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)]

    def draw(self):
        for i in range(self.r):
            for j in range(self.c):
                pygame.draw.rect(wn, self.colors[(j + i) % 2],
                                 (self.x + j * self.w,
                                  self.y + i * self.h,
                                  self.w, self.h))