/Check, Check/Raise) is rarely a bluff at these stakes. They are representing 7x straights or flopped flushes that decided to trap. **Math:** We need over 37% equity to call. Against a range of flushes and straights, our two pair has near-zero equity, and SB has very few natural bluffs that take this line. **Blockers:** Although we have the As, SB can still have many suited spade connectors (9s7s, 4s3s) or straights (7x) that don't require the As. --- > **Takeaway:** A river check-raise on a four-straight, three-flush board is almost always the nuts; don't let two pair become a 'way-under' bluff catcher.

Note: Calling the river check-raise is a significant error; two pair is crushed by Villain's value range on this board.

Key Concepts

  • 11.2
  • Villain Slight Advantage
  • IP
  • Wet Board
  • POT CONTROL