I think you're right! 2.PAxa2 seems to be a dual/cook. The move implies that the second white invisible is standing…
Wait a minute! Something is wrong about the way the problem is posed. In a normal, visible h#2 with two…
Right. I understand what can be written (deduced) now. I accidentally responded outside of this thread yesterday, explaining I had…
I understand first solution now, and in general what I- for the notation means. The second, with the castling, I…
Crossed messages Nikola, I answered to Mike.
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…