diff --git a/KeyDoorShuffle.py b/KeyDoorShuffle.py
index a903f8ab..becf6bf8 100644
--- a/KeyDoorShuffle.py
+++ b/KeyDoorShuffle.py
@@ -374,15 +374,16 @@ def refine_placement_rules(key_layout, max_ctr):
                     rule.needed_keys_w_bk -= len(key_onlys)
                 if rule.needed_keys_w_bk == 0:
                     rules_to_remove.append(rule)
-                if rule.bk_relevant and len(rule.check_locations_w_bk) == rule.needed_keys_w_bk + 1:
-                    new_restricted = set(max_ctr.free_locations) - rule.check_locations_w_bk
-                    if len(new_restricted | key_logic.bk_restricted) < len(key_layout.all_chest_locations):
-                        if len(new_restricted - key_logic.bk_restricted) > 0:
-                            key_logic.bk_restricted.update(new_restricted)  # bk must be in one of the check_locations
-                            changed = True
-                    else:
-                        rules_to_remove.append(rule)
-                        changed = True
+                # todo: evaluate this usage
+                # if rule.bk_relevant and len(rule.check_locations_w_bk) == rule.needed_keys_w_bk + 1:
+                #     new_restricted = set(max_ctr.free_locations) - rule.check_locations_w_bk
+                #     if len(new_restricted | key_logic.bk_restricted) < len(key_layout.all_chest_locations):
+                #         if len(new_restricted - key_logic.bk_restricted) > 0:
+                #             key_logic.bk_restricted.update(new_restricted)  # bk must be in one of the check_locations
+                #             changed = True
+                #     else:
+                #         rules_to_remove.append(rule)
+                #         changed = True
                 if rule.needed_keys_w_bk > key_layout.max_chests or len(rule.check_locations_w_bk) < rule.needed_keys_w_bk:
                     logging.getLogger('').warning('Invalid rule - what went wrong here??')
                     rules_to_remove.append(rule)