diff --git a/src/games/behavspt.cc b/src/games/behavspt.cc
index 2187124af..b7cef24f1 100644
--- a/src/games/behavspt.cc
+++ b/src/games/behavspt.cc
@@ -193,8 +193,9 @@ void BehaviorSupportProfile::AddAction(const GameAction &s)
   }
 
   List<GameNode> startlist(ReachableMembers(s->GetInfoset()));
-  for (int i = 1; i <= startlist.Length(); i++)
-    DeactivateSubtree(startlist[i]);
+  for (auto node : ReachableMembers(s->GetInfoset())) {
+    DeactivateSubtree(node);
+  }
 }
 
 int BehaviorSupportProfile::NumSequences(int j) const
@@ -434,7 +435,7 @@ bool BehaviorSupportProfile::Dominates(const GameAction &a, const GameAction &b,
 
   else {
     List<GameNode> nodelist = ReachableMembers(infoset);  
-    if (nodelist.Length() == 0) {
+    if (nodelist.empty()) {
       // This may not be a good idea; I suggest checking for this
       // prior to entry
       for (int i = 1; i <= infoset->NumMembers(); i++) {
diff --git a/src/games/gamebagg.h b/src/games/gamebagg.h
index d5c39e9df..1b3012ab3 100644
--- a/src/games/gamebagg.h
+++ b/src/games/gamebagg.h
@@ -81,7 +81,7 @@ class GameBagentRep : public GameRep {
   /// @name Players
   //@{
   /// Returns the number of players in the game
-  int NumPlayers() const override { return m_players.Length(); }
+  int NumPlayers() const override { return m_players.size(); }
   /// Returns the pl'th player in the game
   GamePlayer GetPlayer(int pl) const override { return m_players[pl]; }
   /// Returns the set of players in the game
diff --git a/src/games/gameexpl.h b/src/games/gameexpl.h
index b835d7e12..fc5215208 100644
--- a/src/games/gameexpl.h
+++ b/src/games/gameexpl.h
@@ -73,7 +73,7 @@ class GameExplicitRep : public GameRep {
   /// @name Players
   //@{
   /// Returns the number of players in the game
-  int NumPlayers() const override { return m_players.Length(); }
+  int NumPlayers() const override { return m_players.size(); }
   /// Returns the pl'th player in the game
   GamePlayer GetPlayer(int pl) const override { return m_players[pl]; }
   /// Returns the set of players in the game
@@ -83,7 +83,7 @@ class GameExplicitRep : public GameRep {
   /// @name Outcomes
   //@{
   /// Returns the number of outcomes defined in the game
-  int NumOutcomes() const override { return m_outcomes.Length(); }
+  int NumOutcomes() const override { return m_outcomes.size(); }
   /// Returns the index'th outcome defined in the game
   GameOutcome GetOutcome(int index) const override { return m_outcomes[index]; }
   /// Creates a new outcome in the game
diff --git a/src/games/nash.cc b/src/games/nash.cc
index ba54f0d12..e974012f5 100644
--- a/src/games/nash.cc
+++ b/src/games/nash.cc
@@ -210,8 +210,8 @@ BehavViaStrategySolver<T>::Solve(const BehaviorSupportProfile &p_support) const
 {
   List<MixedStrategyProfile<T> > output = m_solver->Solve(p_support.GetGame());
   List<MixedBehaviorProfile<T> > solutions;
-  for (int i = 1; i <= output.Length(); i++) {
-    solutions.push_back(MixedBehaviorProfile<T>(output[i]));
+  for (auto profile : output) {
+    solutions.push_back(MixedBehaviorProfile<T>(profile));
   }
   return solutions;
 }
@@ -290,7 +290,7 @@ void SubgameBehavSolver<T>::SolveSubgames(const BehaviorSupportProfile &p_suppor
     SolveSubgames(p_support, p_templateSolution,
 		  subroots[i], subsolns, subvalues);
     
-    if (subsolns.Length() == 0)  {
+    if (subsolns.empty())  {
       solns = List<DVector<T> >();
       return;
     }
@@ -360,7 +360,7 @@ void SubgameBehavSolver<T>::SolveSubgames(const BehaviorSupportProfile &p_suppor
 
     List<MixedBehaviorProfile<T> > sol = m_solver->Solve(subsupport);
     
-    if (sol.Length() == 0)  {
+    if (sol.empty())  {
       solns = List<DVector<T> >();
       //printf("No solutions found\n");
       return;
diff --git a/src/games/stratspt.h b/src/games/stratspt.h
index cf8fdf7af..c182f6487 100644
--- a/src/games/stratspt.h
+++ b/src/games/stratspt.h
@@ -78,7 +78,7 @@ class StrategySupportProfile {
   Game GetGame() const { return m_nfg; }
 
   /// Returns the number of strategies in the support for player pl.
-  int NumStrategies(int pl) const  { return m_support[pl].Length(); }
+  int NumStrategies(int pl) const  { return m_support[pl].size(); }
 
   /// Returns the number of strategies in the support for all players.
   Array<int> NumStrategies() const;
diff --git a/src/solvers/linalg/lptab.imp b/src/solvers/linalg/lptab.imp
index 45b8557e7..ec784ca69 100644
--- a/src/solvers/linalg/lptab.imp
+++ b/src/solvers/linalg/lptab.imp
@@ -395,7 +395,7 @@ void LPTableau<T>::ReversePivots(List<Array<int> > &PivotList)
     // gout << "\nafter checking cols, BestSet = ";
     // BestSet.Dump(gout);
 
-    if(BestSet.Length()>0) 
+    if (!BestSet.empty())
       for(i=1;i<=BestSet.Length();i++) {
 	pivot[1] = BestSet[i];
 	pivot[2] = j;