After betting flop and turn with a combo draw, river is a good spot to check back and give up rather than bluffing into a stronger, condensed range.
Flop 6s3cTs: we have a strong range advantage and a spade draw, so betting is preferred. Solver likes a medium c-bet (≈60% pot) to pressure underpairs and random overcards, but a small c-bet like 3.4BB into 5.5BB is a reasonable alternative that still generates folds and keeps our line flexible.
Turn 7h: BB’s range is now stronger, and we still hold a spade draw plus a gutshot to 9J. Solver leans toward checking more often here, but a medium barrel like 8BB into 12.4BB is acceptable—our draw is still live and we can fold if raised, while also charging 7x and pocket pairs that don’t improve.
River 4h: SPR ≈0.7, BB’s range is condensed and ahead overall, and our hand is now a missed combo draw. Solver prefers checking most of the time, with some all-in bluffs; checking back is the best option. Betting here would be a bluff into a stronger range, and our hand doesn’t block many of BB’s natural bluffs.