Bizarre Analysis
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Understand how the computer rates moves. The two categories that this position was rated on were position and material. Through Fritz's eyes, Rxc6 was better because it takes the pawn and delivers mate, thus improving your position, and taking another point in material.
It happens to me sometime , I can recall several instances where the computer identified 3 mates and awarded one with a !? (interesting move ) one with ?! (dubious move ) and one with no annottion . I think it is because of the reason Unbeliever described :)
Ultimately it is the man behind the machine - one must realise that the writer of the program has 'taught' the computer to react the way it does.
Sometimes I don't understand computer programs. I had Fritz 8 analyze a game I played OTB with a friend which had this penultimate position:
From here there are two (that I can see) mates, so I played the one that was obvious to me at the time, Rf4#. Much to my surprise, Fritz's Blunder Check notated that move as "28.Rf4#?= [0.00 Fritz 8: 28.Rxc6# #1/2 ] 1–0". In other (or, I suppose, actual) words, "Rf4 mate, questionable move, postion equal, white wins, was mate in 1 before this blunder, you should have played Rxc6#, you bonehead". Um... er... First, I've never seen a mate called a blunder. Second, in what way has the position become a draw? [boggle]
So, anyone have any insight here, or should I just chalk it up to ghosts in the machine? :)