[FEN "r2qkbnr/1bpn1pp1/pp6/3p3p/3P1B2/2NBP2P/PP2NPP1/R2QK2R b KQkq"]

9... Be7 10. O-O


w b wb bw | w b wb bw

b     an



9...Be7      an



10. O-O      an