What is wrong with the following position?
[FEN "r1bq1rk1/pp1nbppp/2p1pn2/3p4/2PP4/2N1PN2/PPQ2PPP/R1B1KB1R w KQ - 0 9"]
Hint: Consider the last move, then count the moves made by both players. To play through the complete game see...
Alexander Alekhine vs Karoly Sterk, Budapest 1921