Betting small on the flop and turn with second pair protects your equity and denies free cards to the many draws present.
Flop Analysis
Checking is a viable mix, but betting small is preferred to protect our second pair against the numerous draws on this wet board.
**Ranges:** We have a slight range advantage (53.6% equity) and a nut advantage with more Ax and high pocket pairs. BB's range is wide and contains many hands like 5d2d or Qc7h that we want to fold out now.
**Board:** The Ace-high texture favors us as the preflop aggressor, but the 5h6sAs is dynamic with a flush draw and straight potential. Checking back allows BB to realize equity for free with their many high-card hands and gutshots.
**Sizing:** A small sizing (20-33% pot) is ideal here. It forces BB's air to fold while keeping their range wide enough for us to extract value from weaker pairs or draws.
---
> **Takeaway:** On Ace-high boards with second pair, bet small to deny equity to the bottom of Villain's range while keeping the pot manageable.
Turn Analysis
Betting the turn is correct after the flop went check-check. We now have the nut flush draw to go with our second pair, giving us significant equity even if called.
**Ranges:** The 9s is a better card for the BB's range as it completes straights (78) and improves their spade draws. However, our specific combo with the Ks is a high-frequency bet because we block the nut flush and can comfortably barrel most rivers.
**Board:** The board is now very wet with both flushes and straights possible. By betting, we protect our hand against random high cards and charge Villain's remaining draws like QdTs or Kh7h.
**Plan:** If called, we are looking to check-fold on most non-spade rivers if Villain bets big, but we can value bet if we hit our King or a spade.
---
> **Takeaway:** When you pick up a nut flush draw to go with a made pair, increase your aggression to maximize equity realization.