turtle circle drawing

from turtle import *
screensize(canvwidth=200,canvheight=200)
speed("fastest")
hideturtle()
for i in range(10):
    for j in range(10):
        if i % 2 ==0 and j%2 ==0:
            fillcolor("green")
        elif i % 2 == 0 and j%2 ==1:
            fillcolor("yellow")
        elif i % 2 == 1 and j%2 ==0:
            fillcolor("pink")
        elif i % 2 == 1 and j%2 ==1:
            fillcolor("blue")      
        up()
        setx(i*20)
        sety(j*20)
        down()
        begin_fill()
        circle(10)
        end_fill()