Remove Capture Extension

This revert the patch #3692, probably can be simplified after the introduction of #3838.

Fixed-game test:
ELO: -1.41 +-1.8 (95%) LOS: 5.9%
Total: 20000 W: 1552 L: 1633 D: 16815
Ptnml(0-2): 38, 1242, 7517, 1169, 34
https://tests.stockfishchess.org/tests/view/61bc1a2057a0d0f327c32a3c

STC:
LLR: 2.94 (-2.94,2.94) <-2.25,0.25>
Total: 44528 W: 11619 L: 11478 D: 21431
Ptnml(0-2): 146, 5020, 11771, 5201, 126
https://tests.stockfishchess.org/tests/view/61bc638c57a0d0f327c338fe

LTC:
LLR: 2.94 (-2.94,2.94) <-2.25,0.25>
Total: 34136 W: 8847 L: 8704 D: 16585
Ptnml(0-2): 23, 3475, 9925, 3626, 19
https://tests.stockfishchess.org/tests/view/61bcb24257a0d0f327c34813

closes https://github.com/official-stockfish/Stockfish/pull/3863

Bench: 4054695

diff --git a/src/search.cpp b/src/search.cpp
index d2ceee9fd1a15823bf6937e13873a3f626248bf3..eb0ac5bbd02c856c2a9d85989af21f22eafcacf5 100644 (file)
--- a/src/search.cpp
+++ b/src/search.cpp
@@ -1123,12 +1123,6 @@ moves_loop: // When in check, search starts here
               extension = -2;
       }
 
-      // Capture extensions for PvNodes and cutNodes
-      else if (   (PvNode || cutNode)
-               && captureOrPromotion
-               && moveCount != 1)
-          extension = 1;
-
       // Check extensions
       else if (   givesCheck
                && depth > 6