These are your bread and butter. Each pattern follows directly from one of the three rules, and together they handle the majority of deductions you’ll make.
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Flip. When either side of a
×marker is known, the other side is the opposite symbol.Example:
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Mirror. When either side of an
=marker is known, the other side is the same symbol.Example:
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Sweep. On a 6×6 board each row and column contains exactly 3 suns and 3 moons. Once a row or column has all 3 of one symbol, every remaining empty cell gets the other.
Example:
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Bookends. Two consecutive identical symbols force the opposite into any empty cell directly adjacent to the pair.
Example:
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Sandwich. Two identical symbols with one empty cell between them force the opposite in the middle.
Example: