Add Trevis CI support

[stockfish] / src / evaluate.cpp

diff --git a/src/evaluate.cpp b/src/evaluate.cpp
index 383d9e62f1fec595399c722c8dc59baff9938e63..f66ba58c78eb5ace99e97f1b11a9cdf23cbc82f9 100644 (file)
--- a/src/evaluate.cpp
+++ b/src/evaluate.cpp
@@ -144,8 +144,8 @@ namespace {
   // Outpost[knight/bishop][supported by pawn] contains bonuses for knights and
   // bishops outposts, bigger if outpost piece is supported by a pawn.
   const Score Outpost[][2] = {
-    { S(28, 7), S(42,11) }, // Knights
-    { S(12, 3), S(18, 5) }  // Bishops
+    { S(42,11), S(63,17) }, // Knights
+    { S(18, 5), S(27, 8) }  // Bishops
   };
 
   // Threat[defended/weak][minor/major attacking][attacked PieceType] contains
@@ -170,6 +170,12 @@ namespace {
     { V(7), V(14), V(37), V(63), V(134), V(189) }
   };
 
+  // PassedFile[File] contains a bonus according to the file of a passed pawn.
+  const Score PassedFile[] = {
+    S( 14,  13), S( 2,  5), S(-3, -4), S(-19, -14),
+    S(-19, -14), S(-3, -4), S( 2,  5), S( 14,  13)
+  };
+
   const Score ThreatenedByHangingPawn = S(40, 60);
 
   // Assorted bonuses and penalties used by evaluation
@@ -184,6 +190,7 @@ namespace {
   const Score Unstoppable        = S( 0, 20);
   const Score Hanging            = S(31, 26);
   const Score PawnAttackThreat   = S(20, 20);
+  const Score Checked            = S(20, 20);
 
   // Penalty for a bishop on a1/h1 (a8/h8 for black) which is trapped by
   // a friendly pawn on b2/g2 (b7/g7 for black). This can obviously only
@@ -296,6 +303,7 @@ namespace {
         {
             // Bonus for outpost square
             if (   relative_rank(Us, s) >= RANK_4
+                && relative_rank(Us, s) <= RANK_6
                 && !(pos.pieces(Them, PAWN) & pawn_attack_span(Us, s)))
                 score += Outpost[Pt == BISHOP][!!(ei.attackedBy[Us][PAWN] & s)];
 
@@ -439,22 +447,34 @@ namespace {
         // Enemy queen safe checks
         b = (b1 | b2) & ei.attackedBy[Them][QUEEN];
         if (b)
+        {
             attackUnits += QueenCheck * popcount<Max15>(b);
+            score -= Checked;
+        }
 
         // Enemy rooks safe checks
         b = b1 & ei.attackedBy[Them][ROOK];
         if (b)
+        {
             attackUnits += RookCheck * popcount<Max15>(b);
+            score -= Checked;
+        }
 
         // Enemy bishops safe checks
         b = b2 & ei.attackedBy[Them][BISHOP];
         if (b)
+        {
             attackUnits += BishopCheck * popcount<Max15>(b);
+            score -= Checked;
+        }
 
         // Enemy knights safe checks
         b = pos.attacks_from<KNIGHT>(ksq) & ei.attackedBy[Them][KNIGHT] & safe;
         if (b)
+        {
             attackUnits += KnightCheck * popcount<Max15>(b);
+            score -= Checked;
+        }
 
         // Finally, extract the king danger score from the KingDanger[]
         // array and subtract the score from evaluation.
@@ -638,7 +658,7 @@ namespace {
         if (pos.count<PAWN>(Us) < pos.count<PAWN>(Them))
             ebonus += ebonus / 4;
 
-        score += make_score(mbonus, ebonus);
+        score += make_score(mbonus, ebonus) + PassedFile[file_of(s)];
     }
 
     if (DoTrace)
@@ -796,6 +816,11 @@ Value Eval::evaluate(const Position& pos) {
           sf = ei.pi->pawn_span(strongSide) ? ScaleFactor(56) : ScaleFactor(38);
   }
 
+  // Scale endgame by number of pawns
+  int p = pos.count<PAWN>(WHITE) + pos.count<PAWN>(BLACK);
+  int v_eg = 1 + abs(int(eg_value(score)));
+  sf = ScaleFactor(std::max(sf / 2, sf - 7 * SCALE_FACTOR_NORMAL * (14 - p) / v_eg));
+
   // Interpolate between a middlegame and a (scaled by 'sf') endgame score
   Value v =  mg_value(score) * int(me->game_phase())
            + eg_value(score) * int(PHASE_MIDGAME - me->game_phase()) * sf / SCALE_FACTOR_NORMAL;