Puzzle Description Suppressed:Click below to view spoilers

#1: Brian Bellis (mootpoint) on Sep 7, 2018

Stomach

I need help solving this!

I solved it using end logic, starting with the 5 in column 20. I don't know if it is necessary, but some of the end logic included working in from the bottom right corner, so some end logic along row 20 is also needed.

Once you have several columns on the right side solved, then I was able to use internal end logic on the 7 in column 10. That eventually led me to the ultimate solution.

I may have missed a step or two, but perhaps this will serve as a general guide.

No LL
Edge logic 5 c20 = c1-3 white.
Distant Edge Logic 5 c20 (vs c28) = r16-20 white
EL 5 c20 = r13-15 white
LL

Two way logic on the 5 in c20: (It can only be in r4-8 or r8-12). Either way, c19r1, r5, r17-20 must be white, and c29r12 must be red.

EL 6 r1 limits it to [c12-18] so c13-17 must be red.
LL

Internal Edge Logic 6 r18: if it were to go right past c16, it would cause a conflict in either r17 or r19 (because of the 1s in c13 & c16). Therefore r18c17-18 must be white
LL

DEL 5 c19 (vs c17) = r16 w
LL

two-way Logic 2 c15: either way, c14r4-12, r18-20 must be white
LL

IEL 2 c14: if it were in r13-14, it would cause a conflict in c13. So c14r13-14 must be white
LL to finish

(Some of this may not be necessary)

Found to be solvable with moderate lookahead by infrapinklizzard.

Found to have a unique solution by infrapinklizzard.

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