Tag Archives: single chains

Andrew Stuart’s Guardians


Andrew Stuart is the well regarded author of The Logic of Sudoku, and a Sudoku programmer whose solver and website are valuable aids to puzzle makers and solvers alike. In  http://www.scanraid.com , also linked as http://www.sudokuwiki.org ,  Andrew had a page … Continue reading

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The X-Panel and X-Chains


We will now be leaving methods relying on the bv map as the primary visual aid. With puzzles that survive these methods,   we need to remember that the bv map file remains an important resource.  With every clue or candidate … Continue reading

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