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Use single value for KingProtector.

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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
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2
AUTHORS
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@ -82,6 +82,7 @@ Mark Tenzer (31m059)
Michael Byrne (MichaelB7)
Michael Stembera (mstembera)
Michel Van den Bergh (vdbergh)
Miguel Lahoz (miguel-l)
Mikael Bäckman (mbootsector)
Mike Whiteley (protonspring)
Miroslav Fontán (Hexik)
@ -118,4 +119,3 @@ Tom Vijlbrief (tomtor)
Torsten Franz (torfranz)
Uri Blass (uriblass)
Vince Negri
xoroshiro

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)
{