diff --git a/2025/src/day09.clj b/2025/src/day09.clj
index 3a31edf..023eb79 100644
--- a/2025/src/day09.clj
+++ b/2025/src/day09.clj
@@ -38,14 +38,13 @@
 ;; part 2
 (->> largest-squares
      (filter (fn [[a b]]
-               (let [segments (filter (fn [[seg-a seg-b]] (and (not= a seg-a)
-                                                               (not= a seg-b)
-                                                               (not= b seg-a)
-                                                               (not= b seg-b)))
+               (let [segments (filter (fn overlapping? [[seg-a seg-b]]
+                                        (and (not= a seg-a) (not= a seg-b)
+                                             (not= b seg-a) (not= b seg-b))) ;; filter out segments that include points a or b
                                       line-segments)
                      [[cx cy] [dx dy]] [a b]]
                  (and (not (some #(intersect? [a b] %) segments))
-                      (not (some #(intersect? [[cx dy] [dx cy]] %) segments))))))
+                      (not (some #(intersect? [[cx dy] [dx cy]] %) segments)))))) ;; check reverse diaganol too
      (sort-by (partial apply area))
      last
      (apply area))