![]() ![]() Update October 2015 : My old definition of Rule 1 only made a negative assertion about the yellow candidates - they can be removed. Rule 1 is: If two candidates in a cell have the same colour - all of that colour can be removed - and the opposite colour are all solutions ![]() This is a contradiction and therefore we can state that no yellow numbers can be the solution! Since we know that if yellow candidates have the potential to be ALL true we can't have a situation where two yellow numbers are competing for the same cell. When you have built up a web of connections, alternating between two colours you might find a cell with the same colour set twice. ![]()
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