Puzzle Description:

E= mc2

#1: Petra Lassen (stjarna) on Feb 21, 2009

Solvable w logic alone although I used symmetry logic in the end because I'm lazy.

Pretty puzzle. Even though I thought I knew what it would be the wonderful use of color made it a fun puzzle.

It is not common - it's the only one there is!

Using line and color logic, I got to the point where only some of the black dots around the letter "C" needed filling in. I had six unknown squares in the top part, and six in the bottom part. I didn't want to use symmetry, so instead I used summing. From the row clues I could see that the top and bottom parts each needed to have three black squares filled into the six unknown squares. From the column clues it was obvious that columns 36 and 38 there had to be one black square each on the top and the bottom. That meant that the only other column with unknowns in it, column 33, had to have one black on top and one on the bottom. That tells me just where the black 8 in that column has to be, and the rest of the puzzle solves easily.

I don't Leigh's comment about this being the "only one". Einstein had lots and lots of equations. When he was 26 years old, and was working in a Swiss patent office because nobody would give him a job teaching physics, he published four stunning papers whose results are still covered in every high school physics class these days, but which completely ignored at the time: the photoelectric effect as proof that light is quantum, Brownian motion explained by atomic motion, special relativity, and mass-energy equivalence. The E=mcc equation is from the last, and is probably the only one of his equation known to people who don't understand it, but all the papers, as well as his later papers, were packed full of interesting and important equations.

I used color logic up to the last bit.

Extended smile logic: dot at R7C33 makes contradiction in R8C36-38.

Found to be solvable with moderate lookahead by blurglecruncheon.

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