This PCG, which took place at the U.S. Amateur East 2012, features queenside castling by both players.
Round Five: Philidor Counter Gambit
Alan Gu (USCF 1791) - Michael O'Connor (USCF 1864), U.S. Amateur East 5/28/2012
1.e4 e5 2.Nf3 d6 3.d4 f5 4.Nc3 fxe4 5.Nxe4 d5 6.Ng3 e4 7.Ne5 Nf6 8.Bg5 Nbd7 9.c3 Bd6 10.Nxd7 Bxd7 11.Nh5 Qe7 12.Be2 O-O-O 13.Qb3 Qf7 14.Ng3 Rdf8 15.O-O-O Ng4
16.Bxg4 Bxg4 17.Rdf1 Bf4+ 18.Bxf4 Qxf4+ 19.Kb1 Qf7 20.h3 Bf5 21.Ka1 Bg6 22.f3 Qf4 23.Ne2 Qe3 24.Ng3 exf3 25.Qxd5 fxg2 26.Qxg2, and drawn in ? moves.