Tag Archives: coloring trial

Lite Coloring Informs a UHC 399 Trial


In one post, the 10th ultrahardcore review puzzle is wrapped, but not without an introduction of something new in Systematic Sudoku. Ordinarily advanced steps begin in line marking, and lite coloring is introduced. In line marking Stefan Heine’s ultrahardcore 399, … Continue reading

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A Coloring Trial Weakens ultrahardcore 311


Sorry about last week’s post arriving a week earlly. This week continues the solving of Stefan Heine’s ultrahardcore 311 with a coloring trial, and an enabled Beeby marching to the solution. Here is the trial grid, after the removal of … Continue reading

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Readers Solve Ultrahardcore 3


This post returns to the Stefan Heine’s utrahardcore  3 solution path just before cell and unit forcing chains. It turns out that an immediate coloring trial reaches a solution without them. Then we report how two Sysudoku readers solve it … Continue reading

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Moito’s Road to Sudoku Mastery


My first Sysudoku review of 2018 is one of a host of new collection books with the same grid format, some with an unexplained rating system, some with listed authors A.D. Ardson and Rebecca Bean. Moito and Bean’s  Extremely Hard … Continue reading

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Dragging in Only Extreme 304


This post continues with three more trials, two to reach a solution, and one to guard against multiple solutions, in Castillo’s Only Extreme 304. This is getting reeeaallly extreme. Last week, we managed to extend and XY-chain across the grid … Continue reading

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HM Easter Monster Solved


This post finishes the HM Easter Monster with Sue de Coq, X-chain ANL, coloring trials, and a remote pair. It ends with a summary of the Hanson and Marans review In the last post, trials of blue and green wrapped … Continue reading

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