From: Stéphane Nicolet <cassio@free.fr>
Date: Wed, 5 Oct 2016 22:00:27 +0000 (+0200)
Subject: Do not use SEE in evasion scoring
X-Git-Url: https://git.sesse.net/?p=stockfish;a=commitdiff_plain;h=1e586288ca4a0ae567c8d9b9b77e804f25fe6719;ds=sidebyside

Do not use SEE in evasion scoring

Idea by Aram Tumanian (atumanian)

STC:
LLR: 2.95 (-2.94,2.94) [-3.00,1.00]
Total: 43889 W: 7849 L: 7767 D: 28273

LTC:
LLR: 2.95 (-2.94,2.94) [-3.00,1.00]
Total: 29333 W: 3809 L: 3700 D: 21824

Bench: 6421663
---

diff --git a/src/movepick.cpp b/src/movepick.cpp
index ea587389..1ec56c2f 100644
--- a/src/movepick.cpp
+++ b/src/movepick.cpp
@@ -159,19 +159,13 @@ void MovePicker::score<QUIETS>() {
 
 template<>
 void MovePicker::score<EVASIONS>() {
-  // Try winning and equal captures ordered by MVV/LVA, then non-captures ordered
-  // by history value, then bad captures and quiet moves with a negative SEE ordered
-  // by SEE value.
+  // Try captures ordered by MVV/LVA, then non-captures ordered by history value
   const HistoryStats& history = pos.this_thread()->history;
   const FromToStats& fromTo = pos.this_thread()->fromTo;
   Color c = pos.side_to_move();
-  Value see;
 
   for (auto& m : *this)
-      if ((see = pos.see_sign(m)) < VALUE_ZERO)
-          m.value = see - HistoryStats::Max; // At the bottom
-
-      else if (pos.capture(m))
+      if (pos.capture(m))
           m.value =  PieceValue[MG][pos.piece_on(to_sq(m))]
                    - Value(type_of(pos.moved_piece(m))) + HistoryStats::Max;
       else