I am sorry, but the third solution seems to me only as a random product of the solving program. But…
But change of function feature, is it not lost?
This idea can also be easily processed in an orthodox way, for example: White Rh7 Rg4 Bc2 (+wK wherever) Black…
Dear Juraj, To clarify,while the 1,3 solutions show echomates, 1 and 2 show change of function (WR,WF).
Sorry the first solution was added later.
Actually the first two solutions were composed first, showing change of function of White rook and bishop !
I agree. Only reason could be that the author wanted the key also to open & close lines!
Another "silent feature" of this is the fact that both thematic mates close the 5th rank so that after1...Rd5 the…
Well done Bernd! Indeed with a so tricky move order, it would have been very risky to publish this PG…
You are right Joost. I would prefer the original version, but unfortunately anticipated.