diff --git a/planning_docs/GAMEPLAY.md b/planning_docs/GAMEPLAY.md
index cd721ee..954f9cb 100644
--- a/planning_docs/GAMEPLAY.md
+++ b/planning_docs/GAMEPLAY.md
@@ -77,6 +77,11 @@ Battles use a **tick-based system** rather than "turns" (which imply guaranteed
 
 **Battle result grading**: Derived from enemy sunk ratios and damage delivered/received. Better battle result yields better loot quality/choice.
 - **[TODO: ELABORATE VICTORY GRADE FUNCTION]** - Current thinking is too KanColle, will work as stub for now. S/A/B/C/D ranks based on performance.
+- **Short circuit conditions** ()
+  - S: All enemies sunk
+  - A: over half enemies sunk (2/3, 1/2) or enemy flagship sunk
+  - B: enemy damage percentage (hp_lost / hp_sum_at_battle_start) greater than player damage percentage
+  - C: Something else
 - **Known vulnerability**: Losing spiral - weak fleet → bad results → bad loot → weaker fleet. May need catch-up mechanics (dockyards buff weak fleets, events offer risky power spikes).
 
 #### Elite Combat Node