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W Wing

Hard

A W-Wing can be found when two cells are connected by a bridging .

How it works

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Start with a Remote Pair

These two cells have the same two candidates (2 and 7) and don't each other.

Note

The cells must not see each other.

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Find the bridging Box

In this Box, every cell with candidate 7 intersects with the .

Note

Every cell with 7 must see one end of the Remote Pair. Otherwise the pattern doesn't work.

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They can't both be 7

If both Remote Pair cells are 7, then this Box would be invalid.

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One or both must be 2

We can be certain that one or both of the Remote Pair cells must be 2.

Note

We can't be sure that either cell is 7, only that they cannot both be 7.

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Eliminate shared peers

Safely remove 2 from any cells that see both of the Remote Pair cells.

All Hints

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