private String getCastlingFEN_Segment() {
		StringBuilder sb=new StringBuilder();
		if(getWhite_king().isNotMovedYet())
		{
			sb.append('K').append('Q');
		}
		if(getBlack_king().isNotMovedYet())
		{
			sb.append('k').append('q');
		}
		if(sb.length()==0)
		{
			sb.append("-");
		}
		return sb.toString();
	}