TO move
    ca
    
    checkerboard
    
    cro 16
    
    ask turtles
    [
       set size 2
       set color blue
       
       pd
       if remainder who 2 = 1 [fd 7.576742 ]
       
       if remainder who 2 = 0 
       [
           ifelse remainder who 4 = 0
           [
               fd 7
           ]
           [
               fd 9.89945
           ] 
         
       ]
    ]
end

to checkerboard
   ask patches [ ifelse remainder (pxcor + pycor) 2 = 0 [ set pcolor 
white ] [ set pcolor red ] ]   
  
end