A LOT IN COM­MON

Pasatiempo - - RAMDOM ACTS -

The cor­re­la­tion be­tween cer­tain types of puzzles and, say, forms of po­etry is fairly straight­for­ward. Here we have the con­straints im­posed by Su­doku puzzles and Villanelle po­ems.

As Peter Turchi ex­plains:

SU­DOKU

It must be a nine-by-nine inch grid. The grid must be fur­ther di­vided into nine three-by-three squares. Each square in the grid must be filled with the num­bers 1-9. No num­ber may be re­peated in any hor­i­zon­tal line.

No num­ber may be re­peated in any ver­ti­cal line. No num­ber may be re­peated in any three-by-three square. The puz­zle com­poser omits cer­tain num­bers, and those omis­sions

al­low for one unique so­lu­tion.

VILLANELLE

It must have nine­teen lines. The nine­teen lines must be fur­ther di­vided into six stan­zas. The first five stan­zas must be ter­cets. The fi­nal stanza must be a qua­train. The poem must have two re­frains. The poem must have two re­peat­ing rhymes. The re­peat­ing rhymes must be in the first and fi­nal lines of the first ter­cet. The rhymes must re­peat al­ter­nately in ter­cets two through five. The qua­train must in­clude both re­peated lines and both rhymes.

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