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Oriented Chains

Oriented chains are generalisations of the basic xy-chains.

The central idea is that the information collected from previous candidates in a chain (and/or from the target) can be used to select the next candidates. Oriented chains are either 2D or 3D:

- oriented 2D chains: xyt-chains, xyz-chains and xyzt-chains, together with their "hidden" counterparts: hxyt-chains, hxyz-chains and hxyzt-chains;

- oriented 3D chains: nrct-chains, nrcz-chains, nrczt-chains.

(The original reference to all these chains is the book "The Hidden Logic of Sudoku". Further web references forthcoming)

This page was last modified 12:30, 27 April 2008.  

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