HCha/Stockfish
1
0
Fork 0
mirror of https://github.com/HChaZZY/Stockfish.git synced 2025-12-21 09:37:16 +08:00
Code Issues Packages Projects Releases Wiki Activity

Use single value for KingProtector.

Browse Source 
After some recent big tuning session, the values for King Protector were
simplified to only be used on minor pieces. This patch tries to further
simplify by just using a single value, since current S(6,5) and S(5,6)
are close to each other. The value S(6,6) ended up passing, although
S(5,5) was also tried and failed STC.

STC
LLR: 2.95 (-2.94,2.94) [-3.00,1.00]
Total: 14261 W: 3288 L: 3151 D: 7822
http://tests.stockfishchess.org/tests/view/5b4ccdf50ebc5902bdb77f65

LTC
LLR: 2.96 (-2.94,2.94) [-3.00,1.00]
Total: 19606 W: 3396 L: 3273 D: 12937
http://tests.stockfishchess.org/tests/view/5b4ce4280ebc5902bdb7803b

Bench: 5448998
This commit is contained in:
Miguel Lahoz
2018-07-17 00:51:43 +08:00
committed by Stéphane Nicolet
parent 2ac35027d5
commit 3913726d1c
2 changed files with 3 additions and 5 deletions
Download Patch File Download Diff File Expand all files Collapse all files

6
src/evaluate.cpp
View File

@@ -154,9 +154,6 @@ namespace {
// PassedDanger[Rank] contains a term to weight the passed score
constexpr int PassedDanger[RANK_NB] = { 0, 0, 0, 3, 7, 11, 20 };
// KingProtector[knight/bishop] contains a penalty according to distance from king
constexpr Score KingProtector[] = { S(5, 6), S(6, 5) };
// Assorted bonuses and penalties
constexpr Score BishopPawns = S( 3, 7);
constexpr Score CloseEnemies = S( 6, 0);
@@ -164,6 +161,7 @@ namespace {
constexpr Score CorneredBishop = S( 50, 50);
constexpr Score Hanging = S( 52, 30);
constexpr Score HinderPassedPawn = S( 4, 0);
constexpr Score KingProtector = S( 6, 6);
constexpr Score KnightOnQueen = S( 21, 11);
constexpr Score LongDiagonalBishop = S( 22, 0);
constexpr Score MinorBehindPawn = S( 16, 0);
@@ -342,7 +340,7 @@ namespace {
score += MinorBehindPawn;
// Penalty if the piece is far from the king
score -= KingProtector[Pt == BISHOP] * distance(s, pos.square<KING>(Us));
score -= KingProtector * distance(s, pos.square<KING>(Us));
if (Pt == BISHOP)
{