Forked and approved

I think that may be the intended lesson of the kata (locality of reference for row-major matrices which makes more efficient use of the cache)

Fixed

Replaced with SVG (thanks to awesomead again)

Hello!

I updated the description, I hope it is clearer now.

Thanks!

• looks ok as it is now (preloaded). You could just put that in the tests, actually.
• not enough tests, I think: the kata is supposed to be performances heavy. Did you compare how much time your python solution takes?

Valid suggestion, changed to dash (—)

That's true, normally this part in the description should make that clear.

Points outside of the plane                 Rectangular frame around the plane
  
   1/ / / /     0 -> [1, -1]                +-/-/-/-/       - -> all valid locations for points
  0/ / / /3     1 -> [2, -1]                -/-/-/-/-       + -> all invalid locations for points 
  / / / /2      2 -> [0, 3]                 /-/-/-/-+
                3 -> [1, 3]

For anyone still wondering...

----------- 37
X O _ _ | X _ _ _ | O O O X | X _ O X
_ X _ _ | _ _ _ _ | X _ _ _ | X O X O
_ O X O | O X O O | _ O O O | O _ X X
_ _ X _ | _ _ _ O | O O X X | _ X X _

It is the O in the 3rd row that are 4-in-a-row if you look at them like shown below (I made the other symbols as . just for clarity)

_ . . O | . . O . | _ O . . | O _ . .

Approved!

Thanks for the problem, I'll do random tests now