diff --git a/prism/src/explicit/PrismSTPGAbstractRefine.java b/prism/src/explicit/PrismSTPGAbstractRefine.java
index 1a61c4d4..71539239 100644
--- a/prism/src/explicit/PrismSTPGAbstractRefine.java
+++ b/prism/src/explicit/PrismSTPGAbstractRefine.java
@@ -108,8 +108,10 @@ public class PrismSTPGAbstractRefine extends STPGAbstractRefine
 			throw new PrismException("Unknown label \"" + targetLabel + "\"");
 
 		// If the 'exact' flag is set, just do model checking on the concrete model (no abstraction)
-		if (exact)
+		if (exact) {
 			doExactModelChecking();
+			throw new PrismException("Terminated early after exact verification");
+		}
 
 		// Build a mapping between concrete/abstract states
 		// Initial abstract states: 0: initial, 1: target, 2:rest
@@ -367,6 +369,19 @@ public class PrismSTPGAbstractRefine extends STPGAbstractRefine
 		case CTMC:
 			break;
 		case MDP:
+			MDPModelChecker mcTmp = new MDPModelChecker();
+			mcTmp.inheritSettings(mcOptions);
+			switch (propertyType) {
+			case PROB_REACH:
+				res = mcTmp.probReach((MDP) modelConcrete, targetConcrete, min);
+				break;
+			case PROB_REACH_BOUNDED:
+				break;
+			case EXP_REACH:
+				break;
+			default:
+				throw new PrismException("Property type " + propertyType + " not supported");
+			}
 			break;
 		default:
 			String s = "Cannot do exact model checking for";
@@ -382,6 +397,15 @@ public class PrismSTPGAbstractRefine extends STPGAbstractRefine
 		mainLog.println();
 	}
 
+	// Override this to also print out concrete model details at the end
+	
+	@Override
+	protected void printFinalSummary(String initAbstractionInfo, boolean canRefine)
+	{
+		mainLog.println("\nConcrete " + modelType + ": " + modelConcrete.infoString());
+		super.printFinalSummary(initAbstractionInfo, canRefine);
+	}
+	
 	public static void main(String args[])
 	{
 		PrismSTPGAbstractRefine abstractRefine;
diff --git a/prism/src/explicit/STPGAbstractRefine.java b/prism/src/explicit/STPGAbstractRefine.java
index 190924b6..69d97d31 100644
--- a/prism/src/explicit/STPGAbstractRefine.java
+++ b/prism/src/explicit/STPGAbstractRefine.java
@@ -1010,10 +1010,10 @@ public abstract class STPGAbstractRefine
 			if (sanityChecks && (lbStrat.isEmpty() || ubStrat.isEmpty()))
 				throw new PrismException("Empty strategy generated for state " + refineState);
 			// Check if lb/ub are identical (just use equals() since lists are sorted)
-			if (lbStrat.equals(ubStrat)) {
+			if (lbStrat.equals(ubStrat) && lbStrat.size() == abstraction.getNumChoices(refineState)) {
 				if (verbosity >= 1)
 					mainLog.println("Warning: Skipping refinement of #" + refineState
-							+ " for which lb/ub strategy sets are equal.");
+							+ " for which lb/ub strategy sets are equal and covering.");
 				return 1;
 			}
 			if (verbosity >= 1)
@@ -1028,8 +1028,10 @@ public abstract class STPGAbstractRefine
 				} else {
 					ubStrat.removeAll(lbStrat);
 				}
-				choiceLists.add(lbStrat);
-				choiceLists.add(ubStrat);
+				if (!lbStrat.isEmpty())
+					choiceLists.add(lbStrat);
+				if (!ubStrat.isEmpty())
+					choiceLists.add(ubStrat);
 				break;
 			case 2:
 				// Remove intersection of lb/ub from both