diff --git a/src/logic/future_moves.rs b/src/logic/future_moves.rs
index c5350a2..0ba82f4 100644
--- a/src/logic/future_moves.rs
+++ b/src/logic/future_moves.rs
@@ -3,8 +3,10 @@ use crate::{
     repr::{Board, CoordPair, Piece, Winner},
 };
 use allocative::Allocative;
-use indicatif::{ProgressIterator, ProgressStyle};
-use std::{collections::HashMap, hash::BuildHasherDefault, ops::ControlFlow};
+use indicatif::{ParallelProgressIterator, ProgressStyle};
+use rayon::iter::IntoParallelIterator;
+use rayon::prelude::*;
+use std::{collections::HashMap, hash::BuildHasherDefault};
 
 #[derive(Allocative)]
 pub struct FutureMoves {
@@ -158,29 +160,29 @@ impl FutureMoves {
                 )
             };
 
-            let cf = self
-                .leaf_moves()
+            self.leaf_moves()
                 .into_iter()
                 .filter(|&i| self.depth_of(i) == self.current_depth)
                 .collect::<Vec<usize>>()
-                .into_iter()
+                .into_par_iter()
                 .progress_with_style(ProgressStyle::with_template(pstyle_inner).unwrap())
-                .try_for_each(|node_idx| {
-                    self.generate_children(node_idx);
+                .map(|parent_idx| (parent_idx, self.generate_children_raw(parent_idx)))
+                .collect::<Vec<(usize, Vec<Move>)>>()
+                .into_iter()
+                .for_each(|(parent_idx, moves)| {
+                    let start_idx = self.arena.len();
+                    self.arena.extend(moves);
 
-                    if self.arena_len() >= self.config.max_arena_size {
-                        ControlFlow::Break(())
-                    } else {
-                        ControlFlow::Continue(())
-                    }
+                    let new_indices = start_idx..self.arena.len();
+                    self.arena[parent_idx].children.extend(new_indices);
                 });
 
             self.prune_bad_children();
-
-            if cf.is_break() {
-                return;
-            }
             self.current_depth += 1;
+
+            if self.arena.len() >= self.config.max_arena_size {
+                break;
+            }
         }
     }
 
@@ -200,10 +202,7 @@ impl FutureMoves {
         false
     }
 
-    /// Creates children for a parent (`parent_idx`)
-    /// Completely unchecked, the caller should be the one who tests to make sure child generation
-    /// hasn't already been tried on a parent
-    fn generate_children(&mut self, parent_idx: usize) {
+    fn generate_children_raw(&self, parent_idx: usize) -> Vec<Move> {
         let parent = &self.arena[parent_idx];
 
         let new_color = !parent.color;
@@ -230,14 +229,11 @@ impl FutureMoves {
             new.push(Move::new(None, parent_board, new_color, self.agent_color));
         }
 
-        let start_idx = self.arena.len();
-        self.arena.extend(new);
-
-        let new_indices = start_idx..self.arena.len();
-
-        for child_idx in new_indices {
-            self.set_parent_child(parent_idx, child_idx);
+        for m in new.iter_mut() {
+            m.parent = Some(parent_idx);
         }
+
+        new
     }
 
     /// Given an index from `self.arena`, what depth is it at? 0-indexed
diff --git a/src/main.rs b/src/main.rs
index 469475a..631bf0a 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -32,7 +32,7 @@ fn main() {
         min_arena_depth: 14,
         top_k_children: 2,
         up_to_minus: 10,
-        max_arena_size: 100_000_000,
+        max_arena_size: 400_000_000,
         do_prune: true,
         print: true,
         children_eval_method: Default::default(),