pygame.init() initialize all imported pygame modules. No exceptions will be raised if a module fails, but the total number if successful and ...
PDR = pygame.Rect(0, 0, 600, 600)
PDS = pygame.display.set_mode(PDR.size)
FONT = pygame.font.SysFont("arial", 20)

# create a checker board
checker = pygame.Surface((512, 512))
for pos in range(64):
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