From: Stéphane Nicolet <cassio@free.fr>
Date: Mon, 2 Jan 2017 08:33:40 +0000 (+0100)
Subject: Simplify unstoppable again (#950)
X-Git-Url: https://git.sesse.net/?p=stockfish;a=commitdiff_plain;h=e3a8b8bcff893d078e219637b3d0dcaeaa04beb2;ds=sidebyside

Simplify unstoppable again (#950)

Assign a small bonus for our passed pawns when the opponent has no
pieces left.

STC:
LLR: 2.95 (-2.94,2.94) [-3.00,1.00]
Total: 51124 W: 9036 L: 8966 D: 33122

LTC:
LLR: 2.95 (-2.94,2.94) [-3.00,1.00]
Total: 114560 W: 14604 L: 14604 D: 85352

Bench: 4940355
---

diff --git a/src/evaluate.cpp b/src/evaluate.cpp
index ed43ce7f..af7a9d34 100644
--- a/src/evaluate.cpp
+++ b/src/evaluate.cpp
@@ -672,8 +672,8 @@ namespace {
                 mbonus += rr + r * 2, ebonus += rr + r * 2;
         } // rr != 0
 
-        // Assign a small bonus when no pieces left (unstoppable)
-        if (!pos.non_pawn_material(Us) && !pos.non_pawn_material(Them))
+        // Assign a small bonus when the opponent has no pieces left
+        if (!pos.non_pawn_material(Them))
             ebonus += 20;
 
         score += make_score(mbonus, ebonus) + PassedFile[file_of(s)];