Key: 1.Ra3! Sxa3/Bxa3 2.Rxa3 Bxa3/Sxa3 3.bxa3 Kg2 4.a4 Kg3 5.a5 Kg2 6.a6 Kg3 7.a7 Kg2 8.a8=R Kg3 9.Kf1 Kxf3 10.Ra3#
Nearly identical first, second, and mating moves. Underpromotion. Model mate.
Comments:
b2 effects the mate with a similarity to Loyd’s original Excelsior (in each case the b2 pawn effected the mate, in Loyd’s as queen on a8, in ours, promotion also occurs on a8, but a rook, and a delay of the mate). Nearly identical 1st, 2nd, and last moves. 1.Ra7-a3! 2.Ra8-a3! 10.Ra8-a3#! (Authors).
