Sudoku is a number placement puzzle. The aim of the puzzle is to enter
a number from 1 through 9 in each cell of a grid, frequently a 9×9
grid made up of 3×3 subgrids (called "regions"), starting with various
numbers given in some cells (the "givens"). Each row, column and
region must only contain one instance of each number. Completing the
puzzle requires only patience and modest logical ability, although
some puzzles can be fiendishly difficult. Its classic grid layout is
reminiscent of other newspaper puzzles such as crosswords and chess.
Sudoku initially became immensely popular in Japan in 1986 and in the
UK, Israel, and Canada in 2005, stimulating international interest.
Read the rest of this article:
http://en.wikipedia.org/wiki/Sudoku
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Today's selected anniversaries:
1190:
Third Crusade: Frederick I Barbarossa drowned in a river in Anatolia
while leading an army to Jerusalem.
(
http://en.wikipedia.org/wiki/Frederick_I%2C_Holy_Roman_Emperor)
1829:
Oxford beat Cambridge in the first Boat Race.
(
http://en.wikipedia.org/wiki/Boat_Race)
1864:
Confederates defeated a much larger Union force at the Battle of
Brice's Crossroads.
(
http://en.wikipedia.org/wiki/Battle_of_Brice%27s_Crossroads)
1935:
Alcoholics Anonymous was founded in Akron, Ohio. This is the
traditional date of the first day of sobriety of the co-founder of AA,
Dr. Bob Smith.
(
http://en.wikipedia.org/wiki/Alcoholics_Anonymous)
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Wikiquote of the day:
"A novel is balanced between a few true impressions and the multitude
of false ones that make up most of what we call life. It tells us that
for every human being there is a diversity of existences, that the
single existence is itself an illusion in part, that these many
existences signify something, tend to something, fulfill something; it
promises us meaning, harmony and even justice." -- Saul Bellow
(
http://en.wikiquote.org/wiki/Saul_Bellow)