Disclosed is the folding , the size is easily connected and fixed a cross-cut that is four divided so that one quarter , also to be divided up , in addition touch close to the conventional , while stones are lighter weight is and provides a convenient checkerboard set as the portable in a structure to secure and hammering . A and four by four split the checkerboard , Folded of the board that is the size of the squares of the half by connecting the two in the hinge 16 two sets making , of four sets of slide case -like structure that connects the two connect the two sets to slide the " joint plates " at medium and tethered " joint plate " a set panel of different two points against in the original hinge by fixing by a " joint plate " fasteners two center four split checkered , and the stones of the cross section of the useful cross-cut set as a portable , characterized in that it has the same shape and structure as the folding cross-cut ( squares , stones ) , the peripheral part , as a three sectional structure of the surface layer portion , having a high specific gravity , respectively , having a low specific gravity , and is used as satisfactory to touch - hitting sound as the material , lighter be the same as the conventional size , and features a structure comprising a stones which are friendly to the touch and hammering stones you have . [ Selection Figure ] Figure 2-1
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