public ChessGame Parse(IEnumerable<String> pgn, IChessMoveNotation moveNotation)
{
var lines = pgn.GetEnumerator();
var metainfo = ParseTags(lines);
var movetext = ParseMovetext(lines);
var game = new ChessGame(metainfo);
foreach (ChessMove cm in ParseMoves(movetext, moveNotation, game.Players))
game.AddMove(cm);
return game;
}