Wood Expressions The Original 100% Silicone Tournament Chess Mat - 20 Inch Board, Green - by WE Games Roll-Up Silicone Tournament Chessboard Made of 100% Silicone - Green & Buff Color Board Includes Algebraic Notations in Green Board Measures 20 x 20 Inches with 2.25 inch Squares Silicone Performance Play Board - Non Slip Surface