We should bet smaller on the flop to keep Villain's range wide, then fold river when the board texture heavily favors the aggressor's range.
After SB checks, we have a clear value bet with top two pair, but our sizing is slightly too large for this texture. Betting smaller (around 4.3BB) allows us to get called by a wider range of draws and marginal pairs like Ah7h or Kh9h.
Note: Sizing is too large; a medium bet (67% pot) is preferred over this 120% pot stab to keep Villain's range wide.
Checking back is mandatory here. The 6s is a disastrous card that completes both the spade flush and multiple straights (8x), shifting the nut advantage heavily toward the SB's calling range. **Board:** The texture is now extremely wet with three spades and a four-straight (6-7-9-T) possible. Our two pair has plummeted in relative strength and now functions as a bluff-catcher. **Ranges:** SB has all the flushes (AsKs, AsQs) and straights (88, 87s) that called the flop. By checking, we control the pot size and prepare to evaluate river runouts. --- > **Takeaway:** When the turn completes the most obvious draws, check back your marginal value hands to realize equity.
Folding is the correct GTO play. The Ks is a terrible river card, creating a 4-flush board where any single spade in SB's hand beats us, alongside all the straights that were already there. **Math:** We need 28% equity to call, but our hand only has about 24% against a range that is heavily weighted toward straights and flushes. We lose to almost every value hand SB chooses to bet here. **Blockers:** We do not hold a spade, which is a significant disadvantage. Holding a spade would make this a much closer decision as it would block a large portion of SB's value range (like JsTd or QsTc). --- > **Takeaway:** On 4-flush boards without a flush yourself, you must fold marginal made hands to significant aggression.