X-Git-Url: https://git.sesse.net/?p=stockfish;a=blobdiff_plain;f=src%2Fpawns.cpp;h=7edaa6e1bb786bfa42ff341352f3d153b280e417;hp=7eb584d2e8f37c5c8e49b507515bc7ba2c0657d5;hb=49a1fdd3fe894d170a2c2781238c0f0f907c08cc;hpb=ea5505821dabb70eb01cc25f7b4489b0fdc17d2b
diff --git a/src/pawns.cpp b/src/pawns.cpp
index 7eb584d2..7edaa6e1 100644
--- a/src/pawns.cpp
+++ b/src/pawns.cpp
@@ -18,7 +18,6 @@
along with this program. If not, see .
*/
-#include
#include
#include "bitboard.h"
@@ -36,8 +35,8 @@ namespace {
constexpr Score Doubled = S(11, 56);
constexpr Score Isolated = S( 5, 15);
- // Connected pawn bonus by opposed, phalanx, #support and rank
- Score Connected[2][2][3][RANK_NB];
+ // Connected pawn bonus
+ constexpr int Connected[RANK_NB] = { 0, 13, 24, 18, 65, 100, 175, 330 };
// Strength of pawn shelter for our king by [distance from edge][rank].
// RANK_1 = 0 is used for files where we have no pawn, or pawn is behind our king.
@@ -118,7 +117,7 @@ namespace {
&& popcount(phalanx) >= popcount(leverPush))
e->passedPawns[Us] |= s;
- else if ( stoppers == SquareBB[s + Up]
+ else if ( stoppers == square_bb(s + Up)
&& relative_rank(Us, s) >= RANK_5)
{
b = shift(support) & ~theirPawns;
@@ -129,8 +128,12 @@ namespace {
// Score this pawn
if (support | phalanx)
- score += Connected[opposed][bool(phalanx)][popcount(support)][relative_rank(Us, s)];
-
+ {
+ int r = relative_rank(Us, s);
+ int v = phalanx ? Connected[r] + Connected[r + 1] : 2 * Connected[r];
+ v = 17 * popcount(support) + (v >> (opposed + 1));
+ score += make_score(v, v * (r - 2) / 4);
+ }
else if (!neighbours)
score -= Isolated, e->weakUnopposed[Us] += !opposed;
@@ -148,27 +151,6 @@ namespace {
namespace Pawns {
-/// Pawns::init() initializes some tables needed by evaluation. Instead of using
-/// hard-coded tables, when makes sense, we prefer to calculate them with a formula
-/// to reduce independent parameters and to allow easier tuning and better insight.
-
-void init() {
-
- static constexpr int Seed[RANK_NB] = { 0, 13, 24, 18, 65, 100, 175, 330 };
-
- for (int opposed = 0; opposed <= 1; ++opposed)
- for (int phalanx = 0; phalanx <= 1; ++phalanx)
- for (int support = 0; support <= 2; ++support)
- for (Rank r = RANK_2; r < RANK_8; ++r)
- {
- int v = 17 * support;
- v += (Seed[r] + (phalanx ? (Seed[r + 1] - Seed[r]) / 2 : 0)) >> opposed;
-
- Connected[opposed][phalanx][support][r] = make_score(v, v * (r - 2) / 4);
- }
-}
-
-
/// Pawns::probe() looks up the current position's pawns configuration in
/// the pawns hash table. It returns a pointer to the Entry if the position
/// is found. Otherwise a new Entry is computed and stored there, so we don't
@@ -185,8 +167,7 @@ Entry* probe(const Position& pos) {
e->key = key;
e->scores[WHITE] = evaluate(pos, e);
e->scores[BLACK] = evaluate(pos, e);
- e->asymmetry = popcount( (e->passedPawns[WHITE] | e->passedPawns[BLACK])
- | (e->semiopenFiles[WHITE] ^ e->semiopenFiles[BLACK]));
+ e->passedCount= popcount(e->passedPawns[WHITE] | e->passedPawns[BLACK]);
return e;
}
@@ -209,7 +190,7 @@ Value Entry::evaluate_shelter(const Position& pos, Square ksq) {
Value safety = (shift(theirPawns) & (FileABB | FileHBB) & BlockRanks & ksq) ?
Value(374) : Value(5);
- File center = std::max(FILE_B, std::min(FILE_G, file_of(ksq)));
+ File center = clamp(file_of(ksq), FILE_B, FILE_G);
for (File f = File(center - 1); f <= File(center + 1); ++f)
{
b = ourPawns & file_bb(f);