EX9124 shows a 9 square by 9 square grid. Take each tile to be 3 squares by 3 squares; there is a 3 tile by 3 tile checkerboard pattern. (One of these tiles is itself a checkerboard pattern; the other is all black squares.)

EX9124 shows a 9 square by 9 square grid. Take each tile to be 3 squares by 3 squares; there is a 3 tile by 3 tile checkerboard pattern. One of these tile is itself a checkerboard pattern; the other is all black squares.

In EX9124 the 9 by 9 square grid forms a 3 by 3 tile checkerboard pattern (with each tile of the checkerboard a 3 by 3 grid of squares). One of these tile is itself a checkerboard pattern; the other is all black squares.

Can be cut into tiles forming a checkerboard pattern vs. not so.

All examples in this Problem are grids consisting of two objects.

In EX9124 there is a checkerboard pattern with each unit of the checkboard as a 3x3 grid of 3x3 grids of squares. One unit is a checkerboard pattern, the other is simply all black squares.

"Generalised" Checkerboard Pattern vs not

All examples in this Problem are grids consisting of two objects.

In this Problem, "generalised" checkerboard pattern means that the grids form a checkerboard pattern when some size grouping of grid squares (not just single grid squares) are taken to be the "units" of the checkerboard pattern.

In EX??? there is a checkerboard pattern with each unit of the checkboard as a 3x3 grid of 3x3 grids of squares. One unit is a checkerboard pattern, the other is simply all black squares.

Jago Collins