public void CountUp(out int black_num, out int white_num)
{
black_num = 0;
white_num = 0;
for(int x=1; x<=width; ++x)
for(int y=1; y<=height; ++y)
{
if(board[x, y] == ReversiColor.Black) black_num++;
if(board[x, y] == ReversiColor.White) white_num++;
}
}