The following game can be found in "Mastering the Chess Openings: Volume 1" by John Watson and is used to illustrate the advantage of development in the opening. There is an almost identical game given in "My System" by Aron Nimzowitsch, again addressing the need for development in the opening. The only difference in the moves played was that Nimzowitsch's opponent (only given as Amateur) played 9. ... cxd6 and the game continued 10.exd6 Nxf2 11.Qb3 Nxh1 12.Bxf7+ Kf8 13.Bg5 where the moves were once again in sync.
Now here is the riddle. Both players with the Black pieces resigned at the same point, yet while Libov's resignation was sensible, Nimzowitch's opponent should have played on. Why?
Estrin,Y - Libov [C54]
1.e4 e5 2.Nf3 Nc6 3.Bc4 Bc5 4.c3 Nf6 5.d4 exd4 6.cxd4 Bb6 7.d5 Ne7 8.e5 Ne4 9.d6 Nxf2 10.Qb3 Nxh1 11.Bxf7+ Kf8 12.Bg5 cxd6 13.exd6 1-0