Cap space evaluation bonus

When computing space evaluation, limit the bonus square count to 16.

STC @ 10+0.1 th 1:
LLR: 2.97 (-2.94,2.94) [0.00,5.00]
Total: 30793 W: 5910 L: 5648 D: 19235

LTC @ 60+0.6 th 1:
LLR: 2.96 (-2.94,2.94) [0.00,5.00]
Total: 31361 W: 4410 L: 4184 D: 22767

Bench: 7165385

diff --git a/src/evaluate.cpp b/src/evaluate.cpp
index 84a37dfcfe8fd356f189011271e220b2a47fc008..d3ddfd510bad2e51a92ce991386bbcb135de2738 100644 (file)
--- a/src/evaluate.cpp
+++ b/src/evaluate.cpp
@@ -703,9 +703,10 @@ namespace {
 
     // ...count safe + (behind & safe) with a single popcount
     int bonus = popcount((Us == WHITE ? safe << 32 : safe >> 32) | (behind & safe));
 
     // ...count safe + (behind & safe) with a single popcount
     int bonus = popcount((Us == WHITE ? safe << 32 : safe >> 32) | (behind & safe));

+    bonus = std::min(16, bonus);

     int weight = pos.count<ALL_PIECES>(Us);
 
     int weight = pos.count<ALL_PIECES>(Us);
 

-    return make_score(bonus * weight * weight  / 22, 0);
+    return make_score(bonus * weight * weight / 22, 0);

   }
 
 
   }