diff --git a/test_swarmmetrics.py b/test_swarmmetrics.py
index 982a564..bfdf618 100644
--- a/test_swarmmetrics.py
+++ b/test_swarmmetrics.py
@@ -123,6 +123,59 @@ def test_f32_zombie_broadcast():
         f"F3.2 zombie fail: dialogue={dialogue.reciprocity_f32:.4f} <= broadcast={broadcast.reciprocity_f32:.4f}"
 
 
+def test_f33_zombie_broadcast_concepts():
+    """F3.3 unique-concept-count must crush spam even harder than F3.2.
+    100 pings with 2 concepts vs 5 messages with 5 concepts.
+    Idea from 小風 (ClawdChat): replace count with unique topic count."""
+    msgs = []
+    # 5-message dialogue, high reciprocity (3+2), 5 unique concepts
+    concepts_rich = [["graph", "reciprocity"], ["decay", "metrics"], ["shadow"],
+                     ["echo", "idf"], ["influence"]]
+    for i in range(3):
+        msgs.append({"from_id": "alice", "to_id": "bob",
+                     "timestamp": now - 1*day + i*100,
+                     "concepts": concepts_rich[i]})
+    for i in range(2):
+        msgs.append({"from_id": "bob", "to_id": "alice",
+                     "timestamp": now - 0.5*day + i*100,
+                     "concepts": concepts_rich[3+i]})
+    # 100 pings, low reciprocity (95+5), only 2 unique concepts (repeated)
+    for i in range(95):
+        msgs.append({"from_id": "carol", "to_id": "dave",
+                     "timestamp": now - 2*day + i*60,
+                     "concepts": ["hello", "ping"]})
+    for i in range(5):
+        msgs.append({"from_id": "dave", "to_id": "carol",
+                     "timestamp": now - 1.5*day + i*600,
+                     "concepts": ["hello"]})
+
+    edges = score_reciprocity(msgs, now=now)
+    dialogue = [e for e in edges.values() if "alice" in (e.source, e.target)][0]
+    broadcast = [e for e in edges.values() if "carol" in (e.source, e.target)][0]
+
+    # F3.3 must separate them
+    assert dialogue.reciprocity_f33 > broadcast.reciprocity_f33, \
+        (f"F3.3 zombie fail: dialogue={dialogue.reciprocity_f33:.4f} "
+         f"<= broadcast={broadcast.reciprocity_f33:.4f}")
+    # F3.3 spread should be wider than F3.2
+    f33_ratio = dialogue.reciprocity_f33 / max(broadcast.reciprocity_f33, 0.001)
+    f32_ratio = dialogue.reciprocity_f32 / max(broadcast.reciprocity_f32, 0.001)
+    assert f33_ratio > f32_ratio, \
+        f"F3.3 should separate more than F3.2: f33_ratio={f33_ratio:.1f} <= f32_ratio={f32_ratio:.1f}"
+
+
+def test_f33_fallback_no_concepts():
+    """F3.3 falls back to F3.2 when messages have no concepts."""
+    msgs = [
+        {"from_id": "a", "to_id": "b", "timestamp": now - 1*day},
+        {"from_id": "b", "to_id": "a", "timestamp": now - 0.5*day},
+    ]
+    edges = score_reciprocity(msgs, now=now)
+    edge = list(edges.values())[0]
+    assert edge.reciprocity_f33 == edge.reciprocity_f32, \
+        f"F3.3 should equal F3.2 with no concepts: f33={edge.reciprocity_f33}, f32={edge.reciprocity_f32}"
+
+
 def test_f32_idf_echo_combined():
     """F3.2 and IDF echo work together in full analyze()."""
     msgs = [