The chessboard is one of the
Thirteen Hallows of Britain...
http://www.pharo.com/history/templars/articles/mhte_18b_freemason.asp
For example, the mosaic of black and white squares, like a chessboard, of the floor of the Masonic lodge recalls the Templar battle flag, the Beauseant.
http://www.vermeersriddlerevealed.com/
the thirteen hallows
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