Chess: A Knight's Tour

Position No. 6138: White mates in three Solution to Position No. 6137: 1.f7! Rxa6+ 2.Nf6 Ra8 3.Ne8 Ra6+ 4.Kg5 [avoiding K-f5,R-a1-f1] Ra5+ 5.Kg4 Ra4+ 6.Kg3 Ra3+ 7.Kf2 Ra2 8.Ke3 Ra3+ 9.Ke4 Ra4+ 10.Ke5 Ra5+ 11.Ke6 Ra6+ 12.Kd7 Ra7+ 13.Nc7 The pawn queens. It was only a few decades back that chess was an adult game. [...]