diff --git a/src/models/battle_results_dat.rs b/src/models/battle_results_dat.rs
index 973a92a..7d8579c 100644
--- a/src/models/battle_results_dat.rs
+++ b/src/models/battle_results_dat.rs
@@ -10,14 +10,22 @@ use crate::result::Result;
 
 /// Represents un-pickled `battle_results.dat`.
 #[derive(Debug, Deserialize)]
-pub struct BattleResultsDat(
-    /// No idea what this is.
-    /// My best guess – some kind of checksum,
-    /// but none of MD5, SHA1, SHA224, SHA256, SHA384, SHA512, nor CRC64 over the buffer have matched.
-    pub u64,
+#[serde(from = "(u64, ByteBuf)")]
+pub struct BattleResultsDat {
+    pub arena_unique_id: u64,
+
     /// Protobuf-serialized battle results.
-    pub ByteBuf,
-);
+    pub buffer: ByteBuf,
+}
+
+impl From<(u64, ByteBuf)> for BattleResultsDat {
+    fn from((arena_unique_id, buffer): (u64, ByteBuf)) -> Self {
+        Self {
+            arena_unique_id,
+            buffer,
+        }
+    }
+}
 
 impl BattleResultsDat {
     /// Parses the pickled structure from the reader which contains `battle_results.dat`.
@@ -30,7 +38,7 @@ impl BattleResultsDat {
 
     /// Decodes the battle results from the internal buffer.
     pub fn decode_battle_results(&self) -> Result<BattleResults> {
-        BattleResults::decode(self.1.as_ref()).map_err(Error::DecodeFailed)
+        BattleResults::decode(self.buffer.as_ref()).map_err(Error::DecodeFailed)
     }
 }
 
diff --git a/tests/battle_results.rs b/tests/battle_results.rs
index 48ebcbf..08b485a 100644
--- a/tests/battle_results.rs
+++ b/tests/battle_results.rs
@@ -5,8 +5,10 @@ use wotbreplay_parser::prelude::*;
 
 #[test]
 fn player_results_ok() -> Result<()> {
-    let battle_results = Replay::open(File::open("tests/replays/player_results.wotbreplay")?)?
-        .read_battle_results()?;
+    let battle_results_dat = Replay::open(File::open("tests/replays/player_results.wotbreplay")?)?
+        .read_battle_results_dat()?;
+    assert_eq!(battle_results_dat.arena_unique_id, 1661909200500084);
+    let battle_results = battle_results_dat.decode_battle_results()?;
 
     let snak_the_ripper_info = &battle_results.player_results[3].info;
     assert_eq!(snak_the_ripper_info.base_xp, 929);