Tag Archives: pattern enumeration

Packing for the Golden Nugget Exocet Assault


This post completes exocet removal testing, finding an unexpected consistency over the solution combinations.  These results are so telling, that we prepare for a sysudoku assault of the Golden Nugget. We bring up a partnering brigade of 30 2-patterns, in … Continue reading

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Unsolvable 40 Logically Solved


In this post we checkpoint the solution of Stuart’s Unsolvable 40, via LPO and a coloring cluster extended by pattern slinks.  The solution of this puzzle by pattern analysis expresses well the ideals of Systematic Sudoku, and demonstrates what can … Continue reading

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LPO vs Unsolvable 40


This post applies Limited Pattern Overlay, the sysudokie’s POM, to an Andrew Stuart Unsolvable, #40. The interplay of coloring and LPO patterns ties this beast up for the kill. Here is the grid as we apply LPO: My freeform LPO … Continue reading

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Advancing to LPO on Unsolvable 40


This post confirms the intractability of Andrew Stuart “Unsolvable #40” to SSOB  bv scan, X-panel analysis, coloring.  In preparation for Limited Pattern Overlay, a shortcut AIC reduces the number of patterns  for the number 8, and a coloring cluster is … 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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