public static int determinApproporiateDepth(MorrisBoard bd) {		
		int depth = SEARCH_DEP_LIMIT_DEFAULT;
		int numWhite = bd.countWhite();
		if (numWhite < 3) {
			depth = UNVALIED;
		}
		else if (numWhite == 3) {
			depth = 3;
		}
		else {
			int numEmpty = bd.countEmpty();
			if ((numEmpty >= HIGH_BOTTOM) && (numEmpty <= HIGH_TOP)) {
				depth = depthForHigh(numEmpty);
			}
			else if ((numEmpty >= MED_BOTTOM) && (numEmpty <= MED_TOP)) {
				depth = depthForMed(numEmpty);
			}
			else if ((numEmpty >= LOW_BOTTOM) && (numEmpty <= LOW_TOP)) {
				depth = depthForLow(numEmpty);
			}			
		}

		
		return depth;
	}