The MacCutcheon Variation of the Classical French Defense (C12). Also known as the McCutcheon Variation.Encyclopedia of Chess Openings Nomenclature:
C12(a) French: MacCutcheon Variation
1.e4 e6 2.d4 d5 3.Nc3 Nf6 4.Bg5 Bb4
C12b French: MacCutcheon, Wolf Gambit: 5.Nge2
C12c French: MacCutcheon (minor 5.Bd3 line): 5.Bd3
C12d French: MacCutcheon, Exchange Variation (non-Bogoljubov): 5.exd5
C12e French: MacCutcheon, Bogoljubov Variation: 5.exd5 Qxd5 [6.Bxf6 gxf6 7.Qd2 Qa5]
C12f French: MacCutcheon, Advance Variation (non-5. ...h6 lines): 5.e5
C12g French: MacCutcheon, Advance Variation (minor 5. ...h6 lines): 5.e5 h6
C12h French: MacCutcheon, Chigorin Variation: 5.e5 h6 6.exf6
C12i French: MacCutcheon, Grigoriev Variation: 5.e5 h6 6.exf6 hxg5 7.fxg7 Rg8 8.h4 gxh4 9.Qg4
C12j French: MacCutcheon, Bernstein Variation: 5.e5 h6 6.Bh4
C12k French: MacCutcheon, Janowski Variation: 5.e5 h6 6.Be3
C12l French: MacCutcheon, Olland Variation: 5.e5 h6 6.Bc1
C12m French: MacCutcheon, Tartakower Variation: 5.e5 h6 6.Bd2 Nfd7
C12n French: MacCutcheon, Lasker Variation: 5.e5 h6 6.Bd2 Bxc3
C12o French: MacCutcheon, Duras Variation: 5.e5 h6 6.Bd2 Bxc3 7.bxc3 Ne4 8.Qg4 Kf8 9.Bc1