Tri-nim is a mathematical abstract strategy game developed by brothers Bruce L. Hicks and Hervey C. Hicks and published by WFF 'N PROOF Games from 1970 to 1975.
[1] Players move pieces around a triangular board, attempting to score points by being the last to enter each of the corners.
[1] Players take turns moving stacks of counters from the centre towards one of the three corners marked with a six.
Points are awarded for each corner depending on the number of pieces on the triangle and the order in which it was cleared.
The winner is the player with the most points by the time all counters have been moved into the triangle's corners.