RE: Extra tough Christmas chess riddle (#69). / Knacknuss-Weihnachtsschachrätsel (#69).
4.. g4+ Kh6 5.. Rc8 Kh7 6.. Rf8 checkmate is unstoppable on h8, White must avoid checks
RE: Extra tough Christmas chess riddle (#69). / Knacknuss-Weihnachtsschachrätsel (#69).