private bool RemoveFromOtherBoxesInRegion(MutablePuzzle puzzle, Region region, SudokuValues value, int boxIndex)
        {
            var anyChanged = false;

            for (int i = 0; i < Puzzle.LineLength; i++)
            {
                var coords = region.GetCoordinate(i);

                if (coords.Box == boxIndex)
                {
                    continue;
                }

                var cell = region[i];

                if (!cell.IsSingle && cell.HasAnyOptions(value))
                {
                    var update = new CellUpdate(value, coords);
                    puzzle.RemoveOptions(update);
                    anyChanged = true;
                }
            }

            return(anyChanged);
        }
 public void RemoveOptions(CellUpdate update) => RemoveOptions(update.Coordinate, update.RemovedOptions);