Ruy López Opening: Morphy Defense, Anti-Marshall Variation

1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.O-O Be7 6.Re1 b5 7.Bb3 O-O 8.a4 b4 9.d3 d6 10.Nbd2 Na5 11.Ba2 c5