Turnablock
a.k.a. Rugs
You are given a matrix of coins showing either heads or tails. A move consists of turning over all the coins in any rectangular block of coins. You must specify the southeast corner, (x,y), and the northwest corner, (a,b), of the rectangle, where 1≤a≤x and 1≤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:
1≤a≤x and 1≤b≤y