When we 4-bet preflop and flop an overpair on a dry board, we are committed to the pot and must stack off against aggression.
Flop Analysis
On this dry, low-textured board, we have a significant range advantage and should bet frequently to extract value from BB's pocket pairs and top pairs.
**Ranges:** BB's 4-bet calling range is condensed, featuring hands like JJ-88, AQs, and some A5s-A4s. Our KK is well ahead of this range, losing only to rare sets of 99 or 77.
**Sizing:** A small sizing (25-30% pot) is effective here. It keeps BB's range wide, allowing them to continue with hands like TT or 88 that might fold to a larger sizing, while still setting up a turn shove.
**Board:** The rainbow, 9-high texture is very safe for an overpair. There are no flush draws and only limited straight draws (like 86s or 65s), making our hand extremely robust.
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> **Takeaway:** On dry boards in 4-bet pots, use small sizing to keep your opponent's marginal range in the pot.
Flop Analysis
When BB check-raises, we have a pure stack-off. The SPR is so low that we cannot fold an overpair, especially one that doesn't block the most likely bluffs.
**Math:** We are getting over 3:1 on a call, needing only ~24% equity to continue. With 77% equity against the range, folding would be a massive theoretical error.
**Blockers:** By holding KhKs, we do not block any of the backdoor flush draws or straight draws BB might use as bluffs. We also don't block the Ax hands they might overplay.
**Plan:** Since the effective stack is already committed by the raise, moving all-in is the standard way to realize our equity and ensure we aren't bluffed off the pot on scary turn cards.
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> **Takeaway:** In low SPR situations (under 2.0), an overpair is effectively the nuts; never fold to a single raise.