Reversi

Reversi is a two-player abstract strategy game played on a grid board with double-sided discs. Players take turns placing discs to flank and flip their opponent’s pieces. The player with the most discs when no legal moves remain wins.

Invented by Lewis Waterman and John Mollett in England around 1883. Public domain. World Reversi Championships have been held annually since 1977.

Variants

Standard — The original 8×8 game as played in international competition
6×6 — Smaller board for quicker games; same rules throughout
Anti-Reversi — Misère: the player with the fewest discs wins

Attribution

Reversi. Invented in 1883, with the claim disputed between Lewis Waterman and John W. Mollett. Documented at en.wikipedia.org and mastersofgames.com. Public domain. Note that Othello is a separate, trademarked 1971 game; the files here describe Reversi.