Wex 434 Hidden UR, AIC, Trap, Boxline Wrap

Beeby finds S5 naked single in the bypass, but that requires unproductive number scanning. Naked singles don’t escape Sysudoku Basic.

This one shows up in line marking,

when r9c4 sees 4 and 9.

After line marking, with r5 completed,

A hidden unique rectangle emerges.  If 4r24 were true, the slinks would carry 6 to adjacent corners, forcing 4 to the opposite corner.

A boomer turned ANL removing 2r8c8 is extended to an ANL (red) removing 4r1c6. Then an ANL (green) removing 4r2c5 for N69, r2s24, N4 and C4.

Adding the blue/green cluster, 4r6c3 exits by the trap, or by the finned 4-wing.

It takes an AIC ANL to remove 2r1c7, and

to wrap green, for 

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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