Yinsh is a two-player abstract strategy board game that combines elements of Go and Tic-Tac-Toe. Players take turns placing and moving their pieces, which are circular and can be flipped to reveal a different color. The objective is to create a line of five pieces of your color, while also trying to block your opponent from doing the same. The game is played on a hexagonal board with a unique setup that allows for strategic depth. Each player starts with five pieces, and the game ends when one player successfully aligns five pieces in a row, either horizontally, vertically, or diagonally.