This game is game #27 in the Games on Half a Checkerboard Series. Sight Reduction challenges players to remove their own pieces that can trace a line of sight to another one of their own pieces. When players remove certain pieces is critical, as there is a timing element which can result in a player winning or losing a game, based on when they remove pieces. In the normal version of the game, the board is set up randomly. There is also a variant rules for more deterministic play. The game also also includes a solitaire variant, which is very similar to the regular 2 player version.