Puzzle Description:

Well done, and now for a puzzle: Move one match, and make the equality correct (Don't turn it into an inequation).

#1: Thomas Genuine (Genuine) on Aug 8, 2013 [SPOILER]

Grats! :)) It's good puzzle!
142 - 3 = 139

weird 4, but its works out

Currently at 67%. I think I have exhausted color logic but I'm not 100% certain.

I have 9 4 clues remaining on the horizontal, and 9 sets of clues on the vertical that would support 4s. That means if a horizontal 4 can fit, there must be one. The only question is which one goes where.

C47-50: The only 4 that is valid here is in R6, so R6 C48-50 is black. L&CL.

C10-14: R7 can't have a 4 here, and the 1s will be needed for R5 or R6. We can mark C11-13 white. C14 can't be black here either and R7C14 can no longer be red, so we can mark R7C14 white as well. L&CL.

C16-19: R2, R7, and R10 do not have 4s available. These rows are white in these columns.

Line & color logic to finish.

Found to be solvable with moderate lookahead by wombatilim.

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