Mate in 7
A pretty elaboration of an old idea.
1.Ra8 cxb4 2.Sa7 K any 3.Sb5+ Kb1 4.Sc3+ bxc3 5.Rg1 c2 6.Sf1 B any 7.Sd2. The Indian is the oldest of chess problem themes, involving a move across a critical square followed by an interference to relieve stalemate. Here it is beautifully echoed on file and rank.
Guy Meissonnier: The old Indian theme with two white rooks and two white knights!