Turning Corners
JavaScript
You are given a matrix of coins showing either heads or tails. A move consists of turning over four coins at the corners of a rectangle, i.e. (a,b), (a,y), (x,b), and (x,y), where 0≤a<x and 0≤b<y. The southeast coin, (x,y), must go from heads to tails. Last to move wins. To start, click the Newgame button.
Southeast coin: x:
y:
from heads to tails
Northwest coin: a:
b:
both a < x and b < y