London: 3.Bb4+

1.d4 Nf6 2.Nf3 e6 3.Bf4 Bb4+ 4.c3 Be7 5.Nbd2 d5 6.e3 O-O 7.Bd3 Nbd7 8.Qc2 a6 9.Ne5 Nxe5 10.dxe5 Ng4 11.Bxh7+ Kh8 12.Bd3 Bd7 13.O-O-O Nxf2 14.Rhf1 Nxd1 15.Qxd1 Kg8 16.Qh5 g6 17.Bxg6 fxg6 18.Qxg6+ Kh8 19.Rf3 Rxf4 20.exf4 Bh4 21.Rh3 c5 22.Nf3 Be8 23.Qg4 Bg6 24.Qxg6 d4 25.Ng5 Qxg5 26.Qxg5 dxc3 27.Rxh4#