A discovered check by King 
 The 1k was blocking the check with the queen. I killed the queen with my King and kept slaughtering on.
 

 
 The final checkmate was this:
 
  
 
 Chess Sensation in Berlin
 
 The 1k Javascript chess program could not handle his cruel gambit play with rooks.
 
 
 
 try yourself at http://js1k.com/2010-first/demo/750
 
 
 
 Chess Game
 
 Chess Game