X-Git-Url: https://git.sesse.net/?p=stockfish;a=blobdiff_plain;f=src%2Fevaluate.cpp;fp=src%2Fevaluate.cpp;h=27fcd47763060dd260812124b2b9bffb7ca4a491;hp=e7d30825e298f8f5c199f9d86cd9fb405e7c814e;hb=de4e1cb88d9d5a6b4bf6e47bdc2a71e025bf8f46;hpb=56d5504f6548b69ce6faaa271a8b55f3773db70c

diff --git a/src/evaluate.cpp b/src/evaluate.cpp
index e7d30825..27fcd477 100644
--- a/src/evaluate.cpp
+++ b/src/evaluate.cpp
@@ -705,6 +705,9 @@ namespace {
     int outflanking =  distance<File>(pos.square<KING>(WHITE), pos.square<KING>(BLACK))
                      - distance<Rank>(pos.square<KING>(WHITE), pos.square<KING>(BLACK));
 
+    bool infiltration =   rank_of(pos.square<KING>(WHITE)) > RANK_4
+                       || rank_of(pos.square<KING>(BLACK)) < RANK_5;
+
     bool pawnsOnBothFlanks =   (pos.pieces(PAWN) & QueenSide)
                             && (pos.pieces(PAWN) & KingSide);
 
@@ -716,10 +719,11 @@ namespace {
     int complexity =   9 * pe->passed_count()
                     + 11 * pos.count<PAWN>()
                     +  9 * outflanking
+                    + 12 * infiltration
                     + 21 * pawnsOnBothFlanks
                     + 51 * !pos.non_pawn_material()
                     - 43 * almostUnwinnable
-                    - 95 ;
+                    - 100 ;
 
     // Now apply the bonus: note that we find the attacking side by extracting the
     // sign of the midgame or endgame values, and that we carefully cap the bonus