Appendix to lecture 6-08-00
……. L f8-f3
If ph2:Lf3 Q b6- e3
If Qh3: Lf3 be7-h4 and the black are loosing the Quen.
f(P)= 200(K – K') + 9(Q
– Q') + 5(R – R') + 3(B – B'
+ N – N')_
– .5(D – D' + S – S' + I – I') + .1(M – M') + . . . ,
in which: -
K, Q, R, B, N, P is the number of White kings, queens, bishops, knights, and pawns on the board.
D, S, I are doubled, backward, and isolated White pawns.
M is White’s mobility (measured, say, as the number of legal moves available to White).
Prime letters are the similar quantities for Black.
The coefficients 9, 5, and 3 are the widely accepted valuations of relevant chess pieces; the coefficient 200 for the king allows recognizing the end of the game. The coefficients .5 and .1 are merely Shannon’s rough estimates of corresponding positional parameters.