Smoother king safety

[stockfish] / src / evaluate.cpp

diff --git a/src/evaluate.cpp b/src/evaluate.cpp
index 1c27b29d8075728fe77dc56a2f1c805e728836f8..6a27108d9f4b6c3f2da3bfcc239760081142428d 100644 (file)
--- a/src/evaluate.cpp
+++ b/src/evaluate.cpp
@@ -19,6 +19,7 @@
 
 #include <algorithm>
 #include <cassert>
+#include <cstring>   // For std::memset
 #include <iomanip>
 #include <sstream>
 
@@ -26,7 +27,6 @@
 #include "evaluate.h"
 #include "material.h"
 #include "pawns.h"
-#include "thread.h"
 
 namespace {
 
@@ -198,7 +198,7 @@ namespace {
 
   // KingDanger[attackUnits] contains the actual king danger weighted
   // scores, indexed by a calculated integer number.
-  Score KingDanger[128];
+  Score KingDanger[512];
 
   // apply_weight() weighs score 's' by weight 'w' trying to prevent overflow
   Score apply_weight(Score s, const Weight& w) {
@@ -476,7 +476,7 @@ namespace {
 
         // Finally, extract the king danger score from the KingDanger[]
         // array and subtract the score from evaluation.
-        score -= KingDanger[std::max(std::min(attackUnits / 4, 99), 0)];
+        score -= KingDanger[std::max(std::min(attackUnits, 399), 0)];
     }
 
     if (Trace)
@@ -677,7 +677,6 @@ namespace {
 
     EvalInfo ei;
     Score score, mobility[2] = { SCORE_ZERO, SCORE_ZERO };
-    Thread* thisThread = pos.this_thread();
 
     // Initialize score by reading the incrementally updated scores included
     // in the position object (material + piece square tables).
@@ -685,7 +684,7 @@ namespace {
     score = pos.psq_score();
 
     // Probe the material hash table
-    ei.mi = Material::probe(pos, thisThread->materialTable, thisThread->endgames);
+    ei.mi = Material::probe(pos);
     score += ei.mi->imbalance();
 
     // If we have a specialized evaluation function for the current material
@@ -694,7 +693,7 @@ namespace {
         return ei.mi->evaluate(pos);
 
     // Probe the pawn hash table
-    ei.pi = Pawns::probe(pos, thisThread->pawnsTable);
+    ei.pi = Pawns::probe(pos);
     score += apply_weight(ei.pi->pawns_score(), Weights[PawnStructure]);
 
     // Initialize attack and king safety bitboards
@@ -892,13 +891,14 @@ namespace Eval {
 
   void init() {
 
-    const double MaxSlope = 30;
+    const double MaxSlope = 7.5;
     const double Peak = 1280;
+    double t = 0.0;
 
-    for (int t = 0, i = 1; i < 100; ++i)
+    for (int i = 1; i < 400; ++i)
     {
-        t = int(std::min(Peak, std::min(0.4 * i * i, t + MaxSlope)));
-        KingDanger[i] = apply_weight(make_score(t, 0), Weights[KingSafety]);
+        t = std::min(Peak, std::min(0.025 * i * i, t + MaxSlope));
+        KingDanger[i] = apply_weight(make_score(int(t), 0), Weights[KingSafety]);
     }
   }