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Replace the PassedDanger array by an equation

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This equation seems to do as well as the current PassedDanger array.

Master values were: 3, 7, 11, 20
The new values given by the equation are: 3, 6, 11, 18

STC:
LLR: 2.95 (-2.94,2.94) [-3.00,1.00]
Total: 84301 W: 18155 L: 18156 D: 47990
http://tests.stockfishchess.org/tests/view/5bda03180ebc595e0ae2518e

LTC:
LLR: 2.96 (-2.94,2.94) [-3.00,1.00]
Total: 7940 W: 1358 L: 1217 D: 5365
http://tests.stockfishchess.org/tests/view/5bdc69880ebc595e0ae27d28

We stopped a LTC run after 70000 games:
LLR: 0.74 (-2.94,2.94) [0.00,4.00]
Total: 70257 W: 11319 L: 11064 D: 47874
http://tests.stockfishchess.org/tests/view/5bdca8420ebc595e0ae281a9

Bench: 3913185
This commit is contained in:
protonspring 2018-10-31 09:05:44 -06:00 • committed by Stéphane Nicolet
parent 68209c9121
commit 3cbb05b1b8
1 changed files with 3 additions and 6 deletions
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9
src/evaluate.cpp
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@ -151,9 +151,6 @@ namespace {
S(-30,-14), S(-9, -8), S( 0, 9), S( -1, 7)
};
// PassedDanger[Rank] contains a term to weight the passed score
constexpr int PassedDanger[RANK_NB] = { 0, 0, 0, 3, 7, 11, 20 };
// Assorted bonuses and penalties
constexpr Score BishopPawns = S( 3, 7);
constexpr Score CloseEnemies = S( 6, 0);
@ -629,12 +626,12 @@ namespace {
assert(!(pos.pieces(Them, PAWN) & forward_file_bb(Us, s + Up)));
int r = relative_rank(Us, s);
int w = PassedDanger[r];
Score bonus = PassedRank[r];
if (w)
if (r > RANK_3)
{
int w = (r-2) * (r-2) + 2;
Square blockSq = s + Up;
// Adjust bonus based on the king's proximity
@ -675,7 +672,7 @@ namespace {
bonus += make_score(k * w, k * w);
}
} // w != 0
} // rank > RANK_3
// Scale down bonus for candidate passers which need more than one
// pawn push to become passed, or have a pawn in front of them.