diff --git a/benches/future_children.rs b/benches/future_children.rs
index b01527a..b2e2ad6 100644
--- a/benches/future_children.rs
+++ b/benches/future_children.rs
@@ -12,6 +12,7 @@ fn extend_layers_no_pruning(depth: usize, arena_size: usize) -> usize {
         up_to_minus: 4,
         max_arena_size: arena_size,
         do_not_prune: true,
+        print: false,
     };
     let mut fut = FutureMoves::new(Piece::Black, config);
     fut.set_root_from_board(Board::new().starting_pos());
diff --git a/src/elo.rs b/src/elo.rs
index cc5f652..5349df8 100644
--- a/src/elo.rs
+++ b/src/elo.rs
@@ -11,38 +11,131 @@ use skillratings::{
 };
 
 pub fn run() {
+    const FMV_BASE: FutureMoveConfig = FutureMoveConfig {
+        max_depth: 20,
+        min_arena_depth: 14,
+        top_k_children: 2,
+        up_to_minus: 10,
+        max_arena_size: 5_000_000,
+        do_not_prune: false,
+        print: false,
+    };
+
     let mut arena = PlayerArena::new(vec![
         (
             "RandomAgent".into(),
             Box::new(|piece| Box::new(RandomAgent::new(piece))),
+            1,
         ),
         (
-            "ComplexAgentBasic".into(),
+            "ComplexAgent100K".into(),
             Box::new(|piece| {
                 Box::new(ComplexAgent::new(
                     piece,
                     FutureMoveConfig {
-                        max_depth: 20,
-                        min_arena_depth: 14,
-                        top_k_children: 2,
-                        up_to_minus: 10,
                         max_arena_size: 100_000,
-                        do_not_prune: false,
-                        print: false,
+                        ..FMV_BASE
                     },
                 ))
             }),
+            1,
+        ),
+        (
+            "ComplexAgent500K".into(),
+            Box::new(|piece| {
+                Box::new(ComplexAgent::new(
+                    piece,
+                    FutureMoveConfig {
+                        max_arena_size: 500_000,
+                        ..FMV_BASE
+                    },
+                ))
+            }),
+            1,
+        ),
+        (
+            "ComplexAgent1M".into(),
+            Box::new(|piece| {
+                Box::new(ComplexAgent::new(
+                    piece,
+                    FutureMoveConfig {
+                        max_arena_size: 1_000_000,
+                        ..FMV_BASE
+                    },
+                ))
+            }),
+            1,
+        ),
+        // NO PRUNING :
+        (
+            "ComplexAgent100K_NOPRUNE".into(),
+            Box::new(|piece| {
+                Box::new(ComplexAgent::new(
+                    piece,
+                    FutureMoveConfig {
+                        max_arena_size: 100_000,
+                        do_not_prune: true,
+                        ..FMV_BASE
+                    },
+                ))
+            }),
+            1,
+        ),
+        (
+            "ComplexAgent500K_NOPRUNE".into(),
+            Box::new(|piece| {
+                Box::new(ComplexAgent::new(
+                    piece,
+                    FutureMoveConfig {
+                        max_arena_size: 500_000,
+                        do_not_prune: true,
+                        ..FMV_BASE
+                    },
+                ))
+            }),
+            1,
+        ),
+        (
+            "ComplexAgent1M_NOPRUNE".into(),
+            Box::new(|piece| {
+                Box::new(ComplexAgent::new(
+                    piece,
+                    FutureMoveConfig {
+                        max_arena_size: 1_000_000,
+                        do_not_prune: true,
+                        ..FMV_BASE
+                    },
+                ))
+            }),
+            1,
         ),
     ]);
-    for _ in 0..10 {
-        arena.play_two(0, 1);
+
+    // for _ in 0..100 {
+    //     arena.prop_arena();
+    // }
+
+    for _ in 0..20 {
+        arena.play_all_against(0);
     }
 
+    // for _ in 0..2 {
+    //     arena.play_two(1, 2);
+    // }
+
     println!("{}", arena);
 }
 
 pub struct PlayerArena {
-    players: Vec<(String, Box<dyn Fn(Piece) -> Box<dyn Agent>>, EloRating)>,
+    /// Name, Creator, Elo, freq (mod)
+    players: Vec<(
+        String,
+        Box<dyn Fn(Piece) -> Box<dyn Agent>>,
+        EloRating,
+        usize,
+    )>,
+
+    freq_map: Vec<usize>,
 }
 
 impl std::fmt::Display for PlayerArena {
@@ -64,23 +157,68 @@ impl std::fmt::Display for PlayerArena {
 }
 
 impl PlayerArena {
-    pub fn new(players: Vec<(String, Box<dyn Fn(Piece) -> Box<dyn Agent>>)>) -> Self {
+    pub fn new(players: Vec<(String, Box<dyn Fn(Piece) -> Box<dyn Agent>>, usize)>) -> Self {
+        let len = players.len();
         Self {
             players: players
                 .into_iter()
                 .zip([EloRating::new()].into_iter().cycle())
-                .map(|((a, b), c)| (a, b, c))
+                .map(|((a, b, d), c)| (a, b, c, d))
                 .collect(),
+            freq_map: [0].repeat(len).to_vec(),
+        }
+    }
+
+    fn play_all_against(&mut self, i: usize) {
+        for j in 0..self.players.len() {
+            if i == j {
+                continue;
+            }
+            self.freq_map[i] += 1;
+            self.freq_map[j] += 1;
+            if self.freq_map[i] % self.players[i].3 != 0 {
+                continue;
+            }
+
+            if self.freq_map[j] % self.players[j].3 != 0 {
+                continue;
+            }
+
+            self.play_two(i, j);
+        }
+    }
+
+    fn prop_arena(&mut self) {
+        for i in 0..self.players.len() {
+            self.play_all_against(i);
         }
     }
 
     fn play_two(&mut self, player1: usize, player2: usize) {
-        let result = GameInner::new(
-            self.players[player1].1(Piece::Black),
-            self.players[player2].1(Piece::White),
-            false,
-        )
-        .loop_until_result();
+        println!(
+            "{} vs {}...",
+            self.players[player1].0, self.players[player2].0
+        );
+
+        let (np1, np2) = Self::play_two_inner(
+            &self.players[player1].1,
+            &self.players[player2].1,
+            &self.players[player1].2,
+            &self.players[player2].2,
+        );
+        self.players[player1].2 = np1;
+        self.players[player2].2 = np2;
+    }
+
+    fn play_two_inner(
+        player_1_fn: &Box<dyn Fn(Piece) -> Box<dyn Agent>>,
+        player_2_fn: &Box<dyn Fn(Piece) -> Box<dyn Agent>>,
+        player_1_elo: &EloRating,
+        player_2_elo: &EloRating,
+    ) -> (EloRating, EloRating) {
+        let result = GameInner::new(player_1_fn(Piece::Black), player_2_fn(Piece::White), false)
+            .loop_until_result();
+
         let outcome = match result {
             Winner::Player(piece) => match piece {
                 Piece::Black => Outcomes::WIN,
@@ -89,13 +227,7 @@ impl PlayerArena {
             Winner::Tie => Outcomes::DRAW,
             Winner::None => panic!("somehow met None"),
         };
-        let (np1, np2) = elo(
-            &self.players[player1].2,
-            &self.players[player2].2,
-            &outcome,
-            &EloConfig::new(),
-        );
-        self.players[player1].2 = np1;
-        self.players[player2].2 = np2;
+
+        elo(player_1_elo, player_2_elo, &outcome, &EloConfig::new())
     }
 }
diff --git a/src/game.rs b/src/game.rs
index 44bd168..c3c2864 100644
--- a/src/game.rs
+++ b/src/game.rs
@@ -1,7 +1,6 @@
 use crate::{
     agent::Agent,
     game_inner::GameInner,
-    repr::{Board, Piece, Winner},
 };
 
 pub struct Game {