Multiway we should check more often on the flop and turn; once we raise turn and miss river, checking is preferred, but shoving is a reasonable value jam.
Four-way to a Q85ss flop with SPR ≈4. Multiway, we should lean toward checking more often, but a small c-bet with top pair + nut flush draw is fine. Betting around half-pot works well to pressure underpairs and random floats while still keeping our overall strategy somewhat balanced.
Turn Jh is a big card that connects well with CO’s opening range; SB’s tiny lead into two players is often a stab with a draw or weak showdown. With top pair + nut flush draw and excellent pot odds, calling is preferred; raising mostly gets action from stronger hands and folds out the weaker ones. Solver prefers calling here, and the large raise size is a bit too ambitious multiway.
Note: Turn raise is too big and too ambitious multiway; calling the small donk is higher EV with top pair + nut flush draw.
River 4h, SB checks and we’re left with top pair and a missed flush draw. Solver prefers checking this combo a lot, but jamming is also reasonable as a value bet versus worse queens and pairs. The shove is a bit thin but still acceptable given the board and SB’s capped range.