It was my Bishop that did it, but...
I won this correspondence chess club tournament game yesterday with a 4-piece combination checkmate that I don't remember ever having used before. It is, of course, my Bishop on the c8 square delivering the kill stroke to the White King. But all the possible flight squares available to that White King are covered by: my Black Queen, my pawn on the d6 square, and by my Black King himself. So my Bishop did it, but he had a lot of help.
Our board at game's end is shown above, and our full move record is below:
1.e4 d6 2.d4 b6 3.Nc3 Bb7 4.Nf3 Nf6 5.Bd3 g6 6.h3 Bg7 7.Bc4 O-O 8.Ng5 e6 9.Bxe6 fxe6 10.Nxe6 Qe7 11.Nxf8 Bxf8 12.Qf3 Nc6 13.Bg5 Bg7 14.O-O-O Rf8 15.Rhe1 h6 16.Bxf6 Rxf6 17.Qg3 h5 18.Nd5 Bh6+ 19.f4 Bxf4+ 20.Nxf4 Qf7 21.Rf1 Qxa2 22.d5 Nb4 23.Nxg6 Qa1+ 24.Kd2 Qxb2 25.Ne7+ Kf7 26.Ng8 Qxc2+ 27.Ke1 Rxf1+ 28.Kxf1 Qxd1+ 29.Kf2 Qc2+ 30.Kf3 Qd1+ 31.Kf4 Qd2+ 32.Kf5 Bc8# 0-1
And the adventure continues.
- by Roscoe