diff --git a/src/games/game.cc b/src/games/game.cc
index 3a9c7d941..601130d14 100644
--- a/src/games/game.cc
+++ b/src/games/game.cc
@@ -21,6 +21,7 @@
 //
 
 #include <iostream>
+#include <numeric>
 
 #include "gambit.h"
 #include "gametree.h"
@@ -568,21 +569,19 @@ GameStrategy GameExplicitRep::GetStrategy(int p_index) const
 int GameExplicitRep::NumStrategyContingencies() const
 {
   const_cast<GameExplicitRep *>(this)->BuildComputedValues();
-  int ncont = 1;
-  for (auto player : m_players) {
-    ncont *= player->m_strategies.size();
-  }
-  return ncont;
+  return std::accumulate(
+          m_players.begin(), m_players.end(), 1,
+          [](int ncont, GamePlayerRep *p) { return ncont * p->m_strategies.size(); }
+  );
 }
 
 int GameExplicitRep::MixedProfileLength() const
 {
   const_cast<GameExplicitRep *>(this)->BuildComputedValues();
-  int strats = 0;
-  for (auto player : m_players) {
-    strats += player->m_strategies.size();
-  }
-  return strats;
+  return std::accumulate(
+          m_players.begin(), m_players.end(), 0,
+          [](int size, GamePlayerRep *p) { return size + p->m_strategies.size(); }
+  );
 }
 
 
diff --git a/src/games/gametree.h b/src/games/gametree.h
index 3eba4642c..af0075396 100644
--- a/src/games/gametree.h
+++ b/src/games/gametree.h
@@ -101,7 +101,7 @@ class GameTreeInfosetRep : public GameInfosetRep {
   /// @name Actions
   //@{
   /// Returns the number of actions available at the information set
-  int NumActions() const override { return m_actions.Length(); }
+  int NumActions() const override { return m_actions.size(); }
   /// Returns the p_index'th action at the information set
   GameAction GetAction(int p_index) const override { return m_actions[p_index]; }
   /// Returns a forward iterator over the available actions
@@ -109,7 +109,7 @@ class GameTreeInfosetRep : public GameInfosetRep {
   //  { return GameActionIterator(m_actions); }
   //@}
 
-  int NumMembers() const override { return m_members.Length(); }
+  int NumMembers() const override { return m_members.size(); }
   GameNode GetMember(int p_index) const override;
 
   bool Precedes(GameNode) const override;
@@ -160,13 +160,13 @@ class GameTreeNodeRep : public GameNodeRep {
   int NumberInInfoset() const override
   { return infoset->m_members.Find(const_cast<GameTreeNodeRep *>(this)); }
 
-  int NumChildren() const override    { return children.Length(); }
+  int NumChildren() const override    { return children.size(); }
 
   GameInfoset GetInfoset() const override   { return infoset; }
   void SetInfoset(GameInfoset) override;
   GameInfoset LeaveInfoset() override;
 
-  bool IsTerminal() const override { return (children.Length() == 0); }
+  bool IsTerminal() const override { return children.empty(); }
   GamePlayer GetPlayer() const override
     { return (infoset) ? infoset->GetPlayer() : nullptr; }
   GameAction GetPriorAction() const override; // returns null if root node
diff --git a/src/games/mixed.h b/src/games/mixed.h
index 433e2871d..520db1ae2 100644
--- a/src/games/mixed.h
+++ b/src/games/mixed.h
@@ -220,7 +220,7 @@ template <class T> class MixedStrategyProfile {
   void Randomize(int p_denom) { m_rep->Randomize(p_denom); }
 
   /// Returns the total number of strategies in the profile
-  int MixedProfileLength() const { return m_rep->m_probs.Length(); }
+  int MixedProfileLength() const { return m_rep->m_probs.size(); }
 
   /// Converts the profile to one on the full support of the game
   MixedStrategyProfile<T> ToFullSupport() const;