Smoother king safety

[stockfish] / src / evaluate.cpp

diff --git a/src/evaluate.cpp b/src/evaluate.cpp
index 8416162d357aa0f0d5740ea9b05f41ee652adb14..6a27108d9f4b6c3f2da3bfcc239760081142428d 100644 (file)
--- a/src/evaluate.cpp
+++ b/src/evaluate.cpp
@@ -198,7 +198,7 @@ namespace {
 
   // KingDanger[attackUnits] contains the actual king danger weighted
   // scores, indexed by a calculated integer number.
 
   // 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) {
 
   // 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.
 
         // 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)
     }
 
     if (Trace)


@@ -891,13 +891,14 @@ namespace Eval {
 
   void init() {
 
 
   void init() {
 

-    const double MaxSlope = 30;
+    const double MaxSlope = 7.5;

     const double Peak = 1280;
     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]);

     }
   }
 
     }
   }