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Monthly Archives: March 2021
An ALS_XZ Wrap Up of UHC 311
This post shows what it means to maintain three three ALS maps. ALS map updates are followed through a series of ALS_XZ until a decisive coloring wrap on Stefan Heine’s ultrahardcore 311. We are exploring ALS mapping as ALS_XZ scans … Continue reading
Posted in Advanced Solving, Extreme Solving, Sudoku Toolware
Tagged ALS map updates, ALS_XZ scanning, ultrahardcore 311
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Continuing the Box ALS Scans for UHC 311
This post continues with the box to box, row and column scans for ALS_XZ. The C and S ALS fit into one red/orange cluster with a trap. The clusters meet in cell r7c8, showing that blue or orange or both … Continue reading
Posted in Heine, Puzzle Reviews, Sudoku Toolware
Tagged ALS box map, ALS map updates, ALS_XZ scanning
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Scanning the Column ALS and Some ALS Coloring
This post displays the column and box ALS maps, and scans for AIC the columns. The box scans are started, but get interrupted by an ALS coloring expansion. We start with the ALS column map on ultrahardcore 311 . It … Continue reading
Building ALS Maps With Suset Tables
This post displays the ALS map for rows of UHC 311, at the moment when the Beeby solver returned the first ALS_XZ. The suset ALS marking and building aid is introduced, and suset tables for rows, columns and boxes are … Continue reading
AIC Building Trial Follow Up for UHC 311
This post returns to AIC building after an encounter with a spontaneous ALS led to expanded coloring and a color trial. That will be normal under a plan of incremental ALS mapping. The confirmation of red had the follow up … Continue reading