X-Git-Url: https://git.sesse.net/?p=stockfish;a=blobdiff_plain;f=src%2Fevaluate.cpp;h=74ee58f412e2e127497be66eb7341039b8e6c3d1;hp=46ddfe5c80046933bc018bf5c26ff92ba2d8e927;hb=e5cc6f6b853c65d48d78d99b039d58750cebfc50;hpb=2f5012a3eb560049fb1a0b6977d0895b845d104e

diff --git a/src/evaluate.cpp b/src/evaluate.cpp
index 46ddfe5c..74ee58f4 100644
--- a/src/evaluate.cpp
+++ b/src/evaluate.cpp
@@ -1156,7 +1156,12 @@ namespace {
     else
       ev = apply_scale_factor(ev, sf[BLACK]);
 
-    Value result = Value(int((mv * ph + ev * (128 - ph)) / 128));
+    // Superlinear interpolator
+    int sli_ph = int(ph);
+    sli_ph -= (64 - sli_ph) / 4;
+    sli_ph = Min(PHASE_MIDGAME, Max(PHASE_ENDGAME, sli_ph)); // ceiling
+
+    Value result = Value(int((mv * sli_ph + ev * (128 - sli_ph)) / 128));
     return Value(int(result) & ~(GrainSize - 1));
   }