Yin-Yang (2014)

Yin-Yang is a brief abstrat game for two players, each player takes both of the white and the black stones for playing. They take turns placing stones on the 5x5 game board, for the purpose of making a square by four stones in the same color.
In the game, each player belongs to Yin or Yang side. So does the square been made on the board. The player who’s Yin-Yang is the same as the square wins the game.

On which the Yin-Yang of a square depends:
White stone is Yang;
Black stone is Yin;
Odd number of lines of gribs the square covered is Yang;
Even number of lines of gribs the square covered is Yin;

Combining Yin-Yang of the stones with the size of the square just as multiplication rules of plus and minus, the result is the Yin-Yang of the square:
White stone x Odd number = Yang
White stone x Even number = Yin
Black stone x Odd number = Yin
Black stone x Even number =Yang