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King safety tuning with values obtained by SPSA.

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Part I:

LTC:

LLR: 2.96 (-2.94,2.94) [0.00,4.00]
Total: 11529 W: 2075 L: 1882 D: 7572

Part II:

LTC:

ELO: 2.07 +-2.1 (95%) LOS: 97.3%
Total: 34859 W: 5967 L: 5759 D: 23133

Bench: 7374604

Resolves #228
This commit is contained in:
NicklasPersson
2015-01-28 21:00:09 +00:00
committed by Joona Kiiski
parent 9f0d5241bf
commit 7837fb2aca
2 changed files with 36 additions and 36 deletions
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30
src/evaluate.cpp
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@@ -91,7 +91,7 @@ namespace {
// Evaluation weights, indexed by evaluation term
enum { Mobility, PawnStructure, PassedPawns, Space, KingSafety };
const struct Weight { int mg, eg; } Weights[] = {
{289, 344}, {233, 201}, {221, 273}, {46, 0}, {321, 0}
{289, 344}, {233, 201}, {221, 273}, {46, 0}, {324, 0}
};
#define V(v) Value(v)
@@ -186,15 +186,15 @@ namespace {
// index to KingDanger[].
//
// KingAttackWeights[PieceType] contains king attack weights by piece type
const int KingAttackWeights[] = { 0, 0, 6, 2, 5, 5 };
const int KingAttackWeights[] = { 0, 0, 8, 4, 4, 1 };
// Bonuses for enemy's safe checks
const int QueenContactCheck = 92;
const int RookContactCheck = 68;
const int QueenCheck = 50;
const int RookCheck = 36;
const int BishopCheck = 7;
const int KnightCheck = 14;
const int QueenContactCheck = 89;
const int RookContactCheck = 72;
const int QueenCheck = 51;
const int RookCheck = 38;
const int BishopCheck = 5;
const int KnightCheck = 16;
// KingDanger[attackUnits] contains the actual king danger weighted
// scores, indexed by a calculated integer number.
@@ -411,11 +411,11 @@ namespace {
// number and types of the enemy's attacking pieces, the number of
// attacked and undefended squares around our king and the quality of
// the pawn shelter (current 'score' value).
attackUnits = std::min(77, ei.kingAttackersCount[Them] * ei.kingAttackersWeight[Them])
+ 10 * ei.kingAdjacentZoneAttacksCount[Them]
+ 19 * popcount<Max15>(undefended)
+ 9 * (ei.pinnedPieces[Us] != 0)
- mg_value(score) * 63 / 512
attackUnits = std::min(74, ei.kingAttackersCount[Them] * ei.kingAttackersWeight[Them])
+ 9 * ei.kingAdjacentZoneAttacksCount[Them]
+ 25 * popcount<Max15>(undefended)
+ 10 * (ei.pinnedPieces[Us] != 0)
- mg_value(score) / 8
- !pos.count<QUEEN>(Them) * 60;
// Analyse the enemy's safe queen contact checks. Firstly, find the
@@ -891,13 +891,13 @@ namespace Eval {
void init() {
const double MaxSlope = 7.5;
const double MaxSlope = 8.5;
const double Peak = 1280;
double t = 0.0;
for (int i = 1; i < 400; ++i)
{
t = std::min(Peak, std::min(0.025 * i * i, t + MaxSlope));
t = std::min(Peak, std::min(0.027 * i * i, t + MaxSlope));
KingDanger[i] = apply_weight(make_score(int(t), 0), Weights[KingSafety]);
}
}