Have you heard this?

Before a major tournment some GMs arrived at a hotel.  A man came to Capablanca's room and said, "I have solved chess!"  So Capablanca played against him, and after a queer combination, the man won in twelve moves.  Capablanca played again, this time with a different opening and again he lost in twelve moves!!  He called in Alekhine to play the man, and he too lost in twelve moves.  Other GMs were called in and in turn all lost, again in twelve moves. 

"It was terrible and embarrassing," Capablanca told a friend.  "Whatever we did, we always lost in twelve moves.  It is all over, chess has been solved." 

"But I never heard that chess was solved.  What happened?" his friend asked. 

"Why we killed him, of course!"

Good one!