From: Marco Costalba <mcostalba@gmail.com>
Date: Sat, 26 Mar 2011 11:19:51 +0000 (+0100)
Subject: Retire recapture extension also for PvNode
X-Git-Url: https://git.sesse.net/?p=stockfish;a=commitdiff_plain;h=8402b403419ea995dcdd9f3033dfdbc5271f3450;hp=408fdcc93f4294a649e9df550d9ca483a38dc73a

Retire recapture extension also for PvNode

Seems that extension is useless.

After 10105 games
Mod vs Orig 1738 - 1702 - 6665  ELO +1 (+- 4)

Signed-off-by: Marco Costalba <mcostalba@gmail.com>
---

diff --git a/src/search.cpp b/src/search.cpp
index a95fa554..6c49c069 100644
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -1749,15 +1749,6 @@ split_point_start: // At split points actual search starts from here
         *dangerous = true;
     }
 
-    if (   PvNode
-        && captureOrPromotion
-        && pos.type_of_piece_on(move_to(m)) != PAWN
-        && pos.see_sign(m) >= 0)
-    {
-        result += ONE_PLY / 2;
-        *dangerous = true;
-    }
-
     return Min(result, ONE_PLY);
   }