From the Super Mario Wiki
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1-vs-3 spaces appear in Mario Party 9, where they still trigger 1-vs-3 minigames. However, they are now found on every board instead of certain solo boards, and they have been renamed to 1-vs-Rivals Spaces. When playing with less then four players, they are 1-vs-2 Spaces, but still serve the same effect.
If only two players are playing, no 1-vs-Rivals Spaces will be present.
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