Thread - HITORI

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	@ 2012-05-09 6:15 PM (#7225 - in reply to #4321) (#7225) Top
csraveen Posts: 4 Country : India	csraveen posted @ 2012-05-09 6:15 PM If a number appears only once in a row/column is it necessary to circle it?????and if a number appears more than once in a row/column is it necessary to circle one of them??????
	@ 2012-12-15 6:57 AM (#9129 - in reply to #4323) (#9129) Top
chaotic_iak Posts: 241 Country : Indonesia	chaotic_iak posted @ 2012-12-15 6:57 AM sanket - 2011-05-07 9:44 PM Also the rules of hitori say that a number cannot appear more than once. So can we use the reverse rule : Circling a particular number (or shading in yellow as in above case) if its another occurence in the same row/column has been shaded (in grey color as in above) because this ensures that the number will always occur once (and cannot appear 'zero' times) ? Not necessarily. Try this: 1112 2341 1213 2421 Observe C3. Both of its 1s are shaded, leaving no 1 remaining. To above: The first is yes if the solution is guaranteed to be unique (but no otherwise), the second is no.

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