These offerings from John's notebook are an opportunity to make your own tasks.I was reminded of the Glaeser's dominoes when Kath Cross (another retired inspector) introduced the problem below at a recent ATM workshop in Leicester.

## CHESS BOARD PROBLEMSTake a chess board and a set of 32 dominoes, of matching size! It is relatively easy to see that the board can be completely covered by the dominoes. |

As a young teacher of mathematics I collected problems and kept them in what I called a commonplace book. I used this book as fill-ins: for kids who had finished, homework, starters, mains and the rest. It contained one of my all time favourite puzzles about dominoes but the book was lost. Many years later I found the puzzle on a poster at the then West London Institute of Higher Education. So the puzzle again found a place of honour in my inspector's notebook.

## GLAESER'S DOMINOESGeorge Glaeser of Strasbourg put a set of dominoes, more or less randomly in a flat tray and took a photograph. The exposure was not correct, and although the numbers could be discerned, the positions of the dominoes could not.3 6 2 0 0 4 4 6 5 5 1 5 2 3 6 1 1 5 0 6 3 2 2 2 0 0 1 0 2 1 1 4 3 5 5 4 3 6 4 4 2 2 4 5 0 5 3 3 4 1 6 3 0 1 6 6 |

John Hibbs

19 July 2005

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