KTs donkbet turn

Sounds good. By donking here when third spade comes you maximize your fold equity. You hand is strong enough to play for stacks here and when you block nut flush draw it would be super difficult for villain to call here. He might go broke with AA but not many other hands.

Just fold flop... too expensive to be profittable in the long run.

very unexpected offer to fold the flop

Imho nh, you can also cr turn

I might fold flop with KcTx but now we have 2 backdoors and other one is to the nuts.

btw could we xr otf?

I think we can check/raise this flop with backdoors to the nuts. As played, I guess donking, check/calling and check/raising turn are all fine.

If we watch the backdoors then we can xr. Fold>xr>call.

We have 15 fake outs, all :spade:, all :Jx:, all :7x:, on the flop that actually gives us real outs.

Bottom line: If you think OOP floating is profitable at NL50 (it probably isn't at the micros), then bluffing turn is a no-brainer. If not, fold flop, but don't check-raise bluff there with backdoors only. It would be so, so silly, since there are so many hands better for bluffing (hands with real outs).