mirror of
https://github.com/sockspls/badfish
synced 2025-07-12 12:09:14 +00:00
af110e02ec
since the introduction of NNUE (first released with Stockfish 12), we have maintained the classical evaluation as part of SF in frozen form. The idea that this code could lead to further inputs to the NN or search did not materialize. Now, after five releases, this PR removes the classical evaluation from SF. Even though this evaluation is probably the best of its class, it has become unimportant for the engine's strength, and there is little need to maintain this code (roughly 25% of SF) going forward, or to expend resources on trying to improve its integration in the NNUE eval. Indeed, it had still a very limited use in the current SF, namely for the evaluation of positions that are nearly decided based on material difference, where the speed of the classical evaluation outweights its inaccuracies. This impact on strength is small, roughly 2Elo, and probably decreasing in importance as the TC grows. Potentially, removal of this code could lead to the development of techniques to have faster, but less accurate NN evaluation, for certain positions. STC https://tests.stockfishchess.org/tests/view/64a320173ee09aa549c52157 Elo: -2.35 ± 1.1 (95%) LOS: 0.0% Total: 100000 W: 24916 L: 25592 D: 49492 Ptnml(0-2): 287, 12123, 25841, 11477, 272 nElo: -4.62 ± 2.2 (95%) PairsRatio: 0.95 LTC https://tests.stockfishchess.org/tests/view/64a320293ee09aa549c5215b Elo: -1.74 ± 1.0 (95%) LOS: 0.0% Total: 100000 W: 25010 L: 25512 D: 49478 Ptnml(0-2): 44, 11069, 28270, 10579, 38 nElo: -3.72 ± 2.2 (95%) PairsRatio: 0.96 VLTC SMP https://tests.stockfishchess.org/tests/view/64a3207c3ee09aa549c52168 Elo: -1.70 ± 0.9 (95%) LOS: 0.0% Total: 100000 W: 25673 L: 26162 D: 48165 Ptnml(0-2): 8, 9455, 31569, 8954, 14 nElo: -3.95 ± 2.2 (95%) PairsRatio: 0.95 closes https://github.com/official-stockfish/Stockfish/pull/4674 Bench: 1444646
50 lines
1.3 KiB
C++
50 lines
1.3 KiB
C++
/*
|
|
Stockfish, a UCI chess playing engine derived from Glaurung 2.1
|
|
Copyright (C) 2004-2023 The Stockfish developers (see AUTHORS file)
|
|
|
|
Stockfish is free software: you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation, either version 3 of the License, or
|
|
(at your option) any later version.
|
|
|
|
Stockfish is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#include <iostream>
|
|
|
|
#include "bitboard.h"
|
|
#include "position.h"
|
|
#include "psqt.h"
|
|
#include "search.h"
|
|
#include "syzygy/tbprobe.h"
|
|
#include "thread.h"
|
|
#include "tt.h"
|
|
#include "uci.h"
|
|
|
|
using namespace Stockfish;
|
|
|
|
int main(int argc, char* argv[]) {
|
|
|
|
std::cout << engine_info() << std::endl;
|
|
|
|
CommandLine::init(argc, argv);
|
|
UCI::init(Options);
|
|
Tune::init();
|
|
PSQT::init();
|
|
Bitboards::init();
|
|
Position::init();
|
|
Threads.set(size_t(Options["Threads"]));
|
|
Search::clear(); // After threads are up
|
|
Eval::NNUE::init();
|
|
|
|
UCI::loop(argc, argv);
|
|
|
|
Threads.set(0);
|
|
return 0;
|
|
}
|