https://www.janko.at/Retros/Records/ShortestKnightMate/index.htm Found one of the missing SPGs from the list. Single Checkmates, by Knight itself Knight to the 6th rank a 1.Nc3 d5 2.Nxd5 Be6 3.Nb4 Qd5 4.e4 Nd7 5.Ba6 0-0-0 6.Bxb7+ Kb8 7.Bxd5 Rc8 8.Na6# C+ by Natch 3.3 Kind regards Christoph