Chess queen trap French defence, Fort Knox plus lesson, themes, tactics!

This video explains the basics of, and a trapping line in, the French Rubinstein (1. e4 e6 2. d4 d5 3. Nc3 dxe4 4. Nxe4) Fort Knox variation, where Black plays 5. …Bd7 intending Bc6. The Queen trap occurs if Black plays carelessly, without regard for with Nf6 before Nd7 and/or Be7.