[Event "It"] [Site "masterchessopen.com London (England)"] [Round "4"] [White "Mackenzie Arthur John"] [Black "Mueller Oscar Conrad"] [Result "1-0"] [ECO "D51"] [Opening "QGD: 4.Bg5 Nbd7 5.e3 c6"] 1.d4 d5 2.c4 e6 3.Nc3 Nf6 4.Bg5 Nbd7 5.e3 c6 6.Nf3 Qa5 7.Qb3 Ne4 8.Bf4 Bb4 9.Rc1 Ndf6 10.Ne5 O-O 11.Bd3 h6 12.f3 Nd6 13.c5 Nf5 14.g4 g5 15.gxf5 gxf4 16.Rg1+ Kh8 17.Qc2 Qc7 18.Qf2 exf5 19.Qh4 Ng8 20.Rc2 Kh7 21.Qg4 f6 22.Nd7 Qxd7 23.Bxf5+ {#r} 1-0