Checkers 3 (1975)

"Checkers played with 2 or 3 players on a six-sided hex board, with 61 black hexagons touching only at their points, not their sides, leaving small red spaces between, and forming a larger overall hexagon. Each player picks a side separate from other players. Complexity comes not as much from the board itself but from the addition of an extra player's pieces. Other 3 player Checkers variants have instead stretched a Checkers board's squares into a "Y" or triangular shape. The publisher's name suggests there may have been a Chess variant published with a similarly styled board. "