Unbiasing of sequences
The following simpler adaptation of von Neumann's trick is more efficient than the one described in HdM's answer. Throw your die twice. If the two answers $x,y$ are different, write $0$ if $x&lt;y$ and $1$ if $x&gt;y$. This way, you get an unbiased bit source. If you are so inclined, you can use this bit source to simulate fair die throws.