Tag Archives: 4-fills

Three Ways to Bypass an ABJ CREATORS


The second Akron Beacon Journal CREATORS of 3/15/22 Sudoku turned out to be a good one for comparing Sysudoku bypass solving without 3,4-fills, with 3-fills only, and with every resolvable 4-fill. Scroll back to see the givens grid above. My … Continue reading

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A Hidden Triple From Hidden Logic


Hidden pairs are rare, but hidden subsets of n > 2 are rarer still. This updated solution of Royle 17-13727, a puzzle from a large collection of puzzles of 17 givens, was an example in The Hidden Logic of Sudoku … Continue reading

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Doing Every 4-Fill


In the Dave Green 5-star of 1/23/22, four 4-fills are available before starting the bypass values list, on r2, r8, c2, and c8. It brings up the possibility that 4-fills can solve this Conceptis puzzle by themselves? We normally put … Continue reading

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All the Way With Dave


This post goes through Sysudoku Basic with the Dave Green puzzle published in the Akron Beacon Journal on Sunday October 10, 2021. It’s the first in a series of published Conceptis puzzles selected to illustrate basic moves introduced in the … Continue reading

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Coloring KDST 5 10 5 is Too Easy


The bypass almost finishes KrazyDad Super-Tough v.5, b.10, #5, whether or not you start with the 4-fill and two 3-fills. Here’s my 4-fill version. Line marking is minimal, and coloring on the few candidates remaining wraps green in r6. With … Continue reading

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Two Dave Green 4-fills


This post reports Sysudoku Basic on the two Dave Green puzzles of the previous post. In the Sunday 5-star of 4/17/21 on the left, a 5-fill becomes a 4-fill when N6 drops in. It is immediately  resolved to a 3-fill … Continue reading

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A Lite Update on Castillo’s Only Extreme 347


This post updates a solution by coloring trial in the review post of 12/19/17. A bypass of 6 4-fills resolves 3 of them immediately,  but goes no further than the original 3-fill only bypass.  Then we follow Beeby through a … Continue reading

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