Hum... For sure the composer is asking the solver to develop a sequence such that invisibles will be revealed in…
We don't know that for sure, despite the stipulation, the problem could be incorrect, insoluble.
Well, at least we know there is a # (mate) in the future. It is a given.
Which makes me think of this alternative: 1.PAe4+ Ic3 2.PAb4 Ixb4#. This should prove the white invisibles were e3Q and…
The definition of Invisibles says what is initially known and what might become known from the play. It requires some…
Oops. A cannon does not play checks diagonally. Forget adding a check symbol.
Stronger perhaps is adding a check (+) to Black's first, 1.PAb4+, determining position of invisibl wQ on c3 in the…
*to be able to effect
What about this solution?: 1.PAb4 Ib3 2.PAxb2 Ixb2# implying a white Q must have played to b3 yo be able…
Yes, I also agree that the "make" move should follow the moving possibilities of the captured piece at the time…