#diagonal.line  an oblique line of squares of the same color on a checkerboard; "the bishop moves on the diagonals"
  supertype:  #line.formation  #line
  subtype:  #main_diagonal  #secondary_diagonal
  part of:  #checkerboard  a board having 64 squares of two alternating colors
     part of:  #checkers__draughts  a checkerboard game for two players who each have 12 pieces; the object is to jump over and so capture the opponent's pieces
     part of:  #chess_game__chessgame__chess__ches  a game for two players who move their 16 pieces according to specific rules; the object is to checkmate the opponent's king

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