diff --git a/server/hra/game.py b/server/hra/game.py
index f32916b..ea1db6e 100644
--- a/server/hra/game.py
+++ b/server/hra/game.py
@@ -1,13 +1,28 @@
+from typing import Any, List, Tuple, Union, Optional
 
-class Logic():
-    def __init__(self, teams_count, configuration):
-        pass
+logic_by_mode = {}
+def add_logic(cls):
+    logic_by_mode[cls.__name__.lower()] = cls
 
-    def zero_state(self):
+class Logic:
+    def __init__(self, teams_count: int, configuration: Any):
+        self.teams_count = teams_count
+        self.configuration = configuration
+
+    def zero_state(self) -> Any:
         return {}
 
-    def step(self, actions):
-        pass
+    def step(self, state: Any, actions: List[Optional[Any]], round_id: int) -> Tuple[Any, List[int]]:
+        return {}, [0] * teams_count # new_state, add_points for each team
+
+    def validate_step(self, state: Any, team_id: int, action: Any, round_id: int) -> Union[None, Any]:
+        return None # Bez chyby
+        # return {"status": "warning", ... } # Drobná chyba, ale tah provedu
+        # throw Exception("Chybí povinná ...") # Zásadní chyba, tah neuznán
+                # Když používají našeho klienta, tak by se toto nemělo stát
+
+@add_logic
+class Occupy(Logic):
+    pass
 
 
-logic_by_mode = {"base": Logic}