diff --git a/src/js/graph/treeCompare.js b/src/js/graph/treeCompare.js
index bef1ee71..716704b1 100644
--- a/src/js/graph/treeCompare.js
+++ b/src/js/graph/treeCompare.js
@@ -74,6 +74,8 @@ TreeCompare.dispatchShallow = function(levelBlob, goalTreeString, treeToCompare)
       return TreeCompare.compareBranchesWithinTreesHashAgnostic(
         treeToCompare, goalTreeString, ['main']
       ) && TreeCompare.evalAsserts(treeToCompare, levelBlob.goalAsserts);
+    case !!levelBlob.onlyEvaluateAsserts:
+      return TreeCompare.evalAsserts(treeToCompare, levelBlob.goalAsserts);
     default:
       return TreeCompare.compareAllBranchesWithinTreesAndHEAD(
         treeToCompare, goalTreeString
@@ -233,11 +235,14 @@ TreeCompare.evalAssertsOnBranch = function(tree, branchName, asserts) {
   var branch = tree.branches[branchName];
   var queue = [branch.target];
   var data = {};
+  var numCommits = 0;
   while (queue.length) {
     var commitRef = queue.pop();
     data[this.getBaseRef(commitRef)] = this.getNumHashes(commitRef);
     queue = queue.concat(tree.commits[commitRef].parents);
+    numCommits++;
   }
+  data['__num_commits_upstream'] = numCommits;
 
   var result = true;
   asserts.forEach(function(assert) {
@@ -245,7 +250,6 @@ TreeCompare.evalAssertsOnBranch = function(tree, branchName, asserts) {
       result = result && assert(data);
     } catch (err) {
       console.warn('error during assert', err);
-      console.log(err);
       result = false;
     }
   });
diff --git a/src/levels/mixed/describe.js b/src/levels/mixed/describe.js
index afe77305..bf780175 100644
--- a/src/levels/mixed/describe.js
+++ b/src/levels/mixed/describe.js
@@ -2,6 +2,14 @@ exports.level = {
   "goalTreeString": "{\"branches\":{\"main\":{\"target\":\"C2\",\"id\":\"main\",\"remoteTrackingBranchID\":null},\"side\":{\"target\":\"C4\",\"id\":\"side\",\"remoteTrackingBranchID\":null},\"bugFix\":{\"target\":\"C7\",\"id\":\"bugFix\",\"remoteTrackingBranchID\":null}},\"commits\":{\"C0\":{\"parents\":[],\"id\":\"C0\",\"rootCommit\":true},\"C1\":{\"parents\":[\"C0\"],\"id\":\"C1\"},\"C2\":{\"parents\":[\"C1\"],\"id\":\"C2\"},\"C3\":{\"parents\":[\"C1\"],\"id\":\"C3\"},\"C4\":{\"parents\":[\"C3\"],\"id\":\"C4\"},\"C5\":{\"parents\":[\"C3\"],\"id\":\"C5\"},\"C6\":{\"parents\":[\"C5\"],\"id\":\"C6\"},\"C7\":{\"parents\":[\"C6\"],\"id\":\"C7\"}},\"tags\":{\"v0\":{\"target\":\"C0\",\"id\":\"v0\",\"type\":\"tag\"},\"v1\":{\"target\":\"C3\",\"id\":\"v1\",\"type\":\"tag\"}},\"HEAD\":{\"target\":\"bugFix\",\"id\":\"HEAD\"}}",
   "solutionCommand": "git commit ",
   "startTree": "{\"branches\":{\"main\":{\"target\":\"C2\",\"id\":\"main\",\"remoteTrackingBranchID\":null},\"side\":{\"target\":\"C4\",\"id\":\"side\",\"remoteTrackingBranchID\":null},\"bugFix\":{\"target\":\"C6\",\"id\":\"bugFix\",\"remoteTrackingBranchID\":null}},\"commits\":{\"C0\":{\"parents\":[],\"id\":\"C0\",\"rootCommit\":true},\"C1\":{\"parents\":[\"C0\"],\"id\":\"C1\"},\"C2\":{\"parents\":[\"C1\"],\"id\":\"C2\"},\"C3\":{\"parents\":[\"C1\"],\"id\":\"C3\"},\"C4\":{\"parents\":[\"C3\"],\"id\":\"C4\"},\"C5\":{\"parents\":[\"C3\"],\"id\":\"C5\"},\"C6\":{\"parents\":[\"C5\"],\"id\":\"C6\"}},\"tags\":{\"v0\":{\"target\":\"C0\",\"id\":\"v0\",\"type\":\"tag\"},\"v1\":{\"target\":\"C3\",\"id\":\"v1\",\"type\":\"tag\"}},\"HEAD\":{\"target\":\"bugFix\",\"id\":\"HEAD\"}}",
+  "onlyEvaluateAsserts": true,
+  "goalAsserts": {
+    "bugfix": [
+      function (data) {
+        return data.__num_commits_upstream > 5;
+      },
+    ]
+  },
   "name": {
     "en_US": "Git Describe",
     "fr_FR": "Git describe",