The ornamental design for a double-sided chess board, as shown and described.
The file of this patent contains at least one drawing/photograph executed in color. Copies of this patent with color drawing(s)/photograph(s) will be provided by the Office upon request and payment of the necessary fee.
FIG. 1 is a plan view of a double-sided chess board.
FIG. 2 is a top view thereof.
FIG. 3 is a bottom view thereof.
FIG. 4 is a top, partially folded view thereof.
FIG. 5 is a plan view of another embodiment of the double-sided chess board.
FIG. 6 is a top view thereof.
FIG. 7 is a bottom view thereof; and,
FIG. 8 is a top, partially folded view thereof.
The claimed design comprises a double-sided chess board made from a flexible material, where one side of the board features a black chess board and the other side features either a different color (as in FIGS. 5-8) or a tournament-approved green color (as in FIGS. 1-4).