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Remove Overload bonus

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Compensate by giving the Hanging bonus to weak doubly-attacked
non pawn enemies pieces.

STC: http://tests.stockfishchess.org/tests/view/5bfd53c40ebc5902bced9237
LLR: 2.96 (-2.94,2.94) [-3.00,1.00]
Total: 62107 W: 13664 L: 13622 D: 34821

LTC: http://tests.stockfishchess.org/tests/view/5bfd74700ebc5902bced9618
LLR: 2.96 (-2.94,2.94) [-3.00,1.00]
Total: 86406 W: 14381 L: 14365 D: 57660

A possible follow up would be to tune the hanging bonus and/or try to
simplify the hanging bonus condition.

Bench: 3810849
This commit is contained in:
ElbertoOne
2018-12-01 10:28:10 +01:00
committed by Stéphane Nicolet
parent 9b276a6596
commit 79e3710fd2
2 changed files with 5 additions and 7 deletions
Download Patch File Download Diff File Expand all files Collapse all files

4
AUTHORS
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@@ -20,9 +20,9 @@ Balint Pfliegel
Ben Koshy (BKSpurgeon)
Bill Henry (VoyagerOne)
braich
Bojun Guo (noobpwnftw)
Brian Sheppard (SapphireBrand)
Bryan Cross (crossbr)
Bujun Guo (noobpwnftw)
Chris Cain (ceebo)
Dan Schmidt
Daniel Dugovic (ddugovic)
@@ -31,7 +31,6 @@ David Zar
Daylen Yang (daylen)
DiscanX
Eelco de Groot
ElbertoOne
erbsenzaehler
Ernesto Gatti
Fabian Beuke (madnight)
@@ -76,6 +75,7 @@ Leonardo Ljubičić (ICCF World Champion)
Leonid Pechenik (lp--)
Linus Arver
loco-loco
Lub van den Berg (ElbertoOne)
Luca Brivio (lucabrivio)
Lucas Braesch (lucasart)
Lyudmil Antonov (lantonov)

8
src/evaluate.cpp
View File

@@ -160,7 +160,6 @@ namespace {
constexpr Score KnightOnQueen = S( 20, 12);
constexpr Score LongDiagonalBishop = S( 44, 0);
constexpr Score MinorBehindPawn = S( 16, 0);
constexpr Score Overload = S( 12, 6);
constexpr Score PawnlessFlank = S( 18, 94);
constexpr Score RestrictedPiece = S( 7, 6);
constexpr Score RookOnPawn = S( 10, 28);
@@ -553,10 +552,9 @@ namespace {
if (weak & attackedBy[Us][KING])
score += ThreatByKing;
score += Hanging * popcount(weak & ~attackedBy[Them][ALL_PIECES]);
b = weak & nonPawnEnemies & attackedBy[Them][ALL_PIECES];
score += Overload * popcount(b);
b = ~attackedBy[Them][ALL_PIECES]
| (nonPawnEnemies & attackedBy2[Us]);
score += Hanging * popcount(weak & b);
}
// Bonus for restricting their piece moves