Questions tagged [cows-and-bulls]

Cows and Bulls is an old code-breaking mind or paper and pencil game for two or more players, predating the commercially marketed board game Mastermind.

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Why is it important that the digits be all different?

In standard Bulls and Cows, the digits of the chosen number must be all different. Is this rule crucial for the "playability" of the game? In other words: if I ignore this rule and allow choosing a ...
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Cows and bulls to allow duplicates

So as all of you know, Cows and Bulls is a pen and paper adaptation of the popular board game Mastermind. I would like to design a game that would allow duplicate numbers for the code and assign ...