Dice Analyzer

I have some queries about the dice analyzer.
I will post one question at a time, and hopefully I get some rational explanations.
First question:
Ideal stats for 1v1 are 41.67% to win and 58.33% to lose.
I calculated different percentages, using very basic math so I assume I must be wrong.
Can someone explain how these ideal stats are worked out and if they are correct?
(I assume ideal stats are the same for everbody, if that's not the case then its buggy?)
I will post one question at a time, and hopefully I get some rational explanations.
First question:
Ideal stats for 1v1 are 41.67% to win and 58.33% to lose.
I calculated different percentages, using very basic math so I assume I must be wrong.
Can someone explain how these ideal stats are worked out and if they are correct?
(I assume ideal stats are the same for everbody, if that's not the case then its buggy?)