Nine Dots Puzzle
The nine dots puzzle is a mathematical puzzle whose task is to connect nine squarely arranged points with a pen by four (or fewer) straight lines without lifting the pen or retracing any lines. The puzzle has appeared under various other names over the years. History In 1867, in the French chess journal ''Le Sphinx'', an intellectual precursor to the nine dots puzzle appeared credited to Sam Loyd. Loyd's puzzle asked for a sequence of 14 moves of a chess queen passing through all the squares of a chessboard and returning to the starting square; this can be considered as a "64 dots puzzle" of covering all dots of an 8-by-8 square lattice with a closed polygonal path whose segments are horizontal, vertical, or diagonal, and that turns only at the dots. In 1907, the nine dots puzzle itself appeared, in an interview with Sam Loyd in The Strand Magazine: : "[...] Suddenly a puzzle came into my mind and I sketched it for him. Here it is. [...] The problem is to draw straight lines ...
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