From: VoyagerOne <excelgeek@gmail.com>
Date: Fri, 16 Dec 2016 16:05:34 +0000 (-0500)
Subject: Another simplification for SEE pruning
X-Git-Url: https://git.sesse.net/?p=stockfish;a=commitdiff_plain;h=8c61bbda54b0ec06cb05b89db4342d890dd21798;ds=sidebyside

Another simplification for SEE pruning

STC:
LLR: 2.96 (-2.94,2.94) [-3.00,1.00]
Total: 29310 W: 5225 L: 5118 D: 18967

LTC:
LLR: 2.95 (-2.94,2.94) [-3.00,1.00]
Total: 128454 W: 16424 L: 16442 D: 95588

Bench: 4556848
---

diff --git a/src/search.cpp b/src/search.cpp
index 1ffe1e97..ec594d20 100644
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -934,12 +934,10 @@ moves_loop: // When in check search starts from here
                   && !pos.see_ge(move, Value(-35 * lmrDepth * lmrDepth)))
                   continue;
           }
-          else if (depth < 7 * ONE_PLY && !extension)
-          {
-              Value v = -Value(400 - 100 * PvNode + 35 * depth / ONE_PLY * depth / ONE_PLY);
-              if (!pos.see_ge(move, v))
+          else if (    depth < 7 * ONE_PLY
+                   && !extension
+                   && !pos.see_ge(move, -PawnValueEg * (depth / ONE_PLY)))
                   continue;
-          }
       }
 
       // Speculative prefetch as early as possible