// data
function Data(whitePlayer, blackPlayer, 
              title1, title2, caption, 
              moves, ambiguities,
              moveNumber, whiteToMove, position) {
    this.whitePlayer = whitePlayer
    this.blackPlayer = blackPlayer
    this.title1 = title1
    this.title2 = title2
    this.caption = caption
    this.moves = moves
    this.ambiguities = ambiguities
    this.moveNumber = moveNumber
    this.whiteToMove = whiteToMove
    this.position = position
}