Also move `GetMaxAchievableCombo`

osu.Game/Scoring/ScoreInfoExtensions.cs

@@ -1,11 +1,10 @@
 // Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
 // See the LICENCE file in the repository root for full licence text.
 
-#nullable disable
-
 using System.Collections.Generic;
 using System.Linq;
 using osu.Game.Beatmaps;
+using osu.Game.Rulesets.Scoring;
 
 namespace osu.Game.Scoring
 {
@@ -26,5 +25,12 @@ public static IEnumerable<ScoreInfo> OrderByTotalScore(this IEnumerable<ScoreInf
                      .ThenBy(s => s.OnlineID)
                      // Local scores may not have an online ID. Fall back to date in these cases.
                      .ThenBy(s => s.Date);
+
+        /// <summary>
+        /// Retrieves the maximum achievable combo for the provided score.
+        /// </summary>
+        /// <param name="score">The <see cref="ScoreInfo"/> to compute the maximum achievable combo for.</param>
+        /// <returns>The maximum achievable combo.</returns>
+        public static int GetMaximumAchievableCombo(this ScoreInfo score) => score.MaximumStatistics.Where(kvp => kvp.Key.AffectsCombo()).Sum(kvp => kvp.Value);
     }
 }

osu.Game/Scoring/ScoreManager.cs

@@ -89,13 +89,6 @@ public ScoreInfo Query(Expression<Func<ScoreInfo, bool>> query)
         /// <returns>The bindable containing the formatted total score string.</returns>
         public Bindable<string> GetBindableTotalScoreString([NotNull] ScoreInfo score) => new TotalScoreStringBindable(GetBindableTotalScore(score));
 
-        /// <summary>
-        /// Retrieves the maximum achievable combo for the provided score.
-        /// </summary>
-        /// <param name="score">The <see cref="ScoreInfo"/> to compute the maximum achievable combo for.</param>
-        /// <returns>The maximum achievable combo.</returns>
-        public int GetMaximumAchievableCombo([NotNull] ScoreInfo score) => score.MaximumStatistics.Where(kvp => kvp.Key.AffectsCombo()).Sum(kvp => kvp.Value);
-
         /// <summary>
         /// Provides the total score of a <see cref="ScoreInfo"/>. Responds to changes in the currently-selected <see cref="ScoringMode"/>.
         /// </summary>

osu.Game/Screens/Ranking/Expanded/ExpandedPanelMiddleContent.cs

@@ -73,7 +73,7 @@ private void load(BeatmapDifficultyCache beatmapDifficultyCache)
             var topStatistics = new List<StatisticDisplay>
             {
                 new AccuracyStatistic(score.Accuracy),
-                new ComboStatistic(score.MaxCombo, scoreManager.GetMaximumAchievableCombo(score)),
+                new ComboStatistic(score.MaxCombo, score.GetMaximumAchievableCombo()),
                 new PerformanceStatistic(score),
             };