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XY-Chain

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Part of a family: Chaining-Family

Simple Coloring
X-Chain
3D Medusa
XY-Chain
Alternation Inference Chain (AIC)

Difficulty

Hard

Description

The XY-Chain technique is the combination of 3D Medusa and X-Chain, meaning we

look for alternating weak and strong links, and
consider links between identical candidates within a region, as well as
different cell candidates within a single cell.

If you have not read about 3D Medusa and X-Chain, do it now. XY-Chain brings nothing new to the table.

XY chains, unlike AICs, exclusively consider bi-value cells, i.e. cells with only two candidates.

XY-Chain Examples

the chain

the candidates we can eliminate

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