Realm

Realm is a 1973 game by Phil Orbanes Sr, and published in Gamut of Games and at nestorgames. 

It is played on a 12x12 board, where each army has 14 squares (the bases), nine triangles (the enforcers), and four circles (the powers). This is a game of capturing based on blocking pieces.

The rules are quite complex for an abstract game, and I will not write them here. Please check the rules written by nestorgames (which includes several variations).

The game was reviewed and explained in Abstract Games Magazine #9, and is playable at AbstractPlay.

Also, here's an older review from GAMES #47: