Document Threat[] indices

From Marco's repo.

No functional change.

diff --git a/src/evaluate.cpp b/src/evaluate.cpp
index 4f99eb870e5fc712ea7121fb6d042407a711c793..9a55fbd88789a5096731061fb66d4109591cf8b6 100644 (file)
--- a/src/evaluate.cpp
+++ b/src/evaluate.cpp
@@ -498,6 +498,7 @@ namespace {
 
     Bitboard b, weakEnemies, protectedEnemies;
     Score score = SCORE_ZERO;
 
     Bitboard b, weakEnemies, protectedEnemies;
     Score score = SCORE_ZERO;

+    enum { Minor, Major };

 
     // Protected enemies
     protectedEnemies = (pos.pieces(Them) ^ pos.pieces(Them,PAWN))
 
     // Protected enemies
     protectedEnemies = (pos.pieces(Them) ^ pos.pieces(Them,PAWN))


@@ -505,7 +506,7 @@ namespace {
                       & (ei.attackedBy[Us][KNIGHT] | ei.attackedBy[Us][BISHOP]);
 
     if(protectedEnemies)
                       & (ei.attackedBy[Us][KNIGHT] | ei.attackedBy[Us][BISHOP]);
 
     if(protectedEnemies)

-        score += Threat[0][type_of(pos.piece_on(lsb(protectedEnemies)))];
+        score += Threat[Minor][type_of(pos.piece_on(lsb(protectedEnemies)))];

 
     // Enemies not defended by a pawn and under our attack
     weakEnemies =  pos.pieces(Them)
 
     // Enemies not defended by a pawn and under our attack
     weakEnemies =  pos.pieces(Them)


@@ -517,11 +518,11 @@ namespace {
     {
         b = weakEnemies & (ei.attackedBy[Us][KNIGHT] | ei.attackedBy[Us][BISHOP]);
         if (b)
     {
         b = weakEnemies & (ei.attackedBy[Us][KNIGHT] | ei.attackedBy[Us][BISHOP]);
         if (b)

-            score += Threat[0][type_of(pos.piece_on(lsb(b)))];
+            score += Threat[Minor][type_of(pos.piece_on(lsb(b)))];

 
         b = weakEnemies & (ei.attackedBy[Us][ROOK] | ei.attackedBy[Us][QUEEN]);
         if (b)
 
         b = weakEnemies & (ei.attackedBy[Us][ROOK] | ei.attackedBy[Us][QUEEN]);
         if (b)

-            score += Threat[1][type_of(pos.piece_on(lsb(b)))];
+            score += Threat[Major][type_of(pos.piece_on(lsb(b)))];

 
         b = weakEnemies & ~ei.attackedBy[Them][ALL_PIECES];
         if (b)
 
         b = weakEnemies & ~ei.attackedBy[Them][ALL_PIECES];
         if (b)