Monthly Archives: August 2012

Coloring LPO


We follow up the LPO attack on Maestro 22 in this post to illustrate how coloring enhances LPO pattern enumeration. The clues from pattern 7a  yield N8=>NEhs8=>NEr3np46=> NWr3np89=>Nr3np69, and E9m=>SE9m.  The 5 patterns yield a 5-clue in E. The 2-panel … Continue reading

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A Limited Pattern Overlay on Maestro 22


This post details the LPO enumeration and pattern overlay on Maestro 22. To sysudokies working on this over the last posts, the slinks between  7 –candidates suggests coloring.  Every 7-candidate belongs to the cluster.  With no XY-chain, SdC , APE … Continue reading

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Pattern Enumeration for POM and LPO


Pattern overlay methods, both the computer based POM and the human engineered LPO, depend on finding every pattern for each participating number.  Andrew Stuart’s The Logic of Sudoku,   Chapter 32, gives examples of enumerated patterns which demonstrate that candidates can be … Continue reading

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LPO, a Limited Form of POM


The Pattern Overlay Method, or POM is frequently cited as a computer solving method, but seldom proposed as a human solving technique, and for good reason. A pattern is a subset of X-candidates that fit together to provide an X-clue … Continue reading

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