class Go:
  # 1: B, 0: _, -1: W
  # resp. jakákoli čísla s opačnými znaménky
  board=[[0]*19 for i in range(19)]
  
  def __init__(self): self.board=[[0]*19 for i in range(19)]
  
  def move(self,color,y,x):
    if self.board[x][y]!=0: return False

    self.board[x][y]=color

    for i,j in ((-1,0),(1,0),(0,-1),(0,1)):
      self.temp=[[False]*19 for i in range(19)]
      if not self._floodFill(-color,x+i,y+j): self._remove()
    self.temp=[[False]*19 for i in range(19)]
    if not self._floodFill(color,x,y):
      self.board[x][y]=0
      return False
    return True

  def _floodFill(self,color,x,y):
    if x<0 or x>18 or y<0 or y>18: return False
    if self.temp[x][y]: return False
    if self.board[x][y]==0: return True
    if self.board[x][y]!=color: return False
    self.temp[x][y]=True
    return self._floodFill(color,x-1,y) or self._floodFill(color,x+1,y) or self._floodFill(color,x,y-1) or self._floodFill(color,x,y+1)
  
  def _remove(self):
    for i in range(19):
      for j in range(19):
        if self.temp[i][j]: self.board[i][j]=0