Difference between revisions of "Hidden Quad"
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Latest revision as of 03:29, 4 June 2020
A Hidden Quad is a Hidden Subset of size 4.
When all candidates for 4 digits in a house are limited to only 4 cells, these cells must contain these 4 digits. Subsequently, all remaining candidates can be removed from these 4 cells.
Example
The following example shows a Hidden Quad in the 6th box.
