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Rook tweaks in evaluation

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Some small changes in evaluation to try to convince Stockfish to centralize
her rooks more in middle game and avoid trapping them in the corners. Joint
work by SFisGOD and snicolet.

STC:
LLR: 2.96 (-2.94,2.94) [0.00,4.00]
Total: 99826 W: 21895 L: 21341 D: 56590
http://tests.stockfishchess.org/tests/view/5bdc3e280ebc595e0ae277df

LTC:
LLR: 2.95 (-2.94,2.94) [0.00,4.00]
Total: 21467 W: 3541 L: 3322 D: 14604
http://tests.stockfishchess.org/tests/view/5bdc9ff30ebc595e0ae28119

Bench: 3631608
This commit is contained in:
Stéphane Nicolet 2018-11-02 22:04:43 +01:00 • committed by Stéphane Nicolet
parent 3f1eb85a1c
commit 8bb7a73708
2 changed files with 4 additions and 4 deletions
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6
src/evaluate.cpp
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@ -127,7 +127,7 @@ namespace {
// RookOnFile[semiopen/open] contains bonuses for each rook when there is
// no (friendly) pawn on the rook file.
constexpr Score RookOnFile[] = { S(20, 7), S(45, 20) };
constexpr Score RookOnFile[] = { S(18, 7), S(44, 20) };
// ThreatByMinor/ByRook[attacked PieceType] contains bonuses according to
// which piece type attacks which one. Attacks on lesser pieces which are
@ -165,13 +165,13 @@ namespace {
constexpr Score MinorBehindPawn = S( 16, 0);
constexpr Score Overload = S( 13, 6);
constexpr Score PawnlessFlank = S( 19, 84);
constexpr Score RookOnPawn = S( 10, 30);
constexpr Score RookOnPawn = S( 10, 29);
constexpr Score SliderOnQueen = S( 42, 21);
constexpr Score ThreatByKing = S( 22, 78);
constexpr Score ThreatByPawnPush = S( 45, 40);
constexpr Score ThreatByRank = S( 16, 3);
constexpr Score ThreatBySafePawn = S(173,102);
constexpr Score TrappedRook = S( 92, 0);
constexpr Score TrappedRook = S( 96, 5);
constexpr Score WeakQueen = S( 50, 10);
constexpr Score WeakUnopposedPawn = S( 15, 19);

2
src/psqt.cpp
View file

@ -67,7 +67,7 @@ constexpr Score Bonus[][RANK_NB][int(FILE_NB) / 2] = {
{ S(-47,-55), S( -7,-32), S(-17,-36), S(-29,-17) }
},
{ // Rook
{ S(-25, 0), S(-16, 0), S(-16, 0), S(-9, 0) },
{ S(-25, 0), S(-16, 0), S(-10, 5), S( 6, 5) },
{ S(-21, 0), S( -8, 0), S( -3, 0), S( 0, 0) },
{ S(-21, 0), S( -9, 0), S( -4, 0), S( 2, 0) },
{ S(-22, 0), S( -6, 0), S( -1, 0), S( 2, 0) },