The ninth game is the child's game of Dots and Boxes, a surprisingly deep
game mathematically. A recent rebirth of interest in this game has been
prompted by the publication of Elwyn Berlekamp's book,
"The Dots and Boxes Game -- Sophisticated Child's Play" (2000), A.K. Peters, Ltd.
The last game is a one-person game (puzzle) of deducing where the dominoes are
in a rectangular array.