diff --git a/java/src/org/broadinstitute/sting/playground/gatk/walkers/DeNovoSNPWalker.java b/java/src/org/broadinstitute/sting/playground/gatk/walkers/DeNovoSNPWalker.java
new file mode 100755
index 000000000..690610f59
--- /dev/null
+++ b/java/src/org/broadinstitute/sting/playground/gatk/walkers/DeNovoSNPWalker.java
@@ -0,0 +1,67 @@
+package org.broadinstitute.sting.playground.gatk.walkers;
+
+import org.broadinstitute.sting.gatk.walkers.*;
+import org.broadinstitute.sting.gatk.refdata.*;
+import org.broadinstitute.sting.gatk.contexts.ReferenceContext;
+import org.broadinstitute.sting.gatk.contexts.AlignmentContext;
+import org.broadinstitute.sting.utils.GenotypeUtils;
+
+import java.util.List;
+import java.util.Collection;
+
+/**
+ * Created by IntelliJ IDEA.
+ * User: andrewk
+ * Date: Sep 1, 2009
+ * Time: 11:04:55 AM
+ * To change this template use File | Settings | File Templates.
+ */
+@By(DataSource.REFERENCE)
+@Requires(value={DataSource.REFERENCE},referenceMetaData={@RMD(name="child",type= AllelicVariant.class), @RMD(name="parent1",type= AllelicVariant.class), @RMD(name="parent2",type= AllelicVariant.class)})
+//@Allows(value={DataSource.REFERENCE},referenceMetaData = {@RMD(name="eval",type=AllelicVariant.class), @RMD(name="dbsnp",type=AllelicVariant.class),@RMD(name="hapmap-chip",type=AllelicVariant.class), @RMD(name="interval",type=IntervalRod.class)})
+//@Allows(value={DataSource.REFERENCE},referenceMetaData = {@RMD(name="dbsnp",type=AllelicVariant.class)})
+public class DeNovoSNPWalker extends RefWalker<String, Integer>{
+
+    public String map(RefMetaDataTracker tracker, ReferenceContext ref, AlignmentContext context) {
+        AllelicVariant child = (AllelicVariant)tracker.lookup("child", null);
+        AllelicVariant parent1 = (AllelicVariant)tracker.lookup("parent1", null);
+        AllelicVariant parent2 = (AllelicVariant)tracker.lookup("parent2", null);
+        AllelicVariant dbsnp = (AllelicVariant)tracker.lookup("dbSNP", null);
+        if (child != null && parent1 != null && parent2 != null) {
+            if (child.isSNP() &&
+                child.getVariationConfidence() > 5 && // BTR > 5
+                parent1.isReference() &&
+                parent1.getConsensusConfidence() > 5 &&
+                parent2.isReference() && 
+                parent2.getConsensusConfidence() > 5
+                ) {
+
+                double sumConfidences = 0.5 * (0.5 * child.getVariationConfidence() + Math.min(parent1.getConsensusConfidence(), parent2.getConsensusConfidence()));
+
+                out.format("%s\t", child.getLocation().getContig());
+                out.format("%s\t", child.getLocation().getStart());
+                out.format("%.4f\t", sumConfidences);
+                out.format("%.4f\t", child.getVariationConfidence());
+                out.format("%.4f\t", parent1.getConsensusConfidence());
+                out.format("%.4f\t", parent2.getConsensusConfidence());
+                out.format("%s\t", dbsnp != null);
+
+                out.format ("%s\t", child.toString());
+                out.format ("%s\t", parent1.toString());
+                out.format ("%s", parent2.toSimpleString());
+                if (dbsnp != null)
+                    out.format ("\tDBSNP\t:%s", dbsnp.toString());
+                out.println();
+            }
+        }
+
+        return "";
+    }
+
+    public Integer reduceInit() { return 0; }
+    public Integer reduce(String line, Integer a) {
+        return 1;
+    }
+
+
+}