Example puzzle

This is an example puzzle. You can solve it the same way as you would solve competition puzzle, but result never stored. You can reveal an answer for the puzzle by clicking "Show answer" link.

Battenberg Painting

Author: Andrey Bogdanov

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Shade some cells in the grid. Numbers outside show the number of cells shaded in the corresponding row or column. All nodes where shaded cells form the chess pattern are shown.

Example puzzle

Grid control: Click the mouse button at the selected cell to change the filling of the cell. More details about grid control are at the help page.