If statement with .include? keeps evaluating to false

So I have been working on a little project for personal use that basically presents a position on a chess board and then you get to choose black or white.(I think) everything is working correctly except that I can't get the if statement with the .include() to work. I have looked for solutions and tried playing around with it but it keeps evaluating false and shows red. The full 70 line program is here but you probably only need to look at the issue which I also copied and put separately for clarity at the bottom at: if whitesquares.include?... Note: I'm also using ruby2d gem

set title: 'Chess Squarez', background: 'black' , width: 1600, height: 900
set resizable: true
x = true
white = Square.new(color: 'white', x:1200, y: 500, size: 200, z:1)
black = Square.new(color: 'white', x:1200, y: 200, size: 200, z:1)
whitetext = Text.new("White", color: 'black', x:1200, y: 550, size: 75, z:2)
blacktext = Text.new("Black", color: 'black', x:1200, y: 250, size: 75, z:2)

whitesquares =  ["B1","D1","F1","H1",
                 "A2","C2","E2","G2",
                 "B3","D3","F3","H3",
                 "A4","C4","E4","G4",
                 "B5","D5","F5","H5",
                 "A6","C6","E6","G6",
                 "B7","D7","F7","H7",
                 "A8","C8","E8","G8"]

blacksquares =   ["A1","C1","E1","G1",
                  "B2","D2","F2","H2",
                  "A3","C3","E3","G3",
                  "B4","D4","F4","H4",
                  "A5","C5","E5","G5",
                  "B6","D6","F6","H6",
                  "A7","C7","E7","G7",
                  "B8","D8","F8","H8"]

square = Square.new(
  x:550, y: 200, z: 1,
  size: 500,
  color: 'white'
)
exit = Square.new(color: 'white', z:1)

text = Text.new('Start', x:575, y: 325, z: 2, color: 'black', size: 200)
textexit = Text.new('Exit', color: 'black', size: 50, x: 5, y: 20 , z: 2)

on :mouse_down do |event|
    if square.contains?(event.x,  event.y)
      clear
      square.add
      exit.add
      textexit.add
      white = Square.new(color: 'white', x:1200, y: 500, size: 200, z:1)
      black = Square.new(color: 'white', x:1200, y: 200, size: 200, z:1)
      whitetext.add
      blacktext.add
      num = rand(1..8).to_s
      let = ('a'..'h').to_a[rand(8)].capitalize
      letnum = let + num
      pos = Text.new(letnum, x:575, y: 325, z: 2, color: 'black', size: 200 )
    end
    if white.contains?(event.x,  event.y)
        if whitesquares.include?(letnum)
          white = Square.new(color: 'green', x:1200, y: 500, size: 200, z:1)
        else
          white = Square.new(color: 'red', x:1200, y: 500, size: 200, z:1)
        end
    end
    if black.contains?(event.x,  event.y)
      if blacksquares.include?(letnum)
        black = Square.new(color: 'green', x:1200, y: 200, size: 200, z:1)
      else
        black = Square.new(color: 'red', x:1200, y: 200, size: 200, z:1)
      end
  end
  if exit.contains?(event.x,  event.y)
    close
  end
end

show

    if white.contains?(event.x,  event.y)
        if whitesquares.include?(letnum)
          white = Square.new(color: 'green', x:1200, y: 500, size: 200, z:1)
        else
          white = Square.new(color: 'red', x:1200, y: 500, size: 200, z:1)
        end
    end
    if black.contains?(event.x,  event.y)
      if blacksquares.include?(letnum)
        black = Square.new(color: 'green', x:1200, y: 200, size: 200, z:1)
      else
        black = Square.new(color: 'red', x:1200, y: 200, size: 200, z:1)
      end
  end