Tuning of assorted values

[stockfish] / src / material.cpp

diff --git a/src/material.cpp b/src/material.cpp
index ebf5adff854abc4bb6770c6547795e72c7d791c7..7e2331277d59ed8b21d40063414c3cf79ef8f50f 100644 (file)
--- a/src/material.cpp
+++ b/src/material.cpp
@@ -31,7 +31,7 @@ namespace {
   // Polynomial material imbalance parameters
 
   //                      pair  pawn knight bishop rook queen
-  const int Linear[6] = { 1852, -162, -1122, -183,  249, -154 };
+  const int Linear[6] = { 1756, -164, -1067, -160,  234, -137 };
 
   const int QuadraticOurs[][PIECE_TYPE_NB] = {
     //            OUR PIECES
@@ -199,11 +199,11 @@ Entry* probe(const Position& pos) {
   // drawish scale factor for cases such as KRKBP and KmmKm (except for KBBKN).
   if (!pos.count<PAWN>(WHITE) && npm_w - npm_b <= BishopValueMg)
       e->factor[WHITE] = uint8_t(npm_w <  RookValueMg   ? SCALE_FACTOR_DRAW :
-                                 npm_b <= BishopValueMg ? 4 : 12);
+                                 npm_b <= BishopValueMg ? 4 : 14);
 
   if (!pos.count<PAWN>(BLACK) && npm_b - npm_w <= BishopValueMg)
       e->factor[BLACK] = uint8_t(npm_b <  RookValueMg   ? SCALE_FACTOR_DRAW :
-                                 npm_w <= BishopValueMg ? 4 : 12);
+                                 npm_w <= BishopValueMg ? 4 : 14);
 
   if (pos.count<PAWN>(WHITE) == 1 && npm_w - npm_b <= BishopValueMg)
       e->factor[WHITE] = (uint8_t) SCALE_FACTOR_ONEPAWN;