diff --git a/src/elo.rs b/src/elo.rs
index 3a2a6de..d34c6ea 100644
--- a/src/elo.rs
+++ b/src/elo.rs
@@ -2,7 +2,7 @@ use crate::{
     agent::{Agent, RandomAgent},
     complexagent::ComplexAgent,
     game_inner::GameInner,
-    logic::{ChildrenEvalMethod, FutureMoveConfig},
+    logic::{ChildrenEvalMethod, FutureMoveConfig, FutureMoves},
     repr::{Board, Piece, Winner},
 };
 use indicatif::{ProgressBar, ProgressStyle};
@@ -18,18 +18,25 @@ type AgentMaker = Box<dyn Fn(Piece) -> Box<dyn Agent>>;
 
 #[allow(dead_code)]
 pub fn run() {
+    let total_memory = 30_000_000_000;
+    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,
+        max_depth: 10,
         min_arena_depth: 14,
         top_k_children: 2,
         up_to_minus: 10,
-        max_arena_size: usize::MAX,
+        // max_arena_size: usize::MAX,
+        max_arena_size: mem_per_thread / FutureMoves::ARENA_ENTRY_SIZE,
         do_prune: false,
         print: false,
         children_eval_method: Default::default(),
     };
 
-    let configs = [4, 5, 6]
+    let configs = [20]
         .into_iter()
         .map(move |d| FutureMoveConfig {
             max_depth: d,
@@ -129,7 +136,7 @@ pub fn run() {
 
     let mut arena = PlayerArena::new(vec);
 
-    arena.prop_arena(100);
+    arena.prop_arena(500);
 
     println!("{}", arena);
 }
diff --git a/src/logic/future_moves.rs b/src/logic/future_moves.rs
index bf66c7f..fcabde2 100644
--- a/src/logic/future_moves.rs
+++ b/src/logic/future_moves.rs
@@ -109,6 +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()
@@ -382,12 +385,15 @@ 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.value),
+                ChildrenEvalMethod::MinMaxProb => self.arena[x]
+                    .children
+                    .iter()
+                    .max_by_key(|&&idx| self.arena[idx].value),
             })
             .inspect(|&&x| {
                 assert_eq!(