411 REFERENCE · Wikibooks
Chess Opening Theory/1. e4/1...e5/2. Nf3/2...Nc6/3. Bb5/3...a6/4. Ba4/4...Nf6/5. O-O/5...Be7/6. Re1/6...b5/7. Bb3/7...O-O/8. c3/8...d5/9. exd5/9...Nxd5/10. Nxe5/10...Nxe5/11. Rxe5/11...c6/12. d4
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tright Marshall Gambit rd bd qd rd kd bd pd pd pd pd pd pd nd rl pl bl pl pl pl pl pl pl rl nl bl ql kl Common moves: 12...Bd6 - only move
12...Bd6 is the universal response to 12. d4. Black's e7-bishop is hitting thin air on g5 and h4, so it relocates with gain of tempo to hit the much more exciting h2 square.Marshall Gambit