Retire ScalePawnSpan[]

[stockfish] / src / evaluate.cpp

diff --git a/src/evaluate.cpp b/src/evaluate.cpp
index c915fbfaaad9b022fd700b36841894bd5179dcb2..2161bf94c07ddf1ee53af1d0c9116a421698a4bc 100644 (file)
--- a/src/evaluate.cpp
+++ b/src/evaluate.cpp
@@ -27,7 +27,6 @@
 #include "material.h"
 #include "pawns.h"
 #include "thread.h"
-#include "uci.h"
 
 namespace {
 
@@ -199,8 +198,6 @@ namespace {
   // scores, indexed by a calculated integer number.
   Score KingDanger[128];
 
-  const int ScalePawnSpan[2] = { 38, 56 };
-
   // apply_weight() weighs score 'v' by weight 'w' trying to prevent overflow
   Score apply_weight(Score v, const Weight& w) {
     return make_score(mg_value(v) * w.mg / 256, eg_value(v) * w.eg / 256);
@@ -766,27 +763,25 @@ namespace {
     if (    ei.mi->game_phase() < PHASE_MIDGAME
         && (sf == SCALE_FACTOR_NORMAL || sf == SCALE_FACTOR_ONEPAWN))
     {
-        if (pos.opposite_bishops()) {
-            // Ignoring any pawns, do both sides only have a single bishop and no
-            // other pieces?
+        if (pos.opposite_bishops())
+        {
+            // Endgame with opposite-colored bishops and no other pieces (ignoring pawns)
+            // is almost a draw, in case of KBP vs KB is even more a draw.
             if (   pos.non_pawn_material(WHITE) == BishopValueMg
                 && pos.non_pawn_material(BLACK) == BishopValueMg)
-            {
-                // Check for KBP vs KB with only a single pawn that is almost
-                // certainly a draw or at least two pawns.
-                bool one_pawn = (pos.count<PAWN>(WHITE) + pos.count<PAWN>(BLACK) == 1);
-                sf = one_pawn ? ScaleFactor(8) : ScaleFactor(32);
-            }
+                sf = more_than_one(pos.pieces(PAWN)) ? ScaleFactor(32) : ScaleFactor(8);
+
+            // Endgame with opposite-colored bishops, but also other pieces. Still
+            // a bit drawish, but not as drawish as with only the two bishops.
             else
-                // Endgame with opposite-colored bishops, but also other pieces. Still
-                // a bit drawish, but not as drawish as with only the two bishops.
                  sf = ScaleFactor(50 * sf / SCALE_FACTOR_NORMAL);
-        } else if (    abs(eg_value(score)) <= BishopValueEg
-                   &&  ei.pi->pawn_span(strongSide) <= 1
-                   && !pos.pawn_passed(~strongSide, pos.king_square(~strongSide))) {
-            // Endings where weaker side can be place his king in front of the opponent's pawns are drawish.
-            sf = ScaleFactor(ScalePawnSpan[ei.pi->pawn_span(strongSide)]);
         }
+        // Endings where weaker side can place his king in front of the opponent's
+        // pawns are drawish.
+        else if (    abs(eg_value(score)) <= BishopValueEg
+                 &&  ei.pi->pawn_span(strongSide) <= 1
+                 && !pos.pawn_passed(~strongSide, pos.king_square(~strongSide)))
+                 sf = ei.pi->pawn_span(strongSide) ? ScaleFactor(56) : ScaleFactor(38);
     }
 
     // Interpolate between a middlegame and a (scaled by 'sf') endgame score
@@ -905,8 +900,7 @@ namespace Eval {
   }
 
 
-  /// init() computes evaluation weights from the corresponding UCI parameters
-  /// and setup king tables.
+  /// init() computes evaluation weights.
 
   void init() {