Go (game)
Two players, "Black" and "White", take turns placing a "stone" (game piece) of their own color on a vacant "point" (intersection) of the grid on a Go board. Black plays first. If there is a large difference in skill between the players, the weaker player typically uses Black and is allowed to place two or more stones on the board to compensate for the difference (see Go handicaps). The official grid comprises 19×19 lines, though the rules can be applied to any grid size. 13×13 and 9×9 boards are popular choices to teach beginners, or for playing quick games. Once placed, a stone may not be moved to a different point.
Indigo (board game)
The board takes the form of a hexagonal grid, with one tile present at the centre and six at the edge, with even intervals. The rest of the board is empty. On the centre tile are six jewels: one sapphire and five emeralds. The six tiles at the edge have one topaz each. The edges of the board between the tiles with topazes are marked with the players' colours. Depending on the number of players, a player can either have an edge all to his/her own, share an edge with another player, or both.