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Three cells in one house whose candidates, combined, add up to only three digits total - even if no single cell lists all three. Those digits can be crossed off everywhere else in the house.
Naked Pair's three-cell version: three cells whose candidate union is exactly three digits, each cell holding two or three of them.
Find three cells in a house where, combined, they only ever mention three distinct digits between them.
Those three digits must fill exactly those three cells - there's no room left for any of them elsewhere in the house.
R3C1 has {1,4}, R3C5 has {1,6}, and R3C9 has {4,6} - only 1, 4, and 6 appear across all three. Eliminate 1, 4, and 6 from every other cell in row 3.
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