X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=src%2Fevaluate.cpp;h=3bd790bdf4f7f469a2fa9584eb21a556bd049455;hb=0c1f119069bf915b85126159d4865c4bcc532239;hp=9202c9ed3d861d58c5cda2b45be52b9bb6b2557a;hpb=99d914985f6ddb1ee22b232d41f17a35e1d34f89;p=stockfish

diff --git a/src/evaluate.cpp b/src/evaluate.cpp
index 9202c9ed..3bd790bd 100644
--- a/src/evaluate.cpp
+++ b/src/evaluate.cpp
@@ -174,8 +174,8 @@ namespace {
     S(-20,-12), S( 1, -8), S( 2, 10), S(  9, 10)
   };
 
-  // KingProtector[PieceType-2] * "distance to own king" determines a bonus for each piece.
-  const Score KingProtector[] = {S(-3, -5), S(-4, -3), S(-3, 0), S(-1, 1) };
+  // KingProtector[PieceType-2] contains a bonus according to distance from king
+  const Score KingProtector[] = { S(-3, -5), S(-4, -3), S(-3, 0), S(-1, 1) };
 
   // Assorted bonuses and penalties used by evaluation
   const Score MinorBehindPawn     = S( 16,  0);
@@ -291,9 +291,10 @@ namespace {
 
         int mob = popcount(b & ei.mobilityArea[Us]);
 
-        mobility[Us] += MobilityBonus[Pt-2][mob];
+        mobility[Us] += MobilityBonus[Pt - 2][mob];
 
-        score += KingProtector[Pt-2] * distance(s, pos.square<KING>(Us));
+        // Bonus for this piece as a king protector
+        score += KingProtector[Pt - 2] * distance(s, pos.square<KING>(Us));
 
         if (Pt == BISHOP || Pt == KNIGHT)
         {