Tag Archives: coloring trial

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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