Hidden Quad

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.

Hidden Quad, How to solve sudoku puzzles - Solving sudoku strategy,picture 1

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