diff --git a/utils/export_players.py b/utils/export_players.py
index b4d33d5..4685455 100644
--- a/utils/export_players.py
+++ b/utils/export_players.py
@@ -1,10 +1,84 @@
-from datetime import datetime
 import json
 import hashlib
 from typing import Callable
+from datetime import datetime
+from decimal import Decimal, getcontext
 
 SALT = b"Lt2N5xgjJOqRsT5qVt7wWYw6SqOPZDI7"
 
+with open("musicDB.json", "r", encoding="utf-8") as f:
+    music_db = json.load(f)
+
+music_db = {entry["id"]: entry for entry in music_db}
+
+# Set Decimal precision
+getcontext().prec = 28
+
+# Constants
+SSS_PLUS_THRESHOLD = Decimal("100.5")
+SSS_PLUS_FACTOR = Decimal("0.224")
+SSS_PRO_THRESHOLD = Decimal("100.4999")
+SSS_PRO_FACTOR = Decimal("0.222")
+SSS_THRESHOLD = Decimal("100.0")
+SSS_FACTOR = Decimal("0.216")
+SS_PLUS_PRO_THRESHOLD = Decimal("99.9999")
+SS_PLUS_PRO_FACTOR = Decimal("0.214")
+SS_PLUS_THRESHOLD = Decimal("99.5")
+SS_PLUS_FACTOR = Decimal("0.211")
+SS_THRESHOLD = Decimal("99.0")
+SS_FACTOR = Decimal("0.208")
+S_PLUS_PRO_THRESHOLD = Decimal("98.9999")
+S_PLUS_PRO_FACTOR = Decimal("0.206")
+S_PLUS_THRESHOLD = Decimal("98.0")
+S_PLUS_FACTOR = Decimal("0.203")
+S_THRESHOLD = Decimal("97.0")
+S_FACTOR = Decimal("0.2")
+AAA_PRO_THRESHOLD = Decimal("96.9999")
+AAA_PRO_FACTOR = Decimal("0.176")
+AAA_THRESHOLD = Decimal("94.0")
+AAA_FACTOR = Decimal("0.168")
+AA_THRESHOLD = Decimal("90.0")
+AA_FACTOR = Decimal("0.152")
+A_THRESHOLD = Decimal("80.0")
+A_FACTOR = Decimal("0.136")
+
+
+def dx_rating(difficulty: Decimal, achievement: int) -> int:
+    ach = Decimal(achievement) / Decimal("10000")
+    if ach > Decimal("101.0") or ach < A_THRESHOLD:
+        return 0
+    if ach >= SSS_PLUS_THRESHOLD:
+        factor = SSS_PLUS_FACTOR
+        ach = Decimal("100.5")
+    elif ach >= SSS_PRO_THRESHOLD:
+        factor = SSS_PRO_FACTOR
+    elif ach >= SSS_THRESHOLD:
+        factor = SSS_FACTOR
+    elif ach >= SS_PLUS_PRO_THRESHOLD:
+        factor = SS_PLUS_PRO_FACTOR
+    elif ach >= SS_PLUS_THRESHOLD:
+        factor = SS_PLUS_FACTOR
+    elif ach >= SS_THRESHOLD:
+        factor = SS_FACTOR
+    elif ach >= S_PLUS_PRO_THRESHOLD:
+        factor = S_PLUS_PRO_FACTOR
+    elif ach >= S_PLUS_THRESHOLD:
+        factor = S_PLUS_FACTOR
+    elif ach >= S_THRESHOLD:
+        factor = S_FACTOR
+    elif ach >= AAA_PRO_THRESHOLD:
+        factor = AAA_PRO_FACTOR
+    elif ach >= AAA_THRESHOLD:
+        factor = AAA_FACTOR
+    elif ach >= AA_THRESHOLD:
+        factor = AA_FACTOR
+    elif ach >= A_THRESHOLD:
+        factor = A_FACTOR
+    else:
+        return 0
+    result = (factor * difficulty * ach).quantize(Decimal("1."), rounding="ROUND_FLOOR")
+    return int(result)
+
 
 def salted_hash_userid(player: dict):
     uid = player["userId"]
@@ -12,6 +86,61 @@ def salted_hash_userid(player: dict):
     player["userId"] = hash_uid.hexdigest()[:16]
 
 
+def clean_b50(b50: dict[str, str | dict]):
+    urating: dict[str, list[dict[str, int]]] = b50["userRating"]
+
+    def add_rating(entry: dict[str, int]):
+        """
+        ```
+        {
+            "musicId": 11638,
+            "level": 2,
+            "romVersion": 24005,
+            "achievement": 988145
+        }
+        ```
+        - level: EXPERT
+        - ver: DX, 1.40.05
+        - ach: 98.8145%
+        """
+
+        entry["musicTitle"] = None
+        entry["difficulty"] = None
+        entry["dxRating"] = 0
+
+        music_info = music_db.get(entry["musicId"])
+        if music_info is None:
+            return
+
+        entry["musicTitle"] = music_info["name"]
+
+        levels = [
+            level for level in music_info["levels"] if level["level"] == entry["level"]
+        ]
+
+        if levels:
+            level: dict[str, str | int] = levels.pop()
+            difficulty = level["difficulty"]
+
+            entry["difficulty"] = difficulty
+            entry["dxRating"] = dx_rating(
+                difficulty=Decimal(difficulty),
+                achievement=entry["achievement"],
+            )
+
+    for b35 in urating["ratingList"]:
+        add_rating(b35)
+    for b15 in urating["newRatingList"]:
+        add_rating(b15)
+
+    urating["rating"] = sum(
+        map(
+            lambda lst: sum(map(lambda entry: entry["dxRating"], urating[lst])),
+            ["ratingList", "newRatingList"],
+        )
+    )
+
+
 def clean_player(player: dict):
     player.pop("isLogin")
     player.pop("lastLoginDate")
@@ -55,15 +184,17 @@ def process(
         json.dump(data, f, ensure_ascii=False)
     print(f"written out, cost {record_time():.2f}s")
 
+    return data
+
 
 def main():
+    # process(
+    #     clean_player,
+    #     "players.json",
+    #     "players_pub.json",
+    # )
     process(
-        clean_player,
-        "players.json",
-        "players_pub.json",
-    )
-    process(
-        lambda d: d["userRating"].pop("rating"),
+        clean_b50,
         "b50.json",
         "b50_pub.json",
     )