from turtle import *
t=pen()
title("Шахова дошка")  
setup(300,300)
reset()
bgcolor("green");
pensize(1)
seth(0)
n=1
for y in range(125,-100,-30):
  up()
  goto(-125,y)
  down()
  for x in range(8):
    if n%2==0:
      color('black')
    else:
      color('white')
    begin_fill()
    for i in range(4):
        fd(30); rt(90)
    end_fill() 
    fd(30)
    n=n+1
  n=n-1
exitonclick()