A study in Flight Squares

1. e4 e5 2. Nf3 Nc6 3. c3 Nf6 4. d4 exd4 5. e5 Nd5 6. cxd4 {So far as in the Carlsen game. Now we got off on an RHP tangent.} 6... b6 {Probably not a good idea. Carlsen kept that b6 square free as a home for his d5 Knight.} 7. a3 {A wee snifter of a move. He is robbing that d5 Knight of flight squares.} 7... Bb7 8. Bc4 {Not liking the look of 8....Nde7 Black mixes it up.} 8... Na5 9. Ba2 {Now Black is worried about the coming b4 when the a5 Knight has to go back to c6 leaving the d5 Knight hanging. So...} 9... Bc6 {Resourceful play. He gives the a5 Knight a flight square on b7 and at the same holding the d5 Knight.} 10. b4 Nb7 {And guess what? The Bishop has no flight squares!} 11. b5 {11....Bxb5 12.Bxd5 and White has won a piece. Black resigned.}