head hunt only when my snake is bigger and into dual mode

snakes/BestBattleSnake.py

@@ -348,6 +348,7 @@ class BestBattleSnake(TemplateSnake):
     enemy_head = (enemy["head"]["x"], enemy["head"]["y"])
     enemy_len = enemy.get("length", len(enemy["body"]))
     encase_target_space = max(8, enemy_len * 2)
+    can_head_hunt = my_len > enemy_len and my_len >= 8
 
     scores:dict[str, float] = {}
     move_safety:dict[str, dict[str, Any]] = {}
@@ -421,10 +422,10 @@ class BestBattleSnake(TemplateSnake):
         score += max(0, 3 - enemy_options) * 95.0
         if reachable_space > enemy_space:
           score += 120.0
-        if direct_head_distance <= 2:
+        if direct_head_distance <= 2 and can_head_hunt:
           score += 40.0
 
-      if my_len > enemy_len:
+      if can_head_hunt:
         if direct_head_distance == 1:
           score += 220.0 * duel_weights["head_pressure"]
         elif direct_head_distance == 2:
@@ -432,6 +433,8 @@ class BestBattleSnake(TemplateSnake):
       else:
         if direct_head_distance <= 2:
           score -= 120.0 * duel_weights["distance_safety"]
+        if direct_head_distance == 1:
+          score -= 180.0 * duel_weights["distance_safety"]
 
       hunger_urgency = max(0.0, (65.0 - my_health) / 65.0)
       if nearest_food_dist is not None:
@@ -918,7 +921,7 @@ class BestBattleSnake(TemplateSnake):
   def _distance_map(self, start:Point, blocked:set[Point], width:int, height:int) -> dict[Point, int]:
     """Build a BFS distance map from the given start cell."""
     queue = deque([(start, 0)])
-    distances = {start:0}
+    distances = {start: 0}
 
     while queue:
       point, distance = queue.popleft()