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AIMA-Java Core Algorithms from the book Artificial Intelligence a Modern Approach 3rd Ed.

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package aima.core.environment.nqueens;

import aima.core.search.framework.HeuristicFunction;

/**
 * Estimates the distance to goal by the number of attacking pairs of queens on
 * the board.
 * 
 * @author R. Lunde
 */
public class AttackingPairsHeuristic implements HeuristicFunction {

	public double h(Object state) {
		NQueensBoard board = (NQueensBoard) state;
		return board.getNumberOfAttackingPairs();
	}
}