diff --git a/eo/src/es/eoEsLocalXover.h b/eo/src/es/eoEsStandardXover.h
similarity index 75%
rename from eo/src/es/eoEsLocalXover.h
rename to eo/src/es/eoEsStandardXover.h
index bcf1c855..df7c2374 100644
--- a/eo/src/es/eoEsLocalXover.h
+++ b/eo/src/es/eoEsStandardXover.h
@@ -36,13 +36,14 @@
 // needs a selector - here random
 #include <eoRandomSelect.h>
 
-/** Local (i.e. std eoBinOp) crossover operator for ES genotypes.
+/** Standard (i.e. eoBinOp) crossover operator for ES genotypes.
  *  Uses some Atom crossovers to handle both the object variables
  *  and the mutation strategy parameters
- * It is an eoGenOp and not an eoBinOp for consistency with the global version
+ *  It is an  eoBinOp and has to be wrapped into an eoGenOp before being used
+ *  like the global version
  */
 template<class EOT> 
-class eoEsLocalXover: public eoGenOp<EOT>
+class eoEsStandardXover: public eoBinOp<EOT>
 {
 public:
   typedef typename EOT::Fitness FitT;
@@ -50,36 +51,25 @@ public:
   /**
    * (Default) Constructor.
    */
-  eoEsLocalXover(eoBinOp<double> & _crossObj, eoBinOp<double> & _crossMut) :
+  eoEsStandardXover(eoBinOp<double> & _crossObj, eoBinOp<double> & _crossMut) :
     crossObj(_crossObj), crossMut(_crossMut) {}
 
   /// The class name. Used to display statistics
-  virtual string className() const { return "eoEsLocalXover"; }
-
-  /// The TOTAL number of offspring (here = nb of parents modified in place)
-  unsigned max_production(void) { return 1; }
+  virtual string className() const { return "eoEsStandardXover"; }
 
   /**
    * modifies one parents in the populator
    *     using a second parent
-   *
-   * @param _pop a POPULATOR (not a simple population)
    */
-  void apply(eoPopulator<EOT>& _plop)
-  {
-    // First, select as many parents as you will have offspring
-    EOT& parent1 = *_plop; // select the first parent
-    const EOT& parent2 = sel(_plop.source()); // and the second, randomly
-    
+  bool operator()(EOT& _eo1, const EOT& _eo2)
+    {
     // first, the object variables
-    for (unsigned i=0; i<parent1.size(); i++)
+    for (unsigned i=0; i<_eo1.size(); i++)
       {
-	crossObj(parent1[i], parent2[i]); // apply eoBinOp
+	crossObj(_eo1[i], _eo2[i]); // apply eoBinOp
       }
     // then the self-adaptation parameters
-    cross_self_adapt(parent1, parent2);
-    // dont' forget to invalidate
-    parent1.invalidate();
+    cross_self_adapt(_eo1, _eo2);
   }
   
 private:
diff --git a/eo/src/es/eoEsStdevXOver.h b/eo/src/es/eoEsStdevXOver.h
deleted file mode 100644
index aac1e9a6..00000000
--- a/eo/src/es/eoEsStdevXOver.h
+++ /dev/null
@@ -1,80 +0,0 @@
-// -*- mode: c++; c-indent-level: 4; c++-member-init-indent: 8; comment-column: 35; -*-
-
-//-----------------------------------------------------------------------------
-// eoEsStdevXOver.h
-// (c) GeNeura Team, 2000 - Maarten Keijzer 2000 - Marc Schoenauer 2001
-/* 
-    This library is free software; you can redistribute it and/or
-    modify it under the terms of the GNU Lesser General Public
-    License as published by the Free Software Foundation; either
-    version 2 of the License, or (at your option) any later version.
-
-    This library is distributed in the hope that it will be useful,
-    but WITHOUT ANY WARRANTY; without even the implied warranty of
-    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-    Lesser General Public License for more details.
-
-    You should have received a copy of the GNU Lesser General Public
-    License along with this library; if not, write to the Free Software
-    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
-
-    Contact: todos@geneura.ugr.es, http://geneura.ugr.es
-             Marc.Schoenauer@polytechnique.fr
-             mak@dhi.dk
- */
-//-----------------------------------------------------------------------------
-
-#ifndef _eoEsStdevXOver_h
-#define _eoEsStdevXOver_h
-
-#include <es/eoEsStdev.h>
-#include <es/eoRealOp.h>
-
-/**
-\ingroup EvolutionStrategies
-
-Crossover for Evolutionary strategie style representation,
-    supporting co-evolving standard deviations.
-
-Simply calls a crossover for the object variables,
-    and a crossover for teh StdDev
-*/
-
-template <class EOT>
-class eoEsStdevXOver : public eoQuadOp<EOT>
-{
-public :
-  eoEsStdevXOver(eoQuadOp<vector<double> > & _objectXOver,
-		 eoQuadOp<vector<double> > & _stdDevXOver) :
-    objectXOver(_objectXOver), stdDevXOver(_stdDevXOver) {}
-
-  virtual std::string className(void) const { return "eoEsStdevXOver"; }
-
-  bool operator()(EOT & _eo1, EOT & _eo2)
-  {
-    bool objectChanged = objectXOver(_eo1, _eo2); // as vector<double>
-    bool stdDevChanged = stdDevXOver(_eo1.stdevs, _eo2.stdevs);
-
-    return objectChanged;
-  }
-
-private:
-  eoQuadOp<vector<double> > & objectXOver;
-  eoQuadOp<vector<double> > & stdDevXOver;
-};
-
-/* A question: it seems it really makes no difference to have 
-     as template the fitness (and use eoEsStdev<FitT> where you need EOs) or
-     directly the EOT itself. But of course if the EOT you use does not have
-     a stdev public member the compiler will crash.
-   There is a difference, however, in the calling instruction, because in 
-     on case you have to write eoEsStdevXOver<double> whereas otherwise you
-     simply write eoEsStdevXOver<Indi> (if Indi has been typedef'ed correctly).
-   So to keep everything (or almost :-) in the main program templatized 
-     with the Indi i've kept here the EOT template. 
-
-Are there arguments against that???
-MS - Marc.Schoenauer@polytechnique.fr
-*/
-
-#endif