diff --git a/MyIA.AI.Notebooks/GameTheory/GameTheory-15-CooperativeGames-Csharp.ipynb b/MyIA.AI.Notebooks/GameTheory/GameTheory-15-CooperativeGames-Csharp.ipynb
index 3f2db3ce96..8e52693464 100644
--- a/MyIA.AI.Notebooks/GameTheory/GameTheory-15-CooperativeGames-Csharp.ipynb
+++ b/MyIA.AI.Notebooks/GameTheory/GameTheory-15-CooperativeGames-Csharp.ipynb
@@ -206,7 +206,7 @@
     "\n",
     "### Énumération des coalitions\n",
     "\n",
-    "L'ensemble des coalitions = le **powerset** de `N` (`2^n` coalitions). On l'énumère via les **bitmasks** de `0` à `2^n − 1`.\n",
+    "L'ensemble des coalitions = le **powerset** de `N` (`2^n` coalitions). On l'énumère via les **bitmasks** de `0` à `2^n − 1` : le joueur `i` occupe le `i`-ème bit du masque `m`, si bien que `m & (1 << i) ≠ 0` signifie `i ∈ S`, et que les `2^n` valeurs de `m` parcourent exactement le powerset.\n",
     "\n",
     "### Propriétés\n",
     "\n",
diff --git a/scripts/notebook_tools/twin_pairs.d/gametheory-15-cooperativegames/0013-2026-09-21-myia-po-2025-CoursIA.yaml b/scripts/notebook_tools/twin_pairs.d/gametheory-15-cooperativegames/0013-2026-09-21-myia-po-2025-CoursIA.yaml
new file mode 100644
index 0000000000..6e6c6033a4
--- /dev/null
+++ b/scripts/notebook_tools/twin_pairs.d/gametheory-15-cooperativegames/0013-2026-09-21-myia-po-2025-CoursIA.yaml
@@ -0,0 +1,6 @@
+date: '2026-09-21'
+by: myia-po-2025:CoursIA
+python_sha: 4f795d52b28c6704651d6ab072480265f20fdc77
+csharp_sha: 8e5269346450696c84d5e7d334da881b53b75608
+content_python_sha: a75f50b8b56033dd423e18180a947e9d10127824c8e10b4f7b505d05b4209543
+content_csharp_sha: 8704a7b1bc6f07d1ce59dca8a5661ac3b21ba99329a0eab2105853e4b3ce1b6d