private IEnumerable <ConnectFourState> GetStatesFromData(string dataFileName)
{
var fileProvider = new EmbeddedFileProvider(Assembly.GetAssembly(GetType()));
var boards = fileProvider.ReadAllText(dataFileName)
.SplitOnNewLine()
.Batch(ConnectFourState.NumRows + 1);
foreach (var rows in boards)
{
var board = rows
.Reverse() // reverse the order because the bottom-left position is actually the first element in the board state
.Skip(1) // skip the delimiter row at the bottom of the board (i.e. "-------")
.Select(row => row.PadRight(ConnectFourState.NumCols))
.SelectMany(s => s.Select(c => c == 'X' ? X : c == 'O' ? O : _))
.ToArray();
var state = new ConnectFourState(board);
yield return(state);
}
}