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Outpost Endgame values

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Remove the recent rank based Outpost array by using a weighted average value
computed using a frequency analysis by rank from a large set of middle game
positions.

The higher eg values introduced by the new Outpost array (which were about
twice the previous masters) are thus preserved.

STC
http://tests.stockfishchess.org/tests/view/5dd05c870ebc5902579e1f7f
LLR: 2.96 (-2.94,2.94) [-3.00,1.00]
Total: 42466 W: 9232 L: 9151 D: 24083

LTC
http://tests.stockfishchess.org/tests/view/5dd146e342928ff08153dab1
LLR: 2.95 (-2.94,2.94) [-3.00,1.00]
Total: 66968 W: 10921 L: 10873 D: 45174

Closes https://github.com/official-stockfish/Stockfish/pull/2418

Bench: 5103360
This commit is contained in:
Alain SAVARD 2019-11-16 14:42:47 -05:00 • committed by Stéphane Nicolet
parent e0f42aa956
commit 37698b0396
1 changed files with 6 additions and 10 deletions
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16
src/evaluate.cpp
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@ -126,11 +126,6 @@ namespace {
S(0, 0), S(10, 28), S(17, 33), S(15, 41), S(62, 72), S(168, 177), S(276, 260)
};
// OutpostRank[Rank] contains a bonus according to the rank of the outpost
constexpr Score OutpostRank[RANK_NB] = {
S(0, 0), S(0, 0), S(0, 0), S(28, 18), S(30, 24), S(32, 19)
};
// Assorted bonuses and penalties
constexpr Score BishopPawns = S( 3, 7);
constexpr Score CorneredBishop = S( 50, 50);
@ -140,10 +135,11 @@ namespace {
constexpr Score KnightOnQueen = S( 16, 12);
constexpr Score LongDiagonalBishop = S( 45, 0);
constexpr Score MinorBehindPawn = S( 18, 3);
constexpr Score Outpost = S( 32, 10);
constexpr Score Outpost = S( 30, 21);
constexpr Score PassedFile = S( 11, 8);
constexpr Score PawnlessFlank = S( 17, 95);
constexpr Score RestrictedPiece = S( 7, 7);
constexpr Score ReachableOutpost = S( 32, 10);
constexpr Score RookOnQueenFile = S( 7, 6);
constexpr Score SliderOnQueen = S( 59, 18);
constexpr Score ThreatByKing = S( 24, 89);
@ -242,7 +238,7 @@ namespace {
// Init our king safety tables
Square s = make_square(clamp(file_of(ksq), FILE_B, FILE_G),
clamp(rank_of(ksq), RANK_2, RANK_7));
kingRing[Us] = s | PseudoAttacks[KING][s];
kingRing[Us] = PseudoAttacks[KING][s] | s;
kingAttackersCount[Them] = popcount(kingRing[Us] & pe->pawn_attacks(Them));
kingAttacksCount[Them] = kingAttackersWeight[Them] = 0;
@ -296,11 +292,11 @@ namespace {
{
// Bonus if piece is on an outpost square or can reach one
bb = OutpostRanks & attackedBy[Us][PAWN] & ~pe->pawn_attacks_span(Them);
if (s & bb)
score += OutpostRank[relative_rank(Us, s)] * (Pt == KNIGHT ? 2 : 1);
if (bb & s)
score += Outpost * (Pt == KNIGHT ? 2 : 1);
else if (Pt == KNIGHT && bb & b & ~pos.pieces(Us))
score += Outpost;
score += ReachableOutpost;
// Knight and Bishop bonus for being right behind a pawn
if (shift<Down>(pos.pieces(PAWN)) & s)