Solitaire Chess is a puzzle game by ThinkFun (of Rush Hour fame). On a 4*4 board, a number of chess pieces are laid. The aim is to capture all the pieces exept one. The player may only make moves that result in a direct capture. All pieces are the same color and can capture each other without restriction.
This version of Solitaire Chess includes 400 puzzles split into four difficulty levels, compared to only 60 for the physical toy it is based on.