whatever the level, it is very weak, as one is able to beat it even at level 8.tomitank wrote:Hi!
I found this:
https://github.com/niklasf/stockfish.js
This is used by "lichess".
My question is: what parameter does the "lichess" use to set engine level?
-Tamas
that will depend on the computers.tomitank wrote:That's okay.
I'm interested, for example, at level 7, what is the minimum depth and the maximum search time.
Code: Select all
#ifdef SKILL
// Skill structure is used to implement strength limit
struct Skill {
Skill(int l) : level(l) {}
bool enabled() const { return level < 20; }
bool time_to_pick(Depth depth) const { return depth / ONE_PLY == 1 + level; }
Move best_move(size_t multiPV) { return best ? best : pick_best(multiPV); }
Move pick_best(size_t multiPV);
int level;
Move best = MOVE_NONE;
};
#endifCode: Select all
// If skill level is enabled and time is up, pick a sub-optimal best move
#ifdef SKILL
if (skill_.enabled() && skill_.time_to_pick(rootDepth))
skill_.pick_best(multiPV_);
#endifYes, SF level on Lichess is 1 to 8. "1" is the strongest level, I think it search for 2 millions nodes or so.tomitank wrote:From stockfish source code:
Code: Select all
#ifdef SKILL // Skill structure is used to implement strength limit struct Skill { Skill(int l) : level(l) {} bool enabled() const { return level < 20; } bool time_to_pick(Depth depth) const { return depth / ONE_PLY == 1 + level; } Move best_move(size_t multiPV) { return best ? best : pick_best(multiPV); } Move pick_best(size_t multiPV); int level; Move best = MOVE_NONE; }; #endifAccordingly, is the set level + 1 equal to the maximum search depth?Code: Select all
// If skill level is enabled and time is up, pick a sub-optimal best move #ifdef SKILL if (skill_.enabled() && skill_.time_to_pick(rootDepth)) skill_.pick_best(multiPV_); #endif
Code: Select all
impl SkillLevel {
pub fn time(self) -> Duration {
use SkillLevel::*;
Duration::from_millis(match self {
One => 50,
Two => 100,
Three => 150,
Four => 200,
Five => 300,
Six => 400,
Seven => 500,
Eight => 1000,
})
}
pub fn elo(self) -> u32 {
use SkillLevel::*;
match self {
One => 800,
Two => 1100,
Three => 1400,
Four => 1700,
Five => 2000,
Six => 2300,
Seven => 2700,
Eight => 3000,
}
}
pub fn depth(self) -> u8 {
use SkillLevel::*;
match self {
One | Two | Three | Four | Five => 5,
Six => 8,
Seven => 13,
Eight => 22,
}
}
}