RE: Extra tough Christmas chess riddle (#69). / Knacknuss-Weihnachtsschachrätsel (#69).

7.. Nf1 Qxf1+
8.. Kxf1 Qb1+
9.. Kg2 Qg1+
10.. Kxg1 Bf2+
11.. Kg2 Black doesn't have more checks to give