class Board:
        def __init__(self, x, y, w, h, r, c):
            self.x = x
            self.y = y
            self.w = w
            self.h = h
            self.r = r
            self.c = c
            self.colors = [(255, 255, 255),
                           (0, 0, 0)]
            self.rects = [
                (
                    self.colors[(j + i) % 2],
                    pygame.Rect(self.x + j * w,
                                y + i * h,
                                w, h)
                    )
                for i in range(r)
                for j in range(c)]

        def draw(self):
            for color, rect in self.rects: