X-Git-Url: https://git.sesse.net/?p=stockfish;a=blobdiff_plain;f=src%2Fpsqt.cpp;fp=src%2Fpsqt.cpp;h=bc3e53928cb25faa6874acaf6f3cebb8845ad9df;hp=a4a5e0a04dc60ef50840da1ec80ebb23e9908cb5;hb=eb6d7f537d214c4dc8bde7d4fdc2aaead47dd3c3;hpb=79c97625a42c131708af953839900aff31102454

diff --git a/src/psqt.cpp b/src/psqt.cpp
index a4a5e0a0..bc3e5392 100644
--- a/src/psqt.cpp
+++ b/src/psqt.cpp
@@ -90,15 +90,15 @@ constexpr Score Bonus[][RANK_NB][int(FILE_NB) / 2] = {
   }
 };
 
-constexpr Score PBonus[RANK_NB][FILE_NB] =
-  { // Pawn
-   { S(  0,  0), S(  0,  0), S(  0,  0), S(  0,  0), S(  0,  0), S(  0,  0), S(  0,  0), S(  0,  0) },
-   { S(  0,-11), S( -3, -4), S( 13, -1), S( 19, -4), S( 16, 17), S( 13,  7), S(  4,  4), S( -4,-13) },
-   { S(-16, -8), S(-12, -6), S( 20, -3), S( 21,  0), S( 25,-11), S( 29,  3), S(  0,  0), S(-27, -1) },
-   { S(-11,  3), S(-17,  6), S( 11,-10), S( 21,  1), S( 32, -6), S( 19,-11), S( -5,  0), S(-14, -2) },
-   { S(  4, 13), S(  6,  7), S( -8,  3), S(  3, -5), S(  8,-15), S( -2, -1), S(-19,  9), S( -5, 13) },
-   { S( -5, 25), S(-19, 20), S(  7, 16), S(  8, 12), S( -7, 21), S( -2,  3), S(-10, -4), S(-16, 15) },
-   { S(-10,  6), S(  9, -5), S( -7, 16), S(-12, 27), S( -7, 15), S( -8, 11), S( 16, -7), S( -8,  4) }
+constexpr Score PBonus[RANK_NB][FILE_NB] =
+  { // Pawn (asymmetric distribution)
+   { },
+   { S(  0,-11), S( -3,-4), S(13, -1), S( 19, -4), S(16, 17), S(13,  7), S(  4,  4), S( -4,-13) },
+   { S(-16, -8), S(-12,-6), S(20, -3), S( 21,  0), S(25,-11), S(29,  3), S(  0,  0), S(-27, -1) },
+   { S(-11,  3), S(-17, 6), S(11,-10), S( 21,  1), S(32, -6), S(19,-11), S( -5,  0), S(-14, -2) },
+   { S(  4, 13), S(  6, 7), S(-8,  3), S(  3, -5), S( 8,-15), S(-2, -1), S(-19,  9), S( -5, 13) },
+   { S( -5, 25), S(-19,20), S( 7, 16), S(  8, 12), S(-7, 21), S(-2,  3), S(-10, -4), S(-16, 15) },
+   { S(-10,  6), S(  9,-5), S(-7, 16), S(-12, 27), S(-7, 15), S(-8, 11), S( 16, -7), S( -8,  4) }
   };
 
 #undef S