Go Board Game 1/4 Board

This is my design of the 19x19 Go Chinese Board Game.
It is 1/4 of the full board, as such 4 of the board pieces will have to be printed. - the edge of the inside counts as a line - i halved the triangle grove so that the two side together again form a single grove (hope this makes sense).

I added 1cm blocks and holes on the sides, so it can snap together, thus the board can be glued into a single unit or stored as 4 pieces.

The board, excluding the 1cm snap, is 15cm x 15 cm, with the g