Merge official-stockfish/master

No functional change.

diff --cc src/Makefile
Simple merge

diff --cc src/nnue/nnue_feature_transformer.h
Simple merge

diff --cc src/search.cpp
index f61dc9e,f634b2d..05284b1
--- 1/src/search.cpp
--- 2/src/search.cpp
+++ b/src/search.cpp
@@@ -1197,9 -1054,9 +1197,9 @@@ moves_loop: // When in check, search st
        // then that move is singular and should be extended. To verify this we do
        // a reduced search on all the other moves but the ttMove and if the
        // result is lower than ttValue minus a margin, then we will extend the ttMove.
-       if (    depth >= 7 - 2 * (pos.count<KING>() == 1)
+       if (   !rootNode
 -          &&  depth >= 7
++          &&  depth >= 7 - 2 * (pos.count<KING>() == 1)
            &&  move == ttMove
-           && !rootNode
            && !excludedMove // Avoid recursive singular search
         /* &&  ttValue != VALUE_NONE Already implicit in the next condition */
            &&  abs(ttValue) < VALUE_KNOWN_WIN