Tag Archives: 4-fills

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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