private void openNothings()
	{
		int flags = 0;
		final TileSet nothings = new TileSet(mField);
		final int size = nothings.size();
		for (int tile = 0; tile < size; tile++ )
		{
			final MaskValue mask = mField.getMaskValue(tile);
			if (mask.isFlag()) flags++ ;
			if (mask.isNothing()) nothings.add(tile);
		}
		if (mAnalyzer.getBombs() == flags) for (int tile : nothings)
			mAnalyzer.userOpenTile(Tile.getX(tile), Tile.getY(tile));
	}