diff --git a/src/elo.rs b/src/elo.rs
index 62a715c..3a2a6de 100644
--- a/src/elo.rs
+++ b/src/elo.rs
@@ -9,7 +9,7 @@ use indicatif::{ProgressBar, ProgressStyle};
 use rand::seq::SliceRandom;
 use rayon::iter::{IntoParallelIterator, ParallelIterator};
 use skillratings::{
-    elo::{elo, EloConfig, EloRating},
+    glicko2::{glicko2, Glicko2Rating},
     Outcomes, Rating,
 };
 use std::num::NonZero;
@@ -136,7 +136,7 @@ pub fn run() {
 
 pub struct PlayerArena {
     /// Name, Creator Function, Elo
-    players: Vec<(String, AgentMaker, EloRating)>,
+    players: Vec<(String, AgentMaker, Glicko2Rating)>,
 }
 
 impl std::fmt::Display for PlayerArena {
@@ -162,7 +162,7 @@ impl PlayerArena {
         Self {
             players: players
                 .into_iter()
-                .zip([EloRating::new()].into_iter().cycle())
+                .zip([Default::default()].into_iter().cycle())
                 // flatten tuple
                 .map(|((a, b), c)| (a, b, c))
                 .collect(),
@@ -263,11 +263,11 @@ impl PlayerArena {
     }
 
     fn process_outcome(&mut self, player1: usize, player2: usize, outcome: &Outcomes) {
-        let (np1, np2) = elo(
+        let (np1, np2) = glicko2(
             &self.players[player1].2,
             &self.players[player2].2,
             outcome,
-            &EloConfig { k: 10.0 },
+            &Default::default(),
         );
         self.players[player1].2 = np1;
         self.players[player2].2 = np2;
diff --git a/src/logic/future_moves.rs b/src/logic/future_moves.rs
index 269f2d4..bf66c7f 100644
--- a/src/logic/future_moves.rs
+++ b/src/logic/future_moves.rs
@@ -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 {
diff --git a/src/logic/mvs.rs b/src/logic/mvs.rs
index 4184bc0..f0ab44d 100644
--- a/src/logic/mvs.rs
+++ b/src/logic/mvs.rs
@@ -19,10 +19,11 @@ pub struct MoveValueStats {
 
 impl MoveValueStats {
     #[cfg(test)]
-    pub fn new_from_wins_losses(wins: u16, losses: u16) -> Self {
+    pub fn new_from_outcomes(wins: u16, losses: u16, ties: u16) -> Self {
         Self {
             wins,
             losses,
+            ties,
             ..Default::default()
         }
     }
@@ -56,21 +57,18 @@ impl MoveValueStats {
     }
 
     pub fn populate_self_from_children(&mut self, others: &[Self]) {
-        self.wins = others.iter().map(|x| x.wins).sum::<u16>()
-            + others
-                .iter()
-                .filter(|x| x.state == Some(MVSGameState::Win))
-                .count() as u16;
-        self.losses = others.iter().map(|x| x.losses).sum::<u16>()
-            + others
-                .iter()
-                .filter(|x| x.state == Some(MVSGameState::Loss))
-                .count() as u16;
-        self.ties = others.iter().map(|x| x.ties).sum::<u16>()
-            + others
-                .iter()
-                .filter(|x| x.state == Some(MVSGameState::Tie))
-                .count() as u16;
+        self.wins = others
+            .iter()
+            .map(|x| x.wins + (x.state == Some(MVSGameState::Win)) as u16)
+            .sum::<u16>();
+        self.losses = others
+            .iter()
+            .map(|x| x.losses + (x.state == Some(MVSGameState::Loss)) as u16)
+            .sum::<u16>();
+        self.ties = others
+            .iter()
+            .map(|x| x.ties + (x.state == Some(MVSGameState::Tie)) as u16)
+            .sum::<u16>();
     }
 }
 
@@ -105,29 +103,62 @@ mod tests {
 
     #[test]
     fn two_prob() {
-        let one = MoveValueStats::new_from_wins_losses(10, 4);
-        let two = MoveValueStats::new_from_wins_losses(4, 6);
+        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_wins_losses(10, 4);
+        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_wins_losses(10, 4);
+        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_wins_losses(10, 0);
-        let two = MoveValueStats::new_from_wins_losses(0, 6);
+        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");
+    }
 }
diff --git a/src/main.rs b/src/main.rs
index 982646c..8b2330c 100644
--- a/src/main.rs
+++ b/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(),