commit old stuff

src/elo.rs

@@ -1,15 +1,15 @@
 use crate::{
-    agent::Agent,
+    agent::{Agent, RandomAgent},
     complexagent::ComplexAgent,
     game_inner::GameInner,
-    logic::{ChildrenEvalMethod, FutureMoveConfig},
+    logic::{ChildrenEvalMethod, FutureMoveConfig, FutureMoves},
     repr::{Board, Piece, Winner},
 };
-use indicatif::{ParallelProgressIterator, ProgressBar, ProgressDrawTarget, ProgressStyle};
+use indicatif::{ProgressBar, ProgressStyle};
 use rand::seq::SliceRandom;
 use rayon::iter::{IntoParallelIterator, ParallelIterator};
 use skillratings::{
-    elo::{elo, EloConfig, EloRating},
+    glicko2::{confidence_interval, glicko2, Glicko2Rating},
     Outcomes, Rating,
 };
 use std::num::NonZero;
@@ -18,18 +18,19 @@ type AgentMaker = Box<dyn Fn(Piece) -> Box<dyn Agent>>;
 
 #[allow(dead_code)]
 pub fn run() {
+    let total_memory = 30_000_000_000; // 30 GB
+    let num_threads = std::thread::available_parallelism()
+        .map(NonZero::get)
+        .expect("unable to get number of threads");
+    let mem_per_thread = total_memory / num_threads;
+
     let fmv_base = FutureMoveConfig {
-        max_depth: 20,
-        min_arena_depth: 14,
-        top_k_children: 2,
-        up_to_minus: 10,
-        max_arena_size: usize::MAX,
-        do_prune: false,
+        max_arena_size: mem_per_thread / FutureMoves::ARENA_ENTRY_SIZE,
         print: false,
-        children_eval_method: Default::default(),
+        ..Default::default()
     };
 
-    let configs = [4, 5, 6]
+    let configs = [2, 3, 4, 5, 6, 7, 8]
         .into_iter()
         .map(move |d| FutureMoveConfig {
             max_depth: d,
@@ -110,7 +111,7 @@ pub fn run() {
                 .collect()
         });
 
-    let vec: Vec<(String, AgentMaker)> = configs
+    let mut vec: Vec<(String, AgentMaker)> = configs
         .into_iter()
         .map(move |config| -> (String, AgentMaker) {
             (
@@ -119,33 +120,45 @@ pub fn run() {
             )
         })
         .collect();
-    // vec.push((
-    //     "RandomAgent".to_string(),
-    //     Box::new(move |piece| Box::new(RandomAgent::new(piece))),
-    // ));
+
+    if false {
+        vec.push((
+            "RandomAgent".to_string(),
+            Box::new(move |piece| Box::new(RandomAgent::new(piece))),
+        ));
+    }
 
     let mut arena = PlayerArena::new(vec);
 
-    arena.prop_arena(1000);
+    arena.prop_arena(500);
 
     println!("{}", arena);
 }
 
 pub struct PlayerArena {
     /// Name, Creator Function, Elo
-    players: Vec<(String, AgentMaker, EloRating)>,
+    players: Vec<(String, AgentMaker, Glicko2Rating)>,
 }
 
 impl std::fmt::Display for PlayerArena {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
         let mut players_i: Vec<usize> = (0..self.players.len()).collect();
-        players_i.sort_by_key(|&i| -(self.players[i].2.rating() * 100.0) as i64);
+
+        players_i.sort_by(|&a, &b| {
+            self.players[b]
+                .2
+                .rating()
+                .total_cmp(&self.players[a].2.rating())
+        });
 
         for i in players_i {
+            let conf_interval = confidence_interval(&self.players[i].2);
+
             writeln!(
                 f,
-                "({:.2}): {}",
+                "({:.2}[+/-{:.2}]): {}",
                 self.players[i].2.rating(),
+                conf_interval.1 - self.players[i].2.rating(),
                 self.players[i].0
             )?;
         }
@@ -159,9 +172,8 @@ impl PlayerArena {
         Self {
             players: players
                 .into_iter()
-                .zip([EloRating::new()].into_iter().cycle())
-                // flatten tuple
-                .map(|((a, b), c)| (a, b, c))
+                // All starting ratings should be the default
+                .map(|(a, b)| (a, b, Default::default()))
                 .collect(),
         }
     }
@@ -172,7 +184,10 @@ impl PlayerArena {
             .map(|&(i, j)| {
                 (
                     (i, j),
-                    Self::create_agents(&self.players[i].1, &self.players[j].1),
+                    (
+                        (self.players[i].1)(Piece::Black),
+                        (self.players[j].1)(Piece::White),
+                    ),
                 )
             })
             .collect::<Vec<_>>();
@@ -189,7 +204,6 @@ impl PlayerArena {
         // Spawn parallel processing in a dedicated thread
         let processing_thread = {
             let sender = sender.clone();
-            let term = term.clone();
 
             std::thread::spawn(move || {
                 rayon::ThreadPoolBuilder::new()
@@ -203,22 +217,6 @@ impl PlayerArena {
 
                 created_pairs
                     .into_par_iter()
-                    .progress_with({
-                        let a = ProgressBar::new(num as u64).with_style(
-                            ProgressStyle::with_template(
-                                "[{elapsed_precise}] {pos:>7}/{len:7} ETA: {eta}",
-                            )
-                            .expect("invalid ProgressStyle"),
-                        );
-                        a.set_draw_target(ProgressDrawTarget::term(term, 5));
-                        a
-                    })
-                    .progress_with_style(
-                        ProgressStyle::with_template(
-                            "[{elapsed_precise}] {pos:>7}/{len:7} ETA: {eta}",
-                        )
-                        .expect("invalid ProgressStyle"),
-                    )
                     .map(|((i, j), (p1, p2))| (i, j, Self::play_two_inner(p1, p2)))
                     .for_each(|(i, j, o)| {
                         sender.send((i, j, o)).expect("Failed to send result");
@@ -231,17 +229,29 @@ impl PlayerArena {
 
         // Process results on main thread as they arrive
         let mut received_num = 0;
+        let p = ProgressBar::new(num as u64).with_style(
+            ProgressStyle::with_template("[{elapsed_precise}] {pos:>7}/{len:7} ETA: {eta}")
+                .expect("invalid ProgressStyle"),
+        );
+
         while let Ok((i, j, o)) = receiver.recv() {
             self.process_outcome(i, j, &o);
-            received_num += 1;
 
-            term.clear_last_lines(self.players.len())
-                .expect("unable to clear prev lines");
+            if received_num > 0 {
+                term.clear_last_lines(self.players.len() + 1)
+                    .expect("unable to clear prev lines");
+            }
             term.write_str(format!("{}", self).as_str())
                 .expect("unable to write leaderboard");
 
+            received_num += 1;
+            p.inc(1);
+            // add extra newline after progressbar
+            println!();
+
             // break if all pairs were recieved
             if received_num == num {
+                drop(receiver);
                 break;
             }
         }
@@ -253,35 +263,25 @@ impl PlayerArena {
     }
 
     fn prop_arena(&mut self, n: usize) {
-        self.play(
-            &(0..self.players.len())
-                .flat_map(|i| {
-                    (0..self.players.len())
-                        .map(move |j| (i, j))
-                        .filter(|(i, j)| i != j)
-                        .collect::<Vec<_>>()
-                })
-                .collect::<Vec<_>>()
-                .repeat(n),
-        );
+        let mut games = (0..self.players.len())
+            .flat_map(|i| {
+                (0..self.players.len())
+                    .map(move |j| (i, j))
+                    .filter(|(i, j)| i != j)
+            })
+            .collect::<Vec<_>>()
+            .repeat(n);
+        games.shuffle(&mut rand::rng());
+        self.play(&games);
     }
 
     fn process_outcome(&mut self, player1: usize, player2: usize, outcome: &Outcomes) {
-        let (np1, np2) = elo(
+        (self.players[player1].2, self.players[player2].2) = glicko2(
             &self.players[player1].2,
             &self.players[player2].2,
             outcome,
-            &EloConfig::new(),
+            &Default::default(),
         );
-        self.players[player1].2 = np1;
-        self.players[player2].2 = np2;
-    }
-
-    fn create_agents(
-        player_1_fn: &AgentMaker,
-        player_2_fn: &AgentMaker,
-    ) -> (Box<dyn Agent>, Box<dyn Agent>) {
-        (player_1_fn(Piece::Black), player_2_fn(Piece::White))
     }
 
     fn play_two_inner(player_1: Box<dyn Agent>, player_2: Box<dyn Agent>) -> Outcomes {
@@ -289,7 +289,8 @@ impl PlayerArena {
             player_1,
             player_2,
             false,
-            Board::random(rand::random_range(1..=15)),
+            // Board::random(rand::random_range(4..=15)),
+            Board::STARTING_POSITION,
         )
         .expect("unable to create game")
         .loop_until_result();

src/logic/future_moves.rs

@@ -34,7 +34,7 @@ pub struct FutureMoves {
     board: Board,
 }
 
-#[derive(Copy, Clone, Allocative)]
+#[derive(Copy, Clone, Allocative, Default)]
 pub struct FutureMoveConfig {
     /// Max depth of that we should try and traverse
     pub max_depth: usize,
@@ -87,21 +87,17 @@ impl std::fmt::Display for FutureMoveConfig {
     }
 }
 
-#[derive(Debug, Clone, Copy, Allocative)]
+#[derive(Debug, Clone, Copy, Allocative, Default)]
 #[allow(dead_code)]
 pub enum ChildrenEvalMethod {
     /// Best so far?
+    // #[default]
     MinMax,
 
+    #[default]
     MinMaxProb,
 }
 
-impl Default for ChildrenEvalMethod {
-    fn default() -> Self {
-        Self::MinMax
-    }
-}
-
 impl FutureMoves {
     pub const fn new(agent_color: Piece, config: FutureMoveConfig) -> Self {
         Self {
@@ -113,6 +109,9 @@ impl FutureMoves {
         }
     }
 
+    pub const ARENA_ENTRY_SIZE: usize =
+        size_of::<Move>() + size_of::<usize>() * (Board::AREA.0 as usize / 4);
+
     /// Return the length of the Arena
     pub fn arena_len(&self) -> usize {
         self.arena.len()
@@ -214,18 +213,7 @@ impl FutureMoves {
     }
 
     fn create_move(&self, coord: MoveCoord, board: Board, color: Piece) -> Move {
-        Move::new(
-            coord,
-            board,
-            color,
-            self.agent_color,
-            MoveValueConfig {
-                self_value_raw: matches!(
-                    self.config.children_eval_method,
-                    ChildrenEvalMethod::MinMaxProb
-                ),
-            },
-        )
+        Move::new(coord, board, color, self.agent_color, MoveValueConfig {})
     }
 
     fn generate_children_raw(&self, parent_idx: usize) -> Vec<Move> {
@@ -308,52 +296,29 @@ impl FutureMoves {
                     .iter()
                     .map(|&child| self.arena[child].value)
                     .collect::<Vec<_>>();
+                let child_value = if self.arena[idx].color == self.agent_color {
+                    // get best (for the adversary) enemy play
+                    // this assumes the adversary is playing optimally
+
+                    children_values.iter().min()
+                } else {
+                    children_values.iter().max()
+                }
+                .cloned()
+                .unwrap_or(Default::default());
+                self.arena[idx].value = self.arena[idx].self_value;
 
                 match self.config.children_eval_method {
                     ChildrenEvalMethod::MinMax => {
-                        let child_value = if self.arena[idx].color == self.agent_color {
-                            // get best (for the adversary) enemy play
-                            // this assumes the adversary is playing optimally
-
-                            children_values
-                                .into_iter()
-                                .min_by_key(|x| x.value)
-                                .map(|x| x.value)
-                        } else {
-                            children_values
-                                .into_iter()
-                                .max_by_key(|x| x.value)
-                                .map(|x| x.value)
-                        }
-                        .unwrap_or(0);
-                        // we use `depth` and divided `self_value` by it, idk if this is worth it
-                        // we should really setup some sort of ELO rating for each commit, playing them against
-                        // each other or something, could be cool to benchmark these more subjective things, not
-                        // just performance (cycles/time wise)
-                        self.arena[idx].value.value =
-                            self.arena[idx].self_value as i32 + child_value;
+                        self.arena[idx].value.value += child_value.value;
+                        self.arena[idx].value.set_state(child_value.state());
                     }
                     ChildrenEvalMethod::MinMaxProb => {
-                        let child_value = if self.arena[idx].color == self.agent_color {
-                            // get best (for the adversary) enemy play
-                            // this assumes the adversary is playing optimally
-
-                            children_values.iter().min()
-                        } else {
-                            children_values.iter().max()
-                        }
-                        .cloned()
-                        .unwrap_or(Default::default());
-                        // we use `depth` and divided `self_value` by it, idk if this is worth it
-                        // we should really setup some sort of ELO rating for each commit, playing them against
-                        // each other or something, could be cool to benchmark these more subjective things, not
-                        // just performance (cycles/time wise)
                         self.arena[idx]
                             .value
                             .populate_self_from_children(&children_values);
 
-                        self.arena[idx].value.value =
-                            self.arena[idx].self_value as i32 + child_value.value;
+                        self.arena[idx].value.value += child_value.value;
                     }
                 }
             }
@@ -399,12 +364,15 @@ impl FutureMoves {
     /// Return the best move which is a child of `self.current_root`
     pub fn best_move(&self) -> Option<MoveCoord> {
         self.current_root
-            .and_then(|x| {
-                self.arena[x]
+            .and_then(|x| match self.config.children_eval_method {
+                ChildrenEvalMethod::MinMax => self.arena[x]
                     .children
                     .iter()
-                    // this would be considered `minimax`
-                    .max_by_key(|&&idx| self.arena[idx].value)
+                    .max_by_key(|&&idx| self.arena[idx].value),
+                ChildrenEvalMethod::MinMaxProb => self.arena[x]
+                    .children
+                    .iter()
+                    .max_by_key(|&&idx| self.arena[idx].value),
             })
             .inspect(|&&x| {
                 assert_eq!(

src/logic/mod.rs

@@ -1,5 +1,6 @@
 mod board_value;
 mod future_moves;
 mod r#move;
+mod mvs;
 pub use future_moves::{ChildrenEvalMethod, FutureMoveConfig, FutureMoves};
 pub use r#move::MoveCoord;

src/logic/move.rs

@@ -1,78 +1,12 @@
-use std::cmp::Ordering;
-
-use super::board_value::BoardValueMap;
+use super::{
+    board_value::BoardValueMap,
+    mvs::{MVSGameState, MoveValueStats},
+};
 use crate::repr::{Board, CoordPair, Piece, Winner};
 use allocative::Allocative;
 
 pub type MoveCoord = Option<CoordPair>;
 
-#[derive(Clone, Copy, PartialEq, Eq, Allocative, Debug, PartialOrd, Ord)]
-pub enum MVSGameState {
-    Win = 1,
-    Loss = 0,
-    Tie = -1,
-}
-
-#[derive(Clone, Copy, Debug, Allocative, PartialEq, Eq, Default)]
-pub struct MoveValueStats {
-    state: Option<MVSGameState>,
-    wins: u16,
-    losses: u16,
-    pub value: i32,
-}
-
-impl MoveValueStats {
-    fn chance_win(&self) -> Option<f32> {
-        let sum = self.losses + self.wins;
-        if sum == 0 {
-            return None;
-        }
-        Some(self.wins as f32 / sum as f32)
-    }
-
-    pub fn populate_self_from_children(&mut self, others: &[Self]) {
-        let wins = others.iter().map(|x| x.wins).sum::<u16>()
-            + others
-                .iter()
-                .filter(|x| x.state == Some(MVSGameState::Win))
-                .count() as u16;
-        let losses = others.iter().map(|x| x.losses).sum::<u16>()
-            + others
-                .iter()
-                .filter(|x| x.state == Some(MVSGameState::Loss))
-                .count() as u16;
-
-        self.wins = wins;
-        self.losses = losses;
-    }
-}
-
-impl PartialOrd for MoveValueStats {
-    fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
-        Some(self.cmp(other))
-    }
-}
-
-impl Ord for MoveValueStats {
-    fn cmp(&self, other: &Self) -> Ordering {
-        if self.state.is_some() && other.state.is_some() {
-            return self.state.cmp(&other.state);
-        }
-
-        let s_cw = self.chance_win();
-        let o_cw = other.chance_win();
-        if s_cw.is_some() && o_cw.is_some() {
-            if s_cw > o_cw {
-                return Ordering::Greater;
-            } else if o_cw > s_cw {
-                return Ordering::Less;
-            }
-        }
-
-        self.value.cmp(&other.value)
-    }
-}
-
 #[derive(Clone, Debug, Allocative)]
 pub struct Move {
     /// Coordinates (i, j) of the move (if it exists)
@@ -95,7 +29,7 @@ pub struct Move {
     pub value: MoveValueStats,
 
     /// What is the inherit value of this move (not including children)
-    pub self_value: i16,
+    pub self_value: MoveValueStats,
 
     /// Which color made a move on this move?
     pub color: Piece,
@@ -104,9 +38,7 @@ pub struct Move {
     pub is_trimmed: bool,
 }
 
-pub struct MoveValueConfig {
-    pub self_value_raw: bool,
-}
+pub struct MoveValueConfig {}
 
 impl Move {
     pub fn new(
@@ -114,7 +46,7 @@ impl Move {
         board: Board,
         color: Piece,
         agent_color: Piece,
-        mvc: MoveValueConfig,
+        _: MoveValueConfig,
     ) -> Self {
         let mut m = Move {
             coord,
@@ -124,49 +56,29 @@ impl Move {
             value: Default::default(),
             color,
             is_trimmed: false,
-            self_value: 0,
+            self_value: Default::default(),
         };
 
         // set wins/losses values appropriately
         match m.winner {
             Winner::Player(piece) => {
                 if piece == agent_color {
-                    m.value.wins += 1;
-                    m.value.state = Some(MVSGameState::Win);
+                    m.self_value.set_state(Some(MVSGameState::Win));
                 } else {
-                    m.value.losses += 1;
-                    m.value.state = Some(MVSGameState::Loss);
+                    m.self_value.set_state(Some(MVSGameState::Loss));
                 }
             }
             Winner::Tie => {
-                m.value.state = Some(MVSGameState::Tie);
+                m.self_value.set_state(Some(MVSGameState::Tie));
             }
             Winner::None => {}
         }
 
-        if !mvc.self_value_raw {
-            m.self_value = m.compute_self_value(agent_color, &board, mvc);
-        } else {
-            m.self_value = const { BoardValueMap::weighted() }.board_value(&board, agent_color);
-        }
+        m.self_value.value =
+            const { BoardValueMap::weighted() }.board_value(&board, agent_color) as i32;
         m
     }
 
-    fn compute_self_value(&self, agent_color: Piece, board: &Board, _mvc: MoveValueConfig) -> i16 {
-        if self.winner == Winner::Player(!agent_color) {
-            // if this board results in the opponent winning, MAJORLY negatively weigh this move
-            // NOTE! this branch isn't completely deleted because if so, the bot wouldn't make a move.
-            // We shouldn't prune branches because we still need to always react to the opponent's moves
-            return i16::MIN + 1;
-        } else if self.winner == Winner::Player(agent_color) {
-            // results in a win for the agent
-            return i16::MAX - 1;
-        }
-
-        // I guess ignore Ties here, don't give them an explicit value,
-        const { BoardValueMap::weighted() }.board_value(board, agent_color)
-    }
-
     /// Sort children of the [`Move`] by their self_value in `arena`
     pub fn sort_children(&mut self, arena: &[Move]) {
         self.children.sort_by(|&a, &b| {

src/logic/mvs.rs

@@ -0,0 +1,164 @@
+use allocative::Allocative;
+use std::cmp::Ordering;
+
+#[derive(Clone, Copy, PartialEq, Eq, Allocative, Debug, PartialOrd, Ord)]
+pub enum MVSGameState {
+    Win = 1,
+    Tie = 0,
+    Loss = -1,
+}
+
+#[derive(Clone, Copy, Debug, Allocative, PartialEq, Eq, Default)]
+pub struct MoveValueStats {
+    state: Option<MVSGameState>,
+    wins: u16,
+    losses: u16,
+    ties: u16,
+    pub value: i32,
+}
+
+impl MoveValueStats {
+    #[cfg(test)]
+    pub fn new_from_outcomes(wins: u16, losses: u16, ties: u16) -> Self {
+        Self {
+            wins,
+            losses,
+            ties,
+            ..Default::default()
+        }
+    }
+
+    #[cfg(test)]
+    pub fn new_from_value(value: i32) -> Self {
+        Self {
+            value,
+            ..Default::default()
+        }
+    }
+
+    #[cfg(test)]
+    pub fn new_from_state(state: Option<MVSGameState>) -> Self {
+        Self {
+            state,
+            ..Default::default()
+        }
+    }
+
+    fn chance_win(&self) -> Option<f32> {
+        let sum = self.losses + self.wins + self.ties;
+        if 20 > sum {
+            return None;
+        }
+        Some(self.wins as f32 / sum as f32)
+    }
+
+    pub const fn set_state(&mut self, state: Option<MVSGameState>) {
+        self.state = state;
+    }
+
+    pub const fn state(&self) -> Option<MVSGameState> {
+        self.state
+    }
+
+    pub fn populate_self_from_children(&mut self, others: &[Self]) {
+        (self.wins, self.losses, self.ties) =
+            others.iter().fold((0, 0, 0), |(wins, losses, ties), x| {
+                (
+                    wins + x.wins + (x.state == Some(MVSGameState::Win)) as u16,
+                    losses + x.losses + (x.state == Some(MVSGameState::Loss)) as u16,
+                    ties + x.ties + (x.state == Some(MVSGameState::Tie)) as u16,
+                )
+            });
+    }
+}
+
+impl PartialOrd for MoveValueStats {
+    fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
+        Some(self.cmp(other))
+    }
+}
+
+impl Ord for MoveValueStats {
+    fn cmp(&self, other: &Self) -> Ordering {
+        if self.state.is_some() || other.state.is_some() {
+            return self.state.cmp(&other.state);
+        }
+
+        let (s_cw, o_cw) = (self.chance_win(), other.chance_win());
+        if s_cw.is_some() || o_cw.is_some() {
+            if s_cw > o_cw {
+                return Ordering::Greater;
+            } else if o_cw > s_cw {
+                return Ordering::Less;
+            }
+        }
+
+        self.value.cmp(&other.value)
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+
+    #[test]
+    fn two_prob() {
+        let one = MoveValueStats::new_from_outcomes(100, 40, 0);
+
+        let two = MoveValueStats::new_from_outcomes(40, 60, 0);
+        assert!(one > two);
+    }
+
+    #[test]
+    fn one_prob_one_non() {
+        let one = MoveValueStats::new_from_outcomes(100, 4, 0);
+        let two = MoveValueStats::new_from_value(10);
+        assert!(one > two);
+    }
+
+    #[test]
+    fn one_prob_one_win() {
+        let one = MoveValueStats::new_from_outcomes(100, 4, 0);
+        let two = MoveValueStats::new_from_state(Some(MVSGameState::Win));
+        assert!(one < two);
+    }
+
+    #[test]
+    fn two_prob_zero() {
+        let one = MoveValueStats::new_from_outcomes(100, 0, 0);
+        let two = MoveValueStats::new_from_outcomes(0, 60, 0);
+        assert!(one > two);
+    }
+
+    #[test]
+    fn test_children_pop() {
+        let mut a = MoveValueStats::new_from_value(0);
+
+        let children = vec![
+            MoveValueStats::new_from_outcomes(1, 0, 0),
+            MoveValueStats::new_from_outcomes(0, 2, 0),
+            MoveValueStats::new_from_outcomes(0, 0, 3),
+        ];
+        a.populate_self_from_children(&children);
+        assert_eq!(a.wins, 1, "Wins should be 1");
+        assert_eq!(a.losses, 2, "Losses should be 2");
+        assert_eq!(a.ties, 3, "Ties should be 3");
+    }
+
+    #[test]
+    fn test_children_pop_state() {
+        let mut a = MoveValueStats::new_from_value(0);
+
+        let children = vec![
+            MoveValueStats::new_from_state(Some(MVSGameState::Win)),
+            MoveValueStats::new_from_state(Some(MVSGameState::Win)),
+            MoveValueStats::new_from_state(Some(MVSGameState::Loss)),
+            MoveValueStats::new_from_state(Some(MVSGameState::Tie)),
+            MoveValueStats::new_from_state(Some(MVSGameState::Tie)),
+        ];
+        a.populate_self_from_children(&children);
+        assert_eq!(a.wins, 2, "Wins should be 2");
+        assert_eq!(a.losses, 1, "Losses should be 1");
+        assert_eq!(a.ties, 2, "Ties should be 2");
+    }
+}

src/main.rs

@@ -39,7 +39,7 @@ fn main() {
         min_arena_depth: 14,
         top_k_children: 2,
         up_to_minus: 10,
-        max_arena_size: 200_000_000,
+        max_arena_size: 50_000_000,
         do_prune: false,
         print: true,
         children_eval_method: Default::default(),

src/repr/pos_map.rs

@@ -14,12 +14,12 @@ impl<T: Copy> PosMap<T> {
         Self(MaybeUninit::zeroed().assume_init())
     }
 
-    pub const fn from(v: [[T; Board::SIZE as usize]; Board::SIZE as usize]) -> Self {
+    pub const fn from(mut v: [[T; Board::SIZE as usize]; Board::SIZE as usize]) -> Self {
         let mut n = unsafe { Self::uninit() };
 
         const_for!(i in 0..Board::SIZE => {
             const_for!(j in 0..Board::SIZE => {
-                n.set(CoordPair::from_axes(i, j), v[i as usize][j as usize]);
+                std::mem::swap(n.get_mut(CoordPair::from_axes(i, j)), &mut v[i as usize][j as usize]);
             });
         });
         n