The “pieces” are 3×3 patterns of stones. Move any 3×3 window that contains at least one of your stones and none of the opponent’s. Overlapping stones are captured. Lose your last ring and you lose the game.

Inventor: the Puzzles and Games Ring of the Archimedeans (Cambridge University Mathematical Society)

Published listing: BoardGameGeek: Gess.

No engine variants.

• Current engine version: 20240125 (2024-01-25). On Abstract Play since 2024-01-22.

• A display option hides the 3×3 highlight.

• https://boardgamegeek.com/boardgame/12862/gess