diff --git a/java/src/org/broadinstitute/sting/gatk/refdata/rodDbSNP.java b/java/src/org/broadinstitute/sting/gatk/refdata/rodDbSNP.java
index de148028b..5d9cda6a4 100644
--- a/java/src/org/broadinstitute/sting/gatk/refdata/rodDbSNP.java
+++ b/java/src/org/broadinstitute/sting/gatk/refdata/rodDbSNP.java
@@ -209,8 +209,7 @@ public class rodDbSNP extends BasicReferenceOrderedDatum implements AllelicVaria
 
 	@Override
 	public List<String> getGenotype() throws IllegalStateException {
-		// TODO Auto-generated method stub
-		return null;
+		return Arrays.asList(Utils.join("", getAllelesFWD()));
 	}
 
 	public double getMAF() {
diff --git a/java/src/org/broadinstitute/sting/gatk/refdata/rodVariants.java b/java/src/org/broadinstitute/sting/gatk/refdata/rodVariants.java
index 852f6db4d..6ce702957 100755
--- a/java/src/org/broadinstitute/sting/gatk/refdata/rodVariants.java
+++ b/java/src/org/broadinstitute/sting/gatk/refdata/rodVariants.java
@@ -113,7 +113,9 @@ public class rodVariants extends BasicReferenceOrderedDatum implements AllelicVa
     }
 
     public char getAltSnpFWD() throws IllegalStateException {
-        return (bestGenotype.charAt(0) == refBase) ? bestGenotype.charAt(1) : bestGenotype.charAt(0);
+        char c = (bestGenotype.charAt(0) == refBase) ? bestGenotype.charAt(1) : bestGenotype.charAt(0);
+        //System.out.printf("%s : %c and %c%n", bestGenotype, refBase, c);
+        return c;
     }
 
     public boolean isReference() {
diff --git a/java/src/org/broadinstitute/sting/playground/gatk/walkers/varianteval/VariantDBCoverage.java b/java/src/org/broadinstitute/sting/playground/gatk/walkers/varianteval/VariantDBCoverage.java
index 0124b5e47..340f06e50 100755
--- a/java/src/org/broadinstitute/sting/playground/gatk/walkers/varianteval/VariantDBCoverage.java
+++ b/java/src/org/broadinstitute/sting/playground/gatk/walkers/varianteval/VariantDBCoverage.java
@@ -22,23 +22,50 @@ public class VariantDBCoverage extends BasicVariantAnalysis implements GenotypeA
     private int nDBObs = 0;
     private int nEvalObs = 0;
     private int nOverlapping = 0;
+    private int nConcordant = 0;
 
     public VariantDBCoverage(final String name) {
         super("db_coverage");
         dbName = name;
     }
 
-    public void inc(boolean inDB, boolean inEval) {
+    public void inc(AllelicVariant dbSNP, AllelicVariant eval) {
+        boolean inDB = dbSNP != null;
+        boolean inEval = eval != null;
+
         if (inDB) nDBObs++;
         if (inEval) nEvalObs++;
-        if (inDB && inEval) nOverlapping++;
+        if (inDB && inEval) {
+            nOverlapping++;
+
+            if ( discordantP(dbSNP, eval) )
+                nConcordant++;
+        }
     }
 
     public int nDBSites()           { return nDBObs; }
     public int nEvalSites()         { return nEvalObs; }
     public int nOverlappingSites()  { return nOverlapping; }
+    public int nConcordant()        { return nConcordant; }
     public int nNovelSites()        { return Math.abs(nEvalSites() - nOverlappingSites()); }
 
+    public boolean discordantP(AllelicVariant dbSNP, AllelicVariant eval) {
+        if (dbSNP != null && dbSNP.isSNP() && eval != null ) {
+            boolean concordant = dbSNP.getAltSnpFWD() == eval.getAltSnpFWD() || dbSNP.getRefSnpFWD() == eval.getAltSnpFWD();
+
+            //System.out.printf("dbSNP=%s | %c, eval=%s | %c, concordant=%b %s %s%n",
+            //        dbSNP.getGenotype().get(0), dbSNP.getAltSnpFWD(),
+            //        eval.getGenotype().get(0), eval.getAltSnpFWD(),
+            //        concordant,
+            //        dbSNP, eval);
+
+            return ! concordant;
+        } else {
+            return false;
+        }
+    }
+
+
     /**
      * What fraction of the evaluated site variants were also found in the db?
      *
@@ -48,11 +75,16 @@ public class VariantDBCoverage extends BasicVariantAnalysis implements GenotypeA
         return nOverlappingSites() / (1.0 * nEvalSites());
     }
 
+    public double concordanceRate() {
+        return nConcordant() / (1.0 * nOverlappingSites());
+    }
+
     public String update(AllelicVariant eval, RefMetaDataTracker tracker, char ref, AlignmentContext context) {
         // There are four cases here:
         AllelicVariant dbsnp = (AllelicVariant)tracker.lookup(dbName, null);
-        inc(dbsnp != null, eval != null);
-        return dbsnp == null && eval != null ? "Novel " + eval : null;
+        boolean isSNP = dbsnp != null && dbsnp.isSNP();
+        inc(isSNP ? dbsnp : null, eval);
+        return ! isSNP && eval != null ? "Novel      " + eval : (discordantP(dbsnp, eval) ? (String.format("Discordant DBSNP=%s %s", dbsnp.getGenotype().get(0), eval)) : null);
     }
 
     /**
@@ -71,8 +103,10 @@ public class VariantDBCoverage extends BasicVariantAnalysis implements GenotypeA
         s.add(String.format("n_db_sites           %d", nDBSites()));
         s.add(String.format("n_eval_sites         %d", nEvalSites()));
         s.add(String.format("n_overlapping_sites  %d", nOverlappingSites()));
+        s.add(String.format("n_concordant         %d", nConcordant()));
         s.add(String.format("n_novel_sites        %d", nNovelSites()));
         s.add(String.format("per_eval_sites_in_db %.2f", 100*fractionEvalSitesCoveredByDB()));
+        s.add(String.format("concordance_rate     %.2f", 100*concordanceRate()));
         s.add(String.format("per_db_sites_in_eval %.2f", 100*fractionDBSitesDiscoveredInEval()));
         return s;
     }
diff --git a/java/src/org/broadinstitute/sting/playground/gatk/walkers/varianteval/VariantEvalWalker.java b/java/src/org/broadinstitute/sting/playground/gatk/walkers/varianteval/VariantEvalWalker.java
index 29f5c4d2b..9abbe05d3 100755
--- a/java/src/org/broadinstitute/sting/playground/gatk/walkers/varianteval/VariantEvalWalker.java
+++ b/java/src/org/broadinstitute/sting/playground/gatk/walkers/varianteval/VariantEvalWalker.java
@@ -30,8 +30,8 @@ import java.util.*;
 @Requires(DataSource.REFERENCE)
 @Allows(DataSource.REFERENCE)
 public class VariantEvalWalker extends RefWalker<Integer, Integer> {
-    @Argument(shortName="minDiscoveryQ", doc="Phred-scaled minimum LOD to consider an evaluation SNP a variant", required=false)
-    public int minDiscoveryQ = -1;
+    @Argument(shortName="minConfidenceScore", doc="Minimum confidence score to consider an evaluation SNP a variant", required=false)
+    public int minConfidenceScore = -1;
 
     @Argument(shortName="printVariants", doc="If true, prints the variants in all of the variant tracks that are examined", required=false)
     public boolean printVariants = false;
@@ -159,10 +159,10 @@ public class VariantEvalWalker extends RefWalker<Integer, Integer> {
         if ( eval != null ) {
             if ( evalContainsGenotypes ) {
                 // Genotyping - use best vs. next best lod
-                if ( eval.getConsensusConfidence() < minDiscoveryQ ) eval = null;
+                if ( eval.getConsensusConfidence() < minConfidenceScore ) eval = null;
             } else {
                 // Variant discovery - use best vs. reference lod
-                if ( Math.abs(eval.getVariationConfidence()) < minDiscoveryQ ) eval = null;
+                if ( Math.abs(eval.getVariationConfidence()) < minConfidenceScore ) eval = null;
             }
         }