diff --git a/edge/src/names.rs b/edge/src/names.rs
index f00d9d7..b92dd20 100644
--- a/edge/src/names.rs
+++ b/edge/src/names.rs
@@ -524,7 +524,13 @@ pub fn release_identity(poster: &str, subject: &str, name: &str) -> Release {
     }
     let image = test(&IMAGE, name);
     // The poster's constant tag outside the quotes: the file's stem says which upload it is (not for images and audio).
-    let tag = !image && !test(&AUDIO, name) && describes(&stem) && !looks_random(&stem) && is_poster_tag(&remainder, &stem);
+    // Not for numbered items of a set ("003 Defining Tools with JSON Schema.mp4"): /^\d{1,3}[ ._-]/.
+    let numbered = {
+        let b = stem.as_bytes();
+        let digits = b.iter().take_while(|c| c.is_ascii_digit()).count();
+        (1..=3).contains(&digits) && matches!(b.get(digits), Some(b' ' | b'.' | b'_' | b'-'))
+    };
+    let tag = !image && !numbered && !test(&AUDIO, name) && describes(&stem) && !looks_random(&stem) && is_poster_tag(&remainder, &stem);
     let prefix = if image { image_prefix(&stem) } else { String::new() };
     if !tag && names_release(&remainder) {
         let bound = counter_total(subject).unwrap_or_else(|| prefix.clone());
@@ -1004,4 +1010,18 @@ mod tests {
         assert_eq!(upload_tool("b94268bc702040f7b811d5318f727e4f@ngPost"), "ngPost");
         assert_eq!(upload_tool("x@y"), "other");
     }
+
+#[cfg(test)]
+mod numbered_tests {
+    use super::release_identity;
+
+    #[test]
+    fn numbered_items_of_a_set_stay_one_release() {
+        let poster = "Poster49118 <Poster49118@generic.mail>";
+        let a = release_identity(poster, r#"ai-engineer-complete [401/465] - "003 Defining Tools with JSON Schema.mp4" yEnc"#, "003 Defining Tools with JSON Schema.mp4");
+        let b = release_identity(poster, r#"ai-engineer-complete [422/465] - "006 ai-lesson-4-5-web-search-tools.zip" yEnc"#, "006 ai-lesson-4-5-web-search-tools.zip");
+        assert_eq!(a.key, b.key);
+        assert_eq!(a.name, "ai engineer complete");
+    }
+}
 }
diff --git a/lib/release/identity.ts b/lib/release/identity.ts
index ff4cb1d..a3d8b69 100644
--- a/lib/release/identity.ts
+++ b/lib/release/identity.ts
@@ -209,8 +209,11 @@ export function releaseIdentity(input: ReleaseInput): ReleaseIdentity | null {
   // release the file is (LOG.md 2026-10-09 (8)). Only when the stem itself describes something
   // ("Cephalgy.-.Weisses.Fleisch.2003", not a scene abbreviation like "grp-sm" under
   // "Some.Movie.2008-GRP", nor "file_id.diz"), and not for images and audio tracks, which the
-  // subject names as a set or album ("IMG_3086.jpg", "072 - Die Teufelsuhr.MP3").
-  const tag = !image && !AUDIO.test(input.name) && describes(stem) && !looksRandom(stem) && isPosterTag(remainder, stem)
+  // subject names as a set or album ("IMG_3086.jpg", "072 - Die Teufelsuhr.MP3"), nor for numbered items of
+  // a set ("ai-engineer-complete [401/465] - "003 Defining Tools with JSON Schema.mp4"": a course's 465
+  // lessons were releases of their own; LOG.md 2026-10-11 (7)). Uploads hours apart are apart anyway.
+  const numbered = /^\d{1,3}[ ._-]/.test(stem)
+  const tag = !image && !numbered && !AUDIO.test(input.name) && describes(stem) && !looksRandom(stem) && isPosterTag(remainder, stem)
   // An image set without a counter: the image's name up to its last number, without numbers
   // ("Kitchen Hottie 1 set233-76-lg" → "Kitchen Hottie set", "bm_jessica_blb_h087" → "bm jessica blb h").
   const prefix = image ? stem.replace(/\d+\D*$/, '').replace(/\d+/g, ' ').replace(/[\s._-]+/g, ' ').trim() : ''
diff --git a/tests/unit/release/identity.spec.ts b/tests/unit/release/identity.spec.ts
index 7d09724..3613535 100644
--- a/tests/unit/release/identity.spec.ts
+++ b/tests/unit/release/identity.spec.ts
@@ -175,6 +175,14 @@ test.group('release / par2 names', () => {
     assert.equal(par2ReleaseName(['Album.Name-2024-GRP.part01.rar', 'Album.Name-2024-GRP.part02.rar']), 'Album.Name-2024-GRP')
     assert.equal(par2ReleaseName(['only.one.file.2024.mkv']), 'only.one.file.2024')
   })
+  test('numbered items of a set stay one release under the set name (a course, not a poster tag)', ({ assert }) => {
+    const id = (subject: string, name: string) => releaseIdentity({ poster: 'Poster49118 <Poster49118@generic.mail>', subject, name, weak: false })!
+    const a = id('ai-engineer-complete [401/465] - "003 Defining Tools with JSON Schema.mp4" yEnc', '003 Defining Tools with JSON Schema.mp4')
+    const b = id('ai-engineer-complete [422/465] - "006 ai-lesson-4-5-web-search-tools.zip" yEnc', '006 ai-lesson-4-5-web-search-tools.zip')
+    assert.equal(a.key, b.key)
+    assert.equal(a.name, 'ai engineer complete')
+  })
+
   test("a poster's constant tag doesn't make one release of all their uploads", ({ assert }) => {
     const id = (poster: string, subject: string, name: string) => releaseIdentity({ poster, subject, name, weak: false })!
     // [KiLL…] tag on every upload: each album by its stem, its nfo included.