Computer4-IMPOSSIBLE Capable of Kindness?

Hello, and thanks to all who will take the time to answer this post.

First off, let me say that I am not including this game to brag. I played absolutely abysmally.

I'm just curious about the computer's behavior: That 26. d6 that enabled me to perpetually check the computer and to (somehow) get a draw by threefold repitition. What could possibly explain it. A bug? A quota for the # of draws it must make each day? An attempt to even up the position? 

Does Computer4-IMPOSSIBLE have the milk of human kindness, by the quart, in every chip?

Come to think of it, I probably could have gone for the win after that, but I was just too scared. (:

Sorry about the rambling nature of the question. I appreciate any and all answers. 

S

Sometimes the engine screws up. I saw a game where the computer4 missed a mate in 1.  It's not incredibly powerful.