After flop check-raise getting called, the 4d turn gives us a strong straight; we should bet big, around 125% pot, to maximize value versus one-pair and draw-heavy holdings.
On Td 6c 5s, we have an open-ender plus a gutshot to a straight, but no made hand yet. This texture is very draw-heavy and connects well with BU’s opening range, so checking our entire range is the default. Solver likes to check this specific combo almost always, with only a small fraction of small donk bets.
After we check and BU fires 2.5 into 5.5, we can choose between calling and raising. Solver prefers calling with this combo, but mixing in some raises is fine. The key idea is that we don’t want to over-raise too often with just draws, but 87s is strong enough to raise for value and to pressure BU’s weaker pairs and draws. The 7.5bb sizing is reasonable, but solver leans toward an overbet raise when we do choose to raise.
The 4d turn completes our straight on a board that’s now 6-5-4-T with two diamonds. After BU calls our flop check-raise, their range is weighted toward one-pair and draw-heavy holdings. With a strong, non-diamond straight, we want to bet big to extract maximum value from those hands. Solver prefers a bet around 125% pot (≈25.6bb) here; our 16bb bet is on the small side and leaves money on the table versus hands like 66, 55, and strong draws.