Well you always know that one of your counterfactuals is true.
and Transparent Newcomb is a bit weird because one of the four possible strategies just explodes it.
Well you always know that one of your counterfactuals is true.
There is no need to make that assumption. The whole collection of possible decisions could be located on an impossible counterfactual. Incidentally, this is one way of making sense of Transparent Newcomb.
Y'all know the rules: