Don't account for Tempo in specialized endgames

The evaluation is already done by the specialized
function, don't need to add something elese later.

With this patch following positions are evaluated
correctly as draws:

8/6p1/1Pkp1p1p/2nNn2P/2P1K1P1/8/8/3B4 w - - 7
8/1k4p1/1P1p1p1p/3NnK1P/2P3P1/1n6/4B3/8 w - -

Verified it not regress with an STC test:
LLR: 3.15 (-2.94,2.94) [-3.00,1.00]
Total: 49812 W: 10095 L: 10016 D: 29701

Reported by Arjun Temurnikar.

bench: 8289983

diff --git a/src/evaluate.cpp b/src/evaluate.cpp
index b7a596efba1bfc1f9af5e50971bfae7abd4dcda6..38f2d604ce9f05ad588631531b6119be1b2b91bc 100644 (file)
--- a/src/evaluate.cpp
+++ b/src/evaluate.cpp
@@ -702,7 +702,7 @@ namespace {
     // If we have a specialized evaluation function for the current material
     // configuration, call it and return.
     if (ei.mi->specialized_eval_exists())
-        return ei.mi->evaluate(pos) + Eval::Tempo;
+        return ei.mi->evaluate(pos);
 
     // Probe the pawn hash table
     ei.pi = Pawns::probe(pos, thisThread->pawnsTable);