Who is the strongest among these chess engines? Fritz 10, Comet B68, Crafty 20.14w32 or Fritz 5.32?

Question

Who is the strongest among these chess engines? Fritz 10, Comet B68, Crafty 20.14w32 or Fritz 5.32?

Answer 1

Of those engines Fritz 10 by quite some margin.

The strongest engine of all at the moment though is Rybka which was able to beat a grandmaster (Joel Benjamin) even when giving a pawn handicap

Answer 2

Fritz 10

Answer 3

Fritz 10 is the strongest among the chess engines you list.  The Swedish Chess Federation routinely runs tournaments among the top chess engines to determine their playing strengths.  Check the most recent rating list at the link below.