From: Marco Costalba <mcostalba@gmail.com>
Date: Tue, 2 Jul 2013 05:24:17 +0000 (+0200)
Subject: Entering a pawn endgame is no more dangerous
X-Git-Url: https://git.sesse.net/?p=stockfish;a=commitdiff_plain;h=2d82db1d14631de38d158f16e31f374147bcfd6a

Entering a pawn endgame is no more dangerous

A simplification of the 'dangerous' definition.

Seems neutral at reverse test at long TC

master vs patch
LLR: -2.96 (-2.94,2.94)
Total: 16974 W: 3122 L: 3139 D: 10713

bench: 4689029
---

diff --git a/src/search.cpp b/src/search.cpp
index bf33a136..e1b7a1d7 100644
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -820,12 +820,7 @@ split_point_start: // At split points actual search starts from here
       givesCheck = pos.move_gives_check(move, ci);
       dangerous =   givesCheck
                  || pos.is_passed_pawn_push(move)
-                 || type_of(move) == CASTLE
-                 || (   captureOrPromotion // Entering a pawn endgame?
-                     && type_of(pos.piece_on(to_sq(move))) != PAWN
-                     && type_of(move) == NORMAL
-                     && (  pos.non_pawn_material(WHITE) + pos.non_pawn_material(BLACK)
-                         - PieceValue[MG][pos.piece_on(to_sq(move))] == VALUE_ZERO));
+                 || type_of(move) == CASTLE;
 
       // Step 12. Extend checks and, in PV nodes, also dangerous moves
       if (PvNode && dangerous)