Pawns Tuning

A simple tuning of Pawns parameters, and some PSQT changes.

Passed STC:
LLR: 2.94 (-2.94,2.94) {-0.25,1.25}
Total: 219424 W: 43681 L: 43103 D: 132640
Ptnml(0-2): 4014, 25760, 49669, 26172, 4097
https://tests.stockfishchess.org/tests/view/601bce167f517a561bc491eb

Passed LTC:
LLR: 2.94 (-2.94,2.94) {0.25,1.25}
Total: 317312 W: 42525 L: 41579 D: 233208
Ptnml(0-2): 2447, 30157, 92636, 30835, 2581
https://tests.stockfishchess.org/tests/view/601c21557f517a561bc49227

closes https://github.com/official-stockfish/Stockfish/pull/3337

Bench: 4154473

diff --git a/src/pawns.cpp b/src/pawns.cpp
index 5d6770ed76eafb88bcd871a790f45c289a0b1e0a..cd4d4e45212568ec7e8cefeffd6a4a420dbefc06 100644 (file)
--- a/src/pawns.cpp
+++ b/src/pawns.cpp
@@ -30,22 +30,22 @@ namespace {
   #define S(mg, eg) make_score(mg, eg)
 
   // Pawn penalties
   #define S(mg, eg) make_score(mg, eg)
 
   // Pawn penalties

-  constexpr Score Backward      = S( 6, 23);
-  constexpr Score Doubled       = S(13, 53);
-  constexpr Score DoubledEarly  = S(20, 10);
-  constexpr Score Isolated      = S( 2, 15);
-  constexpr Score WeakLever     = S( 5, 57);
-  constexpr Score WeakUnopposed = S(16, 22);
+  constexpr Score Backward      = S( 9, 22);
+  constexpr Score Doubled       = S(13, 51);
+  constexpr Score DoubledEarly  = S(20,  7);
+  constexpr Score Isolated      = S( 3, 15);
+  constexpr Score WeakLever     = S( 4, 58);
+  constexpr Score WeakUnopposed = S(13, 24);

 
   // Bonus for blocked pawns at 5th or 6th rank
 
   // Bonus for blocked pawns at 5th or 6th rank

-  constexpr Score BlockedPawn[2] = { S(-15, -3), S(-6, 3) };
+  constexpr Score BlockedPawn[2] = { S(-17, -6), S(-9, 2) };

 
   constexpr Score BlockedStorm[RANK_NB] = {
     S(0, 0), S(0, 0), S(75, 78), S(-8, 16), S(-6, 10), S(-6, 6), S(0, 2)
   };
 
   // Connected pawn bonus
 
   constexpr Score BlockedStorm[RANK_NB] = {
     S(0, 0), S(0, 0), S(75, 78), S(-8, 16), S(-6, 10), S(-6, 6), S(0, 2)
   };
 
   // Connected pawn bonus

-  constexpr int Connected[RANK_NB] = { 0, 5, 7, 11, 24, 48, 86 };
+  constexpr int Connected[RANK_NB] = { 0, 5, 7, 11, 23, 48, 87 };

 
   // Strength of pawn shelter for our king by [distance from edge][rank].
   // RANK_1 = 0 is used for files where we have no pawn, or pawn is behind our king.
 
   // Strength of pawn shelter for our king by [distance from edge][rank].
   // RANK_1 = 0 is used for files where we have no pawn, or pawn is behind our king.

diff --git a/src/psqt.cpp b/src/psqt.cpp
index 46605d52d4752c1acf86d2f93f4b9c506305960b..cfade2951ff9b5d53aa7a4b8b681433f9401a973 100644 (file)
--- a/src/psqt.cpp
+++ b/src/psqt.cpp
@@ -67,13 +67,13 @@ constexpr Score Bonus[][RANK_NB][int(FILE_NB) / 2] = {
   },
   { // Queen
    { S( 3,-69), S(-5,-57), S(-5,-47), S( 4,-26) },
   },
   { // Queen
    { S( 3,-69), S(-5,-57), S(-5,-47), S( 4,-26) },

-   { S(-3,-55), S( 5,-31), S( 8,-22), S(12, -4) },
+   { S(-3,-54), S( 5,-31), S( 8,-22), S(12, -4) },

    { S(-3,-39), S( 6,-18), S(13, -9), S( 7,  3) },
    { S( 4,-23), S( 5, -3), S( 9, 13), S( 8, 24) },
    { S( 0,-29), S(14, -6), S(12,  9), S( 5, 21) },
    { S(-3,-39), S( 6,-18), S(13, -9), S( 7,  3) },
    { S( 4,-23), S( 5, -3), S( 9, 13), S( 8, 24) },
    { S( 0,-29), S(14, -6), S(12,  9), S( 5, 21) },

-   { S(-4,-38), S(10,-18), S( 6,-12), S( 8,  1) },
+   { S(-4,-38), S(10,-18), S( 6,-11), S( 8,  1) },

    { S(-5,-50), S( 6,-27), S(10,-24), S( 8, -8) },
    { S(-5,-50), S( 6,-27), S(10,-24), S( 8, -8) },

-   { S(-2,-75), S(-2,-52), S( 1,-43), S(-2,-36) }
+   { S(-2,-74), S(-2,-52), S( 1,-43), S(-2,-34) }

   },
   { // King
    { S(271,  1), S(327, 45), S(271, 85), S(198, 76) },
   },
   { // King
    { S(271,  1), S(327, 45), S(271, 85), S(198, 76) },


@@ -90,12 +90,12 @@ constexpr Score Bonus[][RANK_NB][int(FILE_NB) / 2] = {
 constexpr Score PBonus[RANK_NB][FILE_NB] =
   { // Pawn (asymmetric distribution)
    { },
 constexpr Score PBonus[RANK_NB][FILE_NB] =
   { // Pawn (asymmetric distribution)
    { },

-   { S(  3,-10), S(  3, -6), S( 10, 10), S( 19,  0), S( 16, 14), S( 19,  7), S(  7, -5), S( -5,-19) },
-   { S( -9,-10), S(-15,-10), S( 11,-10), S( 15,  4), S( 32,  4), S( 22,  3), S(  5, -6), S(-22, -4) },
-   { S( -4,  6), S(-23, -2), S(  6, -8), S( 20, -4), S( 40,-13), S( 17,-12), S(  4,-10), S( -8, -9) },
-   { S( 13, 10), S(  0,  5), S(-13,  4), S(  1, -5), S( 11, -5), S( -2, -5), S(-13, 14), S(  5,  9) },
-   { S(  5, 28), S(-12, 20), S( -7, 21), S( 22, 28), S( -8, 30), S( -5,  7), S(-15,  6), S( -8, 13) },
-   { S( -7,  0), S(  7,-11), S( -3, 12), S(-13, 21), S(  5, 25), S(-16, 19), S( 10,  4), S( -8,  7) }
+   { S(  2, -8), S(  4, -6), S( 11,  9), S( 18,  5), S( 16, 16), S( 21,  6), S(  9, -6), S( -3,-18) },
+   { S( -9, -9), S(-15, -7), S( 11,-10), S( 15,  5), S( 31,  2), S( 23,  3), S(  6, -8), S(-20, -5) },
+   { S( -3,  7), S(-20,  1), S(  8, -8), S( 19, -2), S( 39,-14), S( 17,-13), S(  2,-11), S( -5, -6) },
+   { S( 11, 12), S( -4,  6), S(-11,  2), S(  2, -6), S( 11, -5), S(  0, -4), S(-12, 14), S(  5,  9) },
+   { S(  3, 27), S(-11, 18), S( -6, 19), S( 22, 29), S( -8, 30), S( -5,  9), S(-14,  8), S(-11, 14) },
+   { S( -7, -1), S(  6,-14), S( -2, 13), S(-11, 22), S(  4, 24), S(-14, 17), S( 10,  7), S( -9,  7) }

   };
 
 } // namespace
   };
 
 } // namespace