dogeystamp/chess_inator
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

tune: repetition history set to 100 plies

Browse Source
This commit is contained in:
dogeystamp 2024-12-28 21:33:29 -05:00
parent ede46552fe
commit e27e18e482
No known key found for this signature in database
1 changed files with 14 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

18
src/lib.rs
View File

@ -516,9 +516,8 @@ mod ringptr_tests {
/// Ring-buffer of previously seen hashes, used to avoid draw by repetition.
///
/// Only stores at most `HISTORY_SIZE` plies, since most cases of repetition happen recently.
/// Technically, it should be 100 plies because of the 50-move rule.
#[derive(Default, Clone, Copy, Debug)]
/// Only stores at most `HISTORY_SIZE` plies.
#[derive(Clone, Copy, Debug)]
struct BoardHistory {
hashes: [Zobrist; HISTORY_SIZE],
/// Index of the start of the history in the buffer
@ -527,6 +526,17 @@ struct BoardHistory {
ptr_end: RingPtr<HISTORY_SIZE>,
}
impl Default for BoardHistory {
fn default() -> Self {
BoardHistory {
// rust can't derive this
hashes: [Zobrist::default(); HISTORY_SIZE],
ptr_start: Default::default(),
ptr_end: Default::default(),
}
}
}
impl PartialEq for BoardHistory {
/// Always equal, since comparing two boards with different histories shouldn't matter.
fn eq(&self, _other: &Self) -> bool {
@ -539,7 +549,7 @@ impl Eq for BoardHistory {}
/// Size in plies of the board history.
///
/// Actual capacity is one less than this.
const HISTORY_SIZE: usize = 15;
const HISTORY_SIZE: usize = 100;
impl BoardHistory {
/// Counts occurences of this hash in the history.