In the above position after 1. e4, e5 2. Nf3, d6 3. d4, Bg4 4. dxe5, Bxf3 5. Qxf3, dxe5 6. Bc4!, Nf6 7. Qb3, Qe7 Paul Morphy played a move most computers fail to appreciate:

8. Nc3!

Development! Morphy was the first player to truly understand the value of development.

The game continued famously in Morphy-Duke of Brunswick with Count Isourd, Paris, 1858:

8...c6

9. Bg5, b5

Some computers actually want to play 9...b5?! It is hard to find good alternatives. After 9....h6; 10. Bxf6!, gxf6; [10...Qxf6??; 11. Qxb7 and white is clearly better, and after ...gxf6; Black majorly lags in development and has a HORRIBLE Pawn structure. or 9...Qc7; 10. a4, Bc5; 11. Rd1!, 0-0; 12. Bxf6, gxf6; 13. 0-0 with clear advantage to white

And now came:

10. Nxb5!!, cxb5

11. Bxb5+, Nbd7

12. 0-0-0, Rd8

13. Rxd7!, Rxd7

14. Rd1, Qe6

15. Bxd7+!, Nxd7

16. Qb8+, Nxb8

17. Rd8#.