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Merge branch 'master' into nnue-player-wip

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Bench: 4746616
This commit is contained in:
Joost VandeVondele 2020-08-04 08:03:45 +02:00
commit 97724370e7
3 changed files with 22 additions and 21 deletions
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6
src/bitboard.h
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@ -130,12 +130,6 @@ constexpr bool more_than_one(Bitboard b) {
return b & (b - 1);
}
/// Counts the occupation of the bitboard depending on the occupation of SQ_A1
/// as in `b & (1ULL << SQ_A1) ? more_than_two(b) : more_than_one(b)`
constexpr bool conditional_more_than_two(Bitboard b) {
return b & (b - 1) & (b - 2);
}
constexpr bool opposite_colors(Square s1, Square s2) {
return (s1 + rank_of(s1) + s2 + rank_of(s2)) & 1;

22
src/evaluate.cpp
View file

@ -345,13 +345,15 @@ namespace {
if (Pt == BISHOP || Pt == KNIGHT)
{
// Bonus if piece is on an outpost square or can reach one
// Bonus if the piece is on an outpost square or can reach one
// Reduced bonus for knights (BadOutpost) if few relevant targets
bb = OutpostRanks & attackedBy[Us][PAWN] & ~pe->pawn_attacks_span(Them);
Bitboard targets = pos.pieces(Them) & ~pos.pieces(PAWN);
if ( Pt == KNIGHT
&& bb & s & ~CenterFiles
&& !(b & pos.pieces(Them) & ~pos.pieces(PAWN))
&& !conditional_more_than_two(
pos.pieces(Them) & ~pos.pieces(PAWN) & (s & QueenSide ? QueenSide : KingSide)))
&& bb & s & ~CenterFiles // on a side outpost
&& !(b & targets) // no relevant attacks
&& (!more_than_one(targets & (s & QueenSide ? QueenSide : KingSide))))
score += BadOutpost;
else if (bb & s)
score += Outpost[Pt == BISHOP];
@ -612,17 +614,21 @@ namespace {
// Bonus for threats on the next moves against enemy queen
if (pos.count<QUEEN>(Them) == 1)
{
bool queenImbalance = pos.count<QUEEN>() == 1;
Square s = pos.square<QUEEN>(Them);
safe = mobilityArea[Us] & ~stronglyProtected;
safe = mobilityArea[Us]
& ~pos.pieces(Us, PAWN)
& ~stronglyProtected;
b = attackedBy[Us][KNIGHT] & attacks_bb<KNIGHT>(s);
score += KnightOnQueen * popcount(b & safe);
score += KnightOnQueen * popcount(b & safe) * (1 + queenImbalance);
b = (attackedBy[Us][BISHOP] & attacks_bb<BISHOP>(s, pos.pieces()))
| (attackedBy[Us][ROOK ] & attacks_bb<ROOK >(s, pos.pieces()));
score += SliderOnQueen * popcount(b & safe & attackedBy2[Us]);
score += SliderOnQueen * popcount(b & safe & attackedBy2[Us]) * (1 + queenImbalance);
}
if (T)

15
src/search.cpp
View file

@ -1069,7 +1069,7 @@ moves_loop: // When in check, search starts from here
// search of (alpha-s, beta-s), and just one fails high on (alpha, beta),
// then that move is singular and should be extended. To verify this we do
// a reduced search on all the other moves but the ttMove and if the
// result is lower than ttValue minus a margin then we will extend the ttMove.
// result is lower than ttValue minus a margin, then we will extend the ttMove.
if ( depth >= 6
&& move == ttMove
&& !rootNode
@ -1133,12 +1133,6 @@ moves_loop: // When in check, search starts from here
if (type_of(move) == CASTLING)
extension = 1;
// Late irreversible move extension
if ( move == ttMove
&& pos.rule50_count() > 80
&& (captureOrPromotion || type_of(movedPiece) == PAWN))
extension = 2;
// Add extension to new depth
newDepth += extension;
@ -1175,6 +1169,13 @@ moves_loop: // When in check, search starts from here
{
Depth r = reduction(improving, depth, moveCount);
// Decrease reduction at non-check cut nodes for second move at low depths
if ( cutNode
&& depth <= 10
&& moveCount <= 2
&& !ss->inCheck)
r--;
// Decrease reduction if the ttHit running average is large
if (thisThread->ttHitAverage > 473 * TtHitAverageResolution * TtHitAverageWindow / 1024)
r--;