![]() Assuming the 5 is correct and following the blue chain shows that the square at row one/column six must also be a 5. In Puzzle 18, the shaded square in row nine/column one can contain either a 3 or 5. This solving technique allows you to eliminate candidates identified by following a chain of “buddy” squares which each contain only two candidates. Because the same candidate cannot appear twice in the same row, all the orange squares in the chain must not contain the candidate 3 and all the blue squares will hold the number 3.įorcing Chains are also known as a “Double-Implementation Chains.” It occurs when a square with only two candidates determines (or forces) the content of another square, regardless of which candidate in the first square is selected. Then the candidate 3 in row six/column seven would be orange.Ĭoloring this chain reveals two orange squares in row six. One end of the coloring chain stops at row six/column two, because there is more than one other square in its row and block with a 3.Īt the other end of the chain, if the square at row one/column eight is orange, then the other square in that block containing a candidate 3 (row three/column seven) must be the opposite and we can color it blue. Whether that square does or doesn’t contain a 3, the squares at row six/column two and row one/column eight will be the opposite. Alternating colors when one or the other candidate must be correct helps you spot inconsistencies that will allow you to remove candidates.Īs an example, in Puzzle 17 we can color the chain of number 3 candidates starting in row one/column two.
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