#!/usr/bin/env python
# coding: utf
'''
'''

from turtle import *

def square(x,y,l,tofill=False):
    up()
    goto(x,y)
    fill(tofill)
    down()
    for i in xrange(4):
        forward(l)
        left(90)
    fill(False)

N=8
reset()
w,h=screensize()
w=h=min(w,h)
screensize(w,h)
speed("fastest")
for x in xrange(N):
    for y in xrange(N):
        square(-w+w*2*x/N,-h+h*y*2/N,w*2/N,(x+y)%2)

exitonclick()