Mate in 5

Most attempts by the rook to mate are currently met by adequate defences, so White must induce the black pieces to get in each other’s way. 1.Ra8? threat 2.Ra5, but 1...d2!; 1.Rd8? threat 2.Qd4, but 1...a1Q!; 1.Rf8? threat 2.Rf5, but 1...Sg3! 1.Rg8! threat 2.Rxg5. 1...Rg3 2.Rf8 Bg4 3.Ra8 Rb2 4.Rd8 Rb4 5.Qxc6.

Dafydd Johnston: Faced with a choice of four ways of threatening mate in one, White must shuttle the rook back and forth to force replacement of good defences by bad ones (the Dresden theme), culminating in a self-block on b4. A nice logical sequence.

Jacob Hoover: We have three tries, which all become viable after the key. Also, the post-key play is a single line containing multiple Dresden decoys, which was a very nice touch.