Bad Outpost Pawn Scale

Changed name from Bad Outpost to Uncontested Outpost
Scale Uncontested Outpost with number of pawns + Decrease Bishop PSQT values and general tuning

Credits for the decrease of the Bishop PSQT values: Fauzi
Credits for scaling Uncontested Outpost with number of pawns: Lolligerhans
Credits for the tunings: Fauzi

Passed STC:
LLR: 2.94 (-2.94,2.94) {-0.25,1.25}
Total: 32040 W: 6593 L: 6281 D: 19166
Ptnml(0-2): 596, 3713, 7095, 4015, 601
https://tests.stockfishchess.org/tests/view/5ffa43026019e097de3ef0f2

Passed LTC:
LLR: 2.95 (-2.94,2.94) {0.25,1.25}
Total: 84376 W: 11395 L: 10950 D: 62031
Ptnml(0-2): 652, 7930, 24623, 8287, 696
https://tests.stockfishchess.org/tests/view/5ffa6e7b6019e097de3ef0fd

closes https://github.com/official-stockfish/Stockfish/pull/3296

Bench: 4287509

diff --git a/src/evaluate.cpp b/src/evaluate.cpp
index c137fab5ad53b3197a793b97a9c860f4d65408ad..76266937d56717fe047789b49857cd7f199ae350 100644 (file)
--- a/src/evaluate.cpp
+++ b/src/evaluate.cpp
@@ -225,7 +225,7 @@ namespace {
   // BishopPawns[distance from edge] contains a file-dependent penalty for pawns on
   // squares of the same color as our bishop.
   constexpr Score BishopPawns[int(FILE_NB) / 2] = {
-    S(3, 8), S(3, 9), S(1, 8), S(3, 7)
+    S(3, 8), S(3, 9), S(2, 8), S(3, 8)
   };
 
   // KingProtector[knight/bishop] contains penalty for each distance unit to own king
@@ -233,7 +233,7 @@ namespace {
 
   // Outpost[knight/bishop] contains bonuses for each knight or bishop occupying a
   // pawn protected square on rank 4 to 6 which is also safe from a pawn attack.
-  constexpr Score Outpost[] = { S(56, 34), S(31, 23) };
+  constexpr Score Outpost[] = { S(57, 38), S(31, 24) };
 
   // PassedRank[Rank] contains a bonus according to the rank of a passed pawn
   constexpr Score PassedRank[RANK_NB] = {
@@ -255,7 +255,7 @@ namespace {
   };
 
   // Assorted bonuses and penalties
-  constexpr Score BadOutpost          = S( -7, 36);
+  constexpr Score UncontestedOutpost  = S(  1, 10);
   constexpr Score BishopOnKingRing    = S( 24,  0);
   constexpr Score BishopXRayPawns     = S(  4,  5);
   constexpr Score CorneredBishop      = S( 50, 50);
@@ -428,7 +428,7 @@ namespace {
         if (Pt == BISHOP || Pt == KNIGHT)
         {
             // Bonus if the piece is on an outpost square or can reach one
-            // Reduced bonus for knights (BadOutpost) if few relevant targets
+            // Bonus for knights (UncontestedOutpost) if few relevant targets
             bb = OutpostRanks & (attackedBy[Us][PAWN] | shift<Down>(pos.pieces(PAWN)))
                               & ~pe->pawn_attacks_span(Them);
             Bitboard targets = pos.pieces(Them) & ~pos.pieces(PAWN);
@@ -437,7 +437,7 @@ namespace {
                 && bb & s & ~CenterFiles // on a side outpost
                 && !(b & targets)        // no relevant attacks
                 && (!more_than_one(targets & (s & QueenSide ? QueenSide : KingSide))))
-                score += BadOutpost;
+                score += UncontestedOutpost * popcount(pos.pieces(PAWN) & (s & QueenSide ? QueenSide : KingSide));
             else if (bb & s)
                 score += Outpost[Pt == BISHOP];
             else if (Pt == KNIGHT && bb & b & ~pos.pieces(Us))

diff --git a/src/psqt.cpp b/src/psqt.cpp
index bf87237af32112e9a0028aa6b81df078eb9a6974..e2107240770c1c2397f9bdc72213bf1990e7c5d2 100644 (file)
--- a/src/psqt.cpp
+++ b/src/psqt.cpp
@@ -43,14 +43,14 @@ constexpr Score Bonus[][RANK_NB][int(FILE_NB) / 2] = {
    { S(-201,-100), S(-83,-88), S(-56,-56), S(-26,-17) }
   },
   { // Bishop
-   { S(-53,-57), S( -5,-30), S( -8,-37), S(-23,-12) },
-   { S(-15,-37), S(  8,-13), S( 19,-17), S(  4,  1) },
-   { S( -7,-16), S( 21, -1), S( -5, -2), S( 17, 10) },
-   { S( -5,-20), S( 11, -6), S( 25,  0), S( 39, 17) },
-   { S(-12,-17), S( 29, -1), S( 22,-14), S( 31, 15) },
-   { S(-16,-30), S(  6,  6), S(  1,  4), S( 11,  6) },
-   { S(-17,-31), S(-14,-20), S(  5, -1), S(  0,  1) },
-   { S(-48,-46), S(  1,-42), S(-14,-37), S(-23,-24) }
+   { S(-37,-40), S(-4 ,-21), S( -6,-26), S(-16, -8) },
+   { S(-11,-26), S(  6, -9), S( 13,-12), S(  3,  1) },
+   { S(-5 ,-11), S( 15, -1), S( -4, -1), S( 12,  7) },
+   { S(-4 ,-14), S(  8, -4), S( 18,  0), S( 27, 12) },
+   { S(-8 ,-12), S( 20, -1), S( 15,-10), S( 22, 11) },
+   { S(-11,-21), S(  4,  4), S(  1,  3), S(  8,  4) },
+   { S(-12,-22), S(-10,-14), S(  4, -1), S(  0,  1) },
+   { S(-34,-32), S(  1,-29), S(-10,-26), S(-16,-17) }
   },
   { // Rook
    { S(-31, -9), S(-20,-13), S(-14,-10), S(-5, -9) },

diff --git a/src/search.cpp b/src/search.cpp
index 7abffb8779dda1df915c660577a6ebd9330eb559..6cc115fcf94371304aaabe328414b160e39ece66 100644 (file)
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -1233,10 +1233,10 @@ moves_loop: // When in check, search starts from here
                   r++;
 
               // Decrease/increase reduction for moves with a good/bad history (~30 Elo)
-              // If we are not in check use statScore, if we are in check 
+              // If we are not in check use statScore, if we are in check
               // use sum of main history and first continuation history with an offset
               if (ss->inCheck)
-                  r -= (thisThread->mainHistory[us][from_to(move)] 
+                  r -= (thisThread->mainHistory[us][from_to(move)]
                      + (*contHist[0])[movedPiece][to_sq(move)] - 4333) / 16384;
               else
                   r -= ss->statScore / 14884;