diff --git a/integraal/integraal-explanation/src/main/java/fr/boreal/explanation/tracker_gri/explainers/AbstractStaticGRIBasedExplainer_TrackerGRI.java b/integraal/integraal-explanation/src/main/java/fr/boreal/explanation/tracker_gri/explainers/AbstractStaticGRIBasedExplainer_TrackerGRI.java
index 2fdb5d0fca7cd927a217aa9eb96fd37b49b99374..55b6631803852d31cec3e356df511f34624c8d85 100644
--- a/integraal/integraal-explanation/src/main/java/fr/boreal/explanation/tracker_gri/explainers/AbstractStaticGRIBasedExplainer_TrackerGRI.java
+++ b/integraal/integraal-explanation/src/main/java/fr/boreal/explanation/tracker_gri/explainers/AbstractStaticGRIBasedExplainer_TrackerGRI.java
@@ -46,6 +46,22 @@ public abstract class AbstractStaticGRIBasedExplainer_TrackerGRI<ExplanationType
      */
     GRIRuleTransformer ruleTransformer = GRIRuleTransformer.instance();
     Predicate<Atom> belongsToInitialFactbase;
+    /**
+     * Sets the initial KB and compute the GRI
+     *
+     * @param inputKB the current kb
+     */
+    public AbstractStaticGRIBasedExplainer_TrackerGRI(KnowledgeBase inputKB) {
+        this.inputKB = inputKB;
+
+        this.intialAtoms = new HashSet<Atom>();
+        inputKB.getFactBase().getAtoms().forEach(intialAtoms::add);
+
+        var trackedChase = DefaultChaseForExplanations.chaseForTracker(this.inputKB);
+        this.griKBChase = trackedChase.chase();
+        this.griTracker = trackedChase.tracker();
+    }
+
     /**
      * Sets the initial KB and compute the GRI
      *
@@ -60,6 +76,7 @@ public abstract class AbstractStaticGRIBasedExplainer_TrackerGRI<ExplanationType
         var trackedChase = DefaultChaseForExplanations.chaseForTracker(this.inputKB);
         this.griKBChase = trackedChase.chase();
         this.griTracker = trackedChase.tracker();
+        this.solver=solver;
     }
 
     public void pipeline() {