# Tag Archives: coloring bridge

## Ultrahardcore 91 Trials Unleash Beeby

Here is the basics launch on Stefan Heine’s ultrahardcore 91, which quickly runs my two assisting solvers out of humanly practical removals. A Single Alternate Sue de Coq  trial reduces two clusters two one, and produces  two critical clues. In … Continue reading

## Wrapping Up Nakamoto Extreme With 183

This post completes the review of the Nakamoto Extreme collection. The review table follows the finish of Nakex 183. A Sudokuwiki assisted solution of Nakex 183 continues with the second APE triggered by the first’s removal of 8r2c9. In this one, … Continue reading

## Nakamoto 143 Avoids Extremes

Nakex 143, the eighth puzzle in the review, avoids AIC building with an outstanding exhibition of advanced techniques, and three subsets in basic line marking, including this naked triple. Two more show up in LM closing, the stage that examines … Continue reading

## Nakamoto Extreme 3 Exits in Full Color

This post continues the Sysudoku report and supplemented Sudokuwiki solution of Nakex 3. We pick up from last week with matching  8 pairs in E and SE. The starting slink has been available since Sudokwiki entered AIC building, but new … Continue reading

## 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

## Berthier’s xyzt Chain

This post concludes my reading of Denis Berthier’s The Hidden Logic of Sudoku, with two example puzzles to illustrate his xyzt-chain. While it is good to be aware of Berthier’s “t” versions of classic XY chains, I don’t recommend a comprehensive … Continue reading

## Box Marking of Maestro 4

This is an extra post for any sysudokies working up Maestro 4 for color bridging. After 1: NWm=>Wm, Sm.  2: Cm. 3:NWm=>Wm, Sm.  4: NEm=>Em.  5: SW5=>Sm. 6: Nm=>Cm, SWm.   7:  Nc5np67.  8:  9: NE9=>(SEm, NE4=>(NW4m, NE5m=>E5m), NE2m), Cm. the grid … Continue reading