Tweak the connected[] array value for pawns on rank 5

snicolet · snicolet · commit d4cb80b2106e · 2018-05-03T22:00:07.000+02:00
A recent tuning session by Jerry Donald Watson suggested that the value for the pawns on the fifth rank in the connected[] array were a little bit too high in master. We lower here this value from 75 to 65. STC: LLR: 2.95 (-2.94,2.94) [0.00,4.00] Total: 27399 W: 5646 L: 5384 D: 16369 http://tests.stockfishchess.org/tests/view/5aea17c50ebc5902a1bed396 LTC: LLR: 3.66 (-2.94,2.94) [0.00,4.00] Total: 95590 W: 14529 L: 14062 D: 66999 http://tests.stockfishchess.org/tests/view/5aea34a40ebc5902a104ebe5 Closes #1580 Bench: 5186783
diff --git a/src/pawns.cpp b/src/pawns.cpp
@@ -179,7 +179,7 @@ namespace Pawns {
 
 void init() {
 
-  static constexpr int Seed[RANK_NB] = { 0, 13, 24, 18, 76, 100, 175, 330 };
+  static constexpr int Seed[RANK_NB] = { 0, 13, 24, 18, 65, 100, 175, 330 };
 
   for (int opposed = 0; opposed <= 1; ++opposed)
       for (int phalanx = 0; phalanx <= 1; ++phalanx)
