Hexagrams

Hexagrams is a 1988 game by Marv Nelson which self-published it.

The game is played on a tiling of hexagons and triangles. Each player has 16 tall pieces (the Triads) and five flat disks (the Hexads) starting in the following setup:

Rules:

• A player must do one of the following actions, in decreasing priority:
• using a hexad to capture an adjacent enemy hexad, this is possible only if the two triangles between them are empty; capturing hexads is optional
• using a triad to capture an adjacent enemy triad; capturing triads is mandatory
• move one friendly piece, hexad or triad, to an adjacent empty cell (hexads can only move when the two adjacent triangles are empty)
• triads can only move forward
  
• a triad can be moved out of the board, at the player's last row
  
• Wins the player that either captures all enemy hexads, or by stalemating the adversary