Classic 48 Gets to the Crayons

The second Classic of Forest’s Classic Sudoku book 30 is a strategic win for Sysudoku Advanced. X-panel keys unlock an imbalanced web of 3, 6 and 8 candidates, allowing coloring clusters to carve it into four armies, which merge and wrap promptly.

Many placements are made in the bypass and in line marking, but with many unsatisfied 3-fills. Tracing it out, you can add  8-wing markers to prevent the addition of wing victims to the grid.


The grid with these markers reveals an imbalance of values , with 3, 6 and 8 predominating.








X-wings are spotted with routine checks in line marking, but finned X-wings  show up on an X-panel. Analyzing for both as each X-panel is completed, this fish and X-chain are spotted at the same time.





In this case, the X-panel jumps ahead of the bv map, adding a central bv to this XY network. There just has to be a way to connect a remote pair chain of at least four, and there is.









It takes a little follow up to get to the remote pair.



Now we can lay on a healthy blue/green cluster and still throw a red/orange one over the 36 bv.

Common values show that

Not(red and green) =>      orange or blue.

In cell r5c6, this fact traps 3, allowing a slink to merge red and blue, along with orange and green.

In the merged cluster, the trap in r1c2 => NW4 => SW3 wraps blue, and the solution is full of little green men.


Next week, be ready with your Classic 72. James Forest wants you to get the most from his other 240 puzzles. You may have two bv scan rewards right out of the line marking gate.





About Sudent

I'm John Welch, a retired engineering professor, father of 3 wonderful daughters and granddad to 7 fabulous grandchildren. Sudoku analysis and illustration is a great hobby and a healthy mental challenge.
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