$stone_height = 3;
$stone_radius = 9;
$stone_clearance = 0.5;
$mark_thickness = 1.5;
$hoshi_radius = 4;
$goban_hole_radius = 2;
$goban_hole_height = 2;
$goban_height = 3;
$line_depth = 1;
$cell_width = 20;
$cell_length = 20;
$goban_padding = 12;
$line_width = 1;
$goban_size = 9;
$hoshi_pos = [3, 7];
// [4, 10, 16] for 19x19, [4, 7, 10] for 13x13, [3, 7] for 9x9