(11C) Code guessing game

[Rogier]

I've had a chance to look at your program now Dieter. Works great. I didn't clock them, but I think it feels faster than my routine as well. The use of the exponent to show the number of guesses is a very nice touch. Never thought of that.
You solve the problem of the double scores by not permitting multiple identical digits in the code. I think I have come up with a way to make my program Mastermind-proof, while retaining the option to use identically coloured pegs in the code. If I get it running I'll post it.