There were two version of the Judge Game & Watch released. The second corrected a scoring glitch in the two player mode (Game B).
Explanation of the glitch:
In the 2 player mode, the Left player has an advantage. If the Left player makes a mistake and moves out of the way (even though having the higher number) the Right player gets 1 point, but if the Right player makes a mistake and moves out of the way (even though having the higher number) the Left player gets 2 points.