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Chess for kids.
Almost everyone of us have the memory of playing chess in childhood: the chess pieces were made of stones, papers or caps, while a chessboard was drawn on the ground. Fun and great experience!
Chess for poor kids.
Poor kids could collect the chess caps and play chess game with others. The cap is produced with a chess role slot. Overall the slot extends the life cycle of caps, and it reduces the waste for our lives.
Guanyun Wang Huilong Wang Jin Liu Chengyuan Wei Yijun Zhao Jiawei Zhang