Solution Haring 10:
Key: Knight f2 (tempo)
if1)..........Kf6 then 2) R x f7 mate
if 1)..........Kf5 then 2) R x f7 mate
if )1).........K d6 then 2) R x d7 mate
if 1) .........Kd5 then 2) R x d7 mate
if) 1).........d6 then 2) R x g5 mate
if 1)..........d5 then 2)R x f7 mate
if 1)...........f6 then 2) R x c5 mate
if 1)...........f5 then 2) R x d7 mate
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