Checking for collision between two turtles not working when positions overlap

Question

I'm trying to check if the chaser turtle collides with the runner turtle, but every time the chaser turtle get's close to the runner turtle, the print("Collision") never executes.

#   import relevant modules
from cProfile import run
from secrets import choice
import turtle as trtl
import random as rand

#   create variables for turtle player controller
moveAmount = 1

#   create variables for turtle finish line
runnerLocactionX = rand.randint(600, 900)
runnerLocactionY = rand.randint(-450 ,450)
turtleColors = ["red", "blue", "green", "orange", "purple", "gold"]


#   initialize Turtle player controller
chaser = trtl.Turtle(shape="square")
chaserLocationX = rand.randint(-600, 600)
chaserLocationY = rand.randint(-450 ,450)
chaserInitialLocation = (chaserLocationX, chaserLocationY)
chaser.penup()
chaser.goto(chaserInitialLocation)
chaser.pendown()

#   initialize runner
runner = trtl.Turtle(shape="square")
runner.pencolor(rand.choice(turtleColors))
runner.fillcolor(rand.choice(turtleColors))
runner.penup()
runner.goto(runnerLocactionX, runnerLocactionY)
runner.setheading(90)

#  Event handlers for changing direction
def goUp():
    chaser.setheading(90)
def goDown():
    chaser.setheading(270)
def goLeft():
    chaser.setheading(180)
def goRight():
    chaser.setheading(0)

def movechaser():
    chaser.forward(moveAmount)

#  Event handlers for collision detection 

def is_collided_with(a, b):
    return abs(a.xcor() - b.xcor()) < 10 and abs(a.ycor() - b.ycor()) < 10

def Collision():
    if is_collided_with(chaser, runner):
        print("Collision")
    else:
        print("No Collision!")

#   listen for events
wn = trtl.Screen()
wn.onkeypress(goUp, 'Up')
wn.onkeypress(goDown, 'Down')
wn.onkeypress(goLeft, 'Left')
wn.onkeypress(goRight, 'Right')
wn.onkeypress(movechaser, 'w')
wn.listen()

Collision()

wn.mainloop()

I've tried checking the distance, but the program closes after running. Also, I tried getting rid of the abs on both xcor and ycor, but nothing changed.

#  Event handlers for collision detection 
collision = turtle.Turtle()

collision.hideturtle()

if chaser.distance() == runner.distance():

    collision.goto(0,0)

    collision.showturtle()

    collision.write("COLLISION")