The United States Chess Federation (USCF) states that the size of the squares must be 2 inches to 2.5 inches, while the height of the king must be 3.375 inches to 4.5 inches. The standard USCF tournament set has 2 squares of 25 inches and a king height of 3.75 inches.
Chess boardsare square and generally range in size from 16 to 20 inches (40.6 to 50.8 centimeters). Add additional space for the outer edge of the board. When it comes to playing chess, it's important to distinguish between the chess sets that a tournament player MUST wear to a tournament and those that the average citizen can play informally.
Most players don't need to play with the typical size of a tournament chessboard, as the standard chessboard size is suitable for the average player. However, tournament players are a little more restricted by the rules. The rules more or less dictate that the chessboard has 2 ¼ squares, and that the king of the set of chess pieces has between 3 ¾ and 4 ¼ inches in height. In fact, most tournament players use plastic chess pieces and roll-up vinyl chess boards or mouse pads, which are quite affordable. In the U. S., a standard chess board has a square size of between 2 and 2.5 inches.
So for a 2.5-inch square board, you could have chess pieces with a base of 1.5 to 1.87 inches. Or for the smaller square board of 2 inches, the chess pieces must have bases of 1.2 to 1.5 inches. There is an official tournament guide for placing chess pieces on a chessboard and vice versa. It states that the diameter of the king's base must not exceed 75% of the diameter of the squares of the chessboard. For example, a king with a base diameter of 1.5 inches must have a square diameter of 2 inches. To ensure an enjoyable playing experience, it's important to choose a chessboard that is not too small for your pieces.
The perfect size for a chessboard is 20 x 20 inches, with a square size of 2.25 inches x 2.25 inches that provides ample space for a good set of chess players to sit comfortably in the individual squares based on a king 3.75 inch high and 1.5 inch diameter base. You can find out the size of the chessboard you need by measuring your chess pieces and measuring the squares on the chessboard. Since most chess boards are square, at least the playing area should be; if not the entire piece, then its length or width will be equal, and its size should be between 17 and 21 square inches. The official recommendation of the chess body for the standard size of a chessboard is that each of its 64 squares should measure between 2 and 2.5 inches. It states that the diameter of the king's base must not exceed 75% of the size of a square on the chessboard. It is generally accepted that an ideal-sized chessboard has a square size of 2 inches and measures about 17 to 21 inches wide, allowing good space for pieces to fit on it and move freely during play.