In Chess
One popular strategy for constructing evaluation functions is as a weighted sum of various factors that are thought to influence the value of a position. For instance, an evaluation function for chess might take the form
- c1 * material + c2 * mobility + c3 * king safety + c4 * center control + ...
Such as
- f(P) = 200(K-K') + 9(Q-Q') + 5(R-R') + 3(B-B'+N-N') + (P-P') - 0.5(D-D'+S-S'+I-I') + 0.1(M-M') + ...
in which:
- K, Q, R, B, N, P are the number of white kings, queens, rooks, bishops, knights and pawns on the board.
- D, S, I are doubled, backward and isolated white pawns.
- M represents white mobility (measured, say, as the number of legal moves available to White).
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