diff --git a/tests/test_qa_quality_live.py b/tests/test_qa_quality_live.py
index b633a31..57c0632 100644
--- a/tests/test_qa_quality_live.py
+++ b/tests/test_qa_quality_live.py
@@ -141,6 +141,24 @@ def test_mona_lisa_grounded_and_names_leonardo():
         f"answer missing 'Leonardo': {_answer_lower(r)[:200]}"
 
 
+# ---------------------------------------------------------------- retrieval disambiguation
+
+
+def test_red_fish_blue_fish_identifies_seuss_book():
+    """Stress-tests retrieval disambiguation: "red fish blue fish" partially
+    matches many noise titles (Red Dwarf, Blue whale, Toronto Blue Jays,
+    Red Sea, Detroit Red Wings, marine aquarium fish list...). The right
+    answer is the Dr. Seuss book ``One Fish Two Fish Red Fish Blue Fish``.
+    The model should anchor on the Seuss article and the answer should
+    contain a Seuss-specific token."""
+    r = _ask("plot of red fish blue fish?")
+    assert _grounded(r), f"audit_mode={r.get('audit_mode')!r}"
+    txt = _answer_lower(r)
+    seuss_markers = ("seuss", "rhyming", "children's book", "creatures")
+    assert any(m in txt for m in seuss_markers), \
+        f"answer missing Seuss-book markers: {txt[:300]}"
+
+
 # ---------------------------------------------------------------- entity disambiguation