Yes, both second and third solution have an "invalid promotion" on the mating move. Also, it should me marked that…
Sorry, but the symmetry is absolute. In all phases there are four identical WTP positions (diagram and after the first…
Unfortunately, the twin is exact copy of original problem - it is a symmetric reflection of the board. And this…
In fact it looks like the only reason Transmuting King is used is to avoid some duals on the mating…
>It’s explicitly said that a King can not be captured. This is a very unfortunate rule, because in orthodox chess…
This is a thin ice, as there is no strict definition of "capture of king". But in my opinion "check"…
I am not sure, but it looks like after capture on a1 and any promotion promoted piece is rebirthed and…
A great concept! But just by exchanging places of Ph7 and Ph3 it is possible to have one solution and…
I think that historically first problem with this kind of fairy condition is the problem of Carl Eckhardt (WinChloe ID…
There was a good article on this issue by Branco Pavlovic in Problem 95-98 (fifty years ago!).