Yellow Mountain Imports Go Game Set with Reversible (13x13 | 9x9) Shin Kaya Go Board (0.8-Inch Thick) and Single Convex Stones Reversible; playing field is reversible, 13x13 on one side and 9x9 on the other; in a standard 19x19 board, the possible combinations of Go positions are infinite, and a game can last for hours; the smaller playing fields of this board keep your skills sharp by allowing you to play shorter, more frequent games when you don't have time for a full-length one; even if you already have a standard 19x19 goban, you will appreciate the informality and convenience of these smaller playing fields Supreme shin kaya wood; this is a 0.8 of an inch (2 centimeters) thick shin kaya solid wood table board (goban); please note, because of the nature of wood, the grain will be similar but not identical to the images you see in this product listing; playing Go on a quality wood table board connects one with the hundreds of generations of Go players who have played on shin kaya since ancient times Japanese standard size; this board is Japanese standard size meaning the grids are 21.5 x 23 millimeters; the board's dimensions are 14 x 13 x 0.8 inches (35.5 x 33 x 2 centimeters) Stones and bowls; 181 black and 180 white melamine stones are included; each stone is a 21.5 - 22 millimeter (size 3) single convex stone measuring about 5.6 millimeter tall and 21.5 to 22 millimeters wide (approximately 0.22 x 0.87 inches); 2 plastic bowls (gosu) to store stones are included; a booklet explaining the essential rules and strategies of Go is also included with this set 30-day return policy; here, at Yellow Mountain Imports, we want you to be satisfied with your purchase; you are backed by our 30-day no questions asked money back guarantee so you can buy with confidence