peek at solution solve puzzle
quality: difficulty: solvability: moderate lookahead
Puzzle Description:
(This puzzle was recovered from the 2016 database crash. Puzzle creators, please edit this puzzle and put the real description here!)
#1: Brian Bellis (mootpoint) on Sep 7, 2018
Stomach#2: Jota (jota) on Mar 5, 2019
I need help solving this!#3: Eric (kelalatir) on Oct 6, 2020 [HINT]
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.#4: Joe (infrapinklizzard) on Nov 20, 2020 [HINT]
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#5: Web Paint-By-Number Robot (webpbn) on Nov 20, 2020
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.#6: Web Paint-By-Number Robot (webpbn) on Nov 20, 2020
Found to have a unique solution by infrapinklizzard.
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