Solution
I declare and
as winners of this round. (Due to the big number of comments, at first unintentionally I didn't notice that also
found the solution ...)
White wins after:
- Na2! (quite surprising ...) Qxb8 (also other moves don't help)
- 0-0-0! Qxa2 (moves like Qf1 only delay the checkmate)
- Rh1# (checkmate)
End position:
I add one side variation because it's nice as well:
- Na2! Qf1+
- Kxf1 Qxb8
- Kg2! (the fastest win; black is lost)
RE: Chess problem 56 / Schachaufgabe 56