From: Stefano80 <stefano.cardanobile@gmail.com>
Date: Mon, 17 Apr 2017 16:17:41 +0000 (-0700)
Subject: Remove cap from space score contribution and increase bonus
X-Git-Url: https://git.sesse.net/?p=stockfish;a=commitdiff_plain;h=06175c6055400dca1bbeef20956f35938046d104

Remove cap from space score contribution and increase bonus

STC
LLR: 2.96 (-2.94,2.94) [-3.00,1.00]
Total: 58462 W: 10615 L: 10558 D: 37289

LTC
LLR: 2.95 (-2.94,2.94) [-3.00,1.00]
Total: 65061 W: 8539 L: 8477 D: 48045

It is worth noting that an attempt to only increase the bonus passed STC but failed LTC, and
an attempt to remove the cap without increasing the bonus is still running at STC, but will probably fail after more than 100k.

Bench: 6188591

Closes #1063
---

diff --git a/src/evaluate.cpp b/src/evaluate.cpp
index a4b3c338..23ab62ec 100644
--- a/src/evaluate.cpp
+++ b/src/evaluate.cpp
@@ -720,10 +720,9 @@ namespace {
 
     // ...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) - 2 * ei.pe->open_files();
 
-    return make_score(bonus * weight * weight / 18, 0);
+    return make_score(bonus * weight * weight / 16, 0);
   }