The MacCutcheon Variation is one of the sharpest and most exciting variations in the French. In this variation, the second player ignores White’s threat of e4-e5 and instead plays 4… Bb4. The mainline continues: 5. e5 h6 6. Bd2 Bxc3 7. bxc3 Ne4 8. Qg4. At this point, Black may play 8…g6, which weakens the kingside dark squares but keeps the option of castling queenside, or 8…Kf8.