Simplification: use Arctan for the optimism S-curve

IIvec · snicolet · commit 82697f1193cc · 2018-03-07T22:51:31.000+01:00
This was an idea of Gontran Lemaire (gonlem), but the graphs he published did not seem accurate to me. I did my own graphs, got my own constants and here is the result: STC: LLR: 2.95 (-2.94,2.94) [-3.00,1.00] Total: 42179 W: 8704 L: 8622 D: 24853 http://tests.stockfishchess.org/tests/view/5a9db6270ebc590297cb611b LTC: LLR: 2.96 (-2.94,2.94) [-3.00,1.00] Total: 17737 W: 2702 L: 2577 D: 12458 http://tests.stockfishchess.org/tests/view/5a9eb5b20ebc590297cb61b2 Note: we are now back to 70% draw rate in selfplay mode! Bench: 5544908
diff --git a/src/search.cpp b/src/search.cpp
@@ -351,10 +351,7 @@ void Thread::search() {
               ct =  Options["Contempt"] * PawnValueEg / 100; // From centipawns
 
               // Adjust contempt based on current bestValue (dynamic contempt)
-              int sign = (bestValue > 0) - (bestValue < 0);
-              ct +=  bestValue >  500 ?  70 :
-                     bestValue < -500 ? -70 :
-                     bestValue / 10 + sign * int(std::round(3.22 * log(1 + abs(bestValue))));
+              ct += int(std::round(48 * atan(float(bestValue) / 128)));
 
               Eval::Contempt = (us == WHITE ?  make_score(ct, ct / 2)
                                             : -make_score(ct, ct / 2));
