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#1: Jota (jota) on Mar 8, 2019 [SPOILER]

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I did guess to position a couple of reds, but could see later that they were incorrect to make the greens work. I don’t know about much guessing.

Yeah, I had to do a lot of guessing, though I suppose a case could be made for Deep Lookahead.

Ouch!

Initial line & color logic gets to 49%. Black and blue are complete, and there are only 2 squares of red left. Everything else is green.

R16: EL marks C4-6 white.
C5: EL marks R7 white.
R5: EL marks C14-C23 white.
C10: EL marks R18-28 white.

Deep lookahead C4: If the green 2 is in R14-15, it forces the green 2s in C7-8 to both be in R7-8 and R10-11. This only leaves room for one of the 2s in C6. Therefore R15C4 must be white.

Deep lookahead C4 again: If the green 2 is in R13-14, it forces the bottom green 2s in C7-8 to be in R15-16. The bottom green 2 in C6 goes into R11-12. This makes R9-10 C7-8 green, and now the remaining green 2 in C6 would have to go into R7-8, but these both have 2 clues available and only 1 square of space. Therefore, R14C4 is white.

Now we can do a small amount of line logic.

Deep lookahead C7: If the 2nd green 2 goes into R10-11, the green in C7 goes into R13 and the green in C8 goes into R13-15. This places the 2nd green in C6 into R14-15. Now the green 2s in C8 need to go into R7-8 and R10-11, and there is no longer anywhere for the first green 2 in C6 to go. Therefore, R10-11 C7 are white.

Line & color logic finishes the red and places more green. C1-9 and R1-10 are now finished, and we are 68% complete.

C10: Whichever way the bottom 3 goes, R15C11 is white.

Not currently seeing anything conclusive from here. I'm leaning towards "guessing" on this puzzle.

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