Dumb stockfish

[Fulvio]

Ispired by the thread "Expected CCRL ELO strength of a barebones chess engine?" I would like to see how strong is Stockfish without any evaluation.
I have changed the evaluate function to:

Code: Select all

Value Eval::evaluate(Position& pos) {
    const int my_moves = (int) MoveList<LEGAL>(pos).size();
    StateInfo newSt;
    pos.do_null_move(newSt);
    const int adv_moves = (int) MoveList<LEGAL>(pos).size();
    pos.undo_null_move();
    auto res = Value(my_moves - adv_moves);
    return res;
}

but it is still too strong and I imagine there are other evaluate functions somewhere else.
Suggestions?

[Damir]

Try and disable Lc0 networks and see how strong Lc0 really is....

[MikeB]

Ispired by the thread "Expected CCRL ELO strength of a barebones chess engine?" I would like to see how strong is Stockfish without any evaluation.
I have changed the evaluate function to:

Code: Select all

Value Eval::evaluate(Position& pos) {
    const int my_moves = (int) MoveList<LEGAL>(pos).size();
    StateInfo newSt;
    pos.do_null_move(newSt);
    const int adv_moves = (int) MoveList<LEGAL>(pos).size();
    pos.undo_null_move();
    auto res = Value(my_moves - adv_moves);
    return res;
}

but it is still too strong and I imagine there are other evaluate functions somewhere else.
Suggestions?

The Stockfish search , in some respects , is more notable than the evaluate function. Take a look at the "#ifdef Weakfish" lines in search.cpp, The Weakfish defines takes it down 500-600 Elo ( to about 2900-3000 ).

https://github.com/MichaelB7/Stockfish/tree/honey

Also looks at piece value in types.h , psqt.cpp, material.cpp and pawns.cpp. You might have to be careful since I am sure some of them roll into evaluate at some point.

[Dann Corbit]

I believe it was Christophe Theron who first said, "Search is also knowledge."