private BoardMove FindExactMove(StandardAlgebraicNotation san, BoardLocation destination)
{
var from = BoardLocation.At(san.FromFileX.Value, san.FromRankY.Value);
var item = _boardState.GetItem(@from);
var mv = item.Paths.FindMove(@from, destination);
var moveList = item.Paths.FlattenMoves().Select(m => m.ToChessCoords()).Aggregate((s, v) => s += $"{v},");
if (mv == null)
{
Throw.MoveNotFound($"Cannot find move matching '{san.ToNotation()}', destination '{destination.ToChessCoord()}', moveList '{moveList}");
}
return(mv);
}