mobility evaluation of stockfish
Posted: Sat Oct 09, 2010 4:17 pm
I looked at the code of stockfish1.9 and it seems to me that the mobility evaluation is linear in the number of squares(except big number of squares and the difference in evaluation between controling 0 squares and controling 2 seaures is generally the same as the difference in evaluation between controling 4 squares and controling 2 squares)
I think that it is not logical to do it and it is may be better to reduce the mobility score for controling small number of squares.
stockfish has the following code
I suggest to change it to reduce the numbers of every line by
15(for 0 squares),10 (for 1 squares),6 (for 2 squares) 3 (for 3 squares),
1 (for 4 squares)
I wonder if somebody tested this idea or is interested in testing it.
I think that it is not logical to do it and it is may be better to reduce the mobility score for controling small number of squares.
stockfish has the following code
Code: Select all
const Score MobilityBonus[][32] = {
{}, {},
{ S(-38,-33), S(-25,-23), S(-12,-13), S( 0, -3), S(12, 7), S(25, 17), // Knights
S( 31, 22), S( 38, 27), S( 38, 27) },
{ S(-25,-30), S(-11,-16), S( 3, -2), S(17, 12), S(31, 26), S(45, 40), // Bishops
S( 57, 52), S( 65, 60), S( 71, 65), S(74, 69), S(76, 71), S(78, 73),
S( 79, 74), S( 80, 75), S( 81, 76), S(81, 76) },
{ S(-20,-36), S(-14,-19), S( -8, -3), S(-2, 13), S( 4, 29), S(10, 46), // Rooks
S( 14, 62), S( 19, 79), S( 23, 95), S(26,106), S(27,111), S(28,114),
S( 29,116), S( 30,117), S( 31,118), S(32,118) },
{ S(-10,-18), S( -8,-13), S( -6, -7), S(-3, -2), S(-1, 3), S( 1, 8), // Queens
S( 3, 13), S( 5, 19), S( 8, 23), S(10, 27), S(12, 32), S(15, 34),
S( 16, 35), S( 17, 35), S( 18, 35), S(20, 35), S(20, 35), S(20, 35),
S( 20, 35), S( 20, 35), S( 20, 35), S(20, 35), S(20, 35), S(20, 35),
S( 20, 35), S( 20, 35), S( 20, 35), S(20, 35), S(20, 35), S(20, 35),
S( 20, 35), S( 20, 35) }
};
15(for 0 squares),10 (for 1 squares),6 (for 2 squares) 3 (for 3 squares),
1 (for 4 squares)
I wonder if somebody tested this idea or is interested in testing it.