diff --git a/server/bin/control_game b/server/bin/control_game
new file mode 100755
index 0000000..5466d4d
--- /dev/null
+++ b/server/bin/control_game
@@ -0,0 +1,22 @@
+#!/usr/bin/env python3
+import hra.db as db
+import hra.lib as lib
+from hra.util import hash_passwd
+
+import argparse
+from sqlalchemy import exc, update
+import sys
+
+g = db.Game(game_mode="", configuration={}, teams_count=1)
+
+parser = argparse.ArgumentParser()
+parser.add_argument("game_id")
+parser.add_argument("--step", action="store_true")
+parser.add_argument("--restore", action="store_true")
+
+args = parser.parse_args()
+
+if args.restore:
+	lib.game_restore_broken(args.game_id)
+if args.step:
+	lib.game_step(args.game_id)
diff --git a/server/bin/create_game b/server/bin/create_game
new file mode 100755
index 0000000..9e75e1d
--- /dev/null
+++ b/server/bin/create_game
@@ -0,0 +1,25 @@
+#!/usr/bin/env python3
+from hra.game import logic_by_mode
+import hra.db as db
+import hra.lib as lib
+
+import sys
+from sqlalchemy import exc, update
+
+
+mode = "occupy"
+teams_count = 6
+configuration = {}
+g = db.Game(game_mode=mode, configuration=configuration, teams_count=teams_count)
+
+db.get_session().add(g)
+db.get_session().commit()
+
+s = db.State(game_id=g.game_id, round=0, state=g.get_logic().zero_state())
+
+db.get_session().add(s)
+g.current_round = 0
+g.working_on_next_state = False
+db.get_session().commit()
+
+print(f"Přidána hra {g.game_id}. ")
diff --git a/server/hra/db.py b/server/hra/db.py
index b782830..1e28fac 100644
--- a/server/hra/db.py
+++ b/server/hra/db.py
@@ -16,6 +16,7 @@ import secrets
 import string
 
 import hra.config as config
+import hra.game
 
 Base = declarative_base()
 metadata = Base.metadata
@@ -65,17 +66,26 @@ class Game(Base):
     configuration = Column(JSONB, nullable=False)
     game_mode = Column(String(80), nullable=False)
     teams_count = Column(Integer, nullable=False)
+    working_on_next_state = Column(Boolean, nullable=False, default=True)
+    current_round = Column(Integer, default=-1)
 
+    def current_state(self) -> Optional['State']:
+        if self.working_on_next_state is True:
+            return None
+        return get_session().query(State).filter_by(game_id=self.game_id, round=self.current_round).order_by(State.round.desc()).first()
 
-    def current_state(self) -> 'State':
-        return get_session().query(State).filter_by(game_id=self.game_id).order_by(State.round.desc()).first()
+    def get_logic(self) -> 'hra.game.Logic':
+        return hra.game.logic_by_mode[self.game_mode](self.teams_count, self.configuration)
+
+    def lock(self) -> 'Game':
+        return get_session().query(Game).filter_by(game_id=self.game_id).with_for_update().first()
 
 
 class State(Base):
     __tablename__ = 'states'
 
     game_id = Column(Integer, ForeignKey('games.game_id'), primary_key=True, nullable=False)
-    round = Column(Integer)
+    round = Column(Integer, primary_key=True)
     state = Column(JSONB)
 
     game = relationship('Game', primaryjoin='State.game_id == Game.game_id')
@@ -84,8 +94,8 @@ class Move(Base):
     __tablename__ = 'moves'
 
     game_id = Column(Integer, ForeignKey('games.game_id'), primary_key=True, nullable=False)
-    round = Column(Integer)
-    team_id = Column(Integer)
+    round = Column(Integer, primary_key=True)
+    team_id = Column(Integer, primary_key=True)
     move = Column(JSONB)
 
     game = relationship('Game', primaryjoin='Move.game_id == Game.game_id')
diff --git a/server/hra/game.py b/server/hra/game.py
index ea1db6e..aa9c26e 100644
--- a/server/hra/game.py
+++ b/server/hra/game.py
@@ -12,15 +12,18 @@ class Logic:
     def zero_state(self) -> Any:
         return {}
 
-    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 step(self, state: Any, moves: List[Optional[Any]], round_id: int) -> Tuple[Any, List[int]]:
+        return {}, [0] * self.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]:
+    def validate_move(self, state: Any, team_id: int, move: 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
+        # throw Exception("Chybí povinná ...") # Zásadní chyba, tah neuznán 
                 # Když používají našeho klienta, tak by se toto nemělo stát
 
+    def personalize_state(self, state: Any, team_id: int, round_id: int) -> Any:
+        return state
+
 @add_logic
 class Occupy(Logic):
     pass
diff --git a/server/hra/lib.py b/server/hra/lib.py
new file mode 100644
index 0000000..ae402aa
--- /dev/null
+++ b/server/hra/lib.py
@@ -0,0 +1,50 @@
+import json
+import hra.config as config
+import hra.db as db
+
+class DuplicitMakeStep(Exception):
+    pass
+
+def game_step(game_id: int):
+    ses = db.get_session()
+
+    ses.expire_all()
+    game = ses.query(db.Game).filter_by(game_id=game_id).with_for_update().one_or_none()
+    assert game is not None
+    if game.working_on_next_state:
+        ses.commit()
+        raise DuplicitMakeStep()
+    game.working_on_next_state = True
+    ses.commit()
+
+    old_round_id = game.current_round
+    new_round_id = old_round_id + 1
+    old_state = ses.query(db.State).filter_by(game_id=game.game_id, round=old_round_id).one_or_none()
+
+    moves = [None for _ in range(game.teams_count)]
+    for i in ses.query(db.Move).filter_by(game_id=game.game_id, round=old_round_id).all():
+        moves[i.team_id] = i.move
+
+    ses.commit()
+
+    x, points = game.get_logic().step(old_state.state, moves, old_round_id)
+
+    new_state = db.State(game_id=game.game_id, round=new_round_id, state=x)
+    ses.add(new_state)
+
+    ses.expire_all()
+    game = ses.query(db.Game).filter_by(game_id=game_id).with_for_update().one_or_none()
+    assert game is not None
+    assert game.working_on_next_state
+    game.current_round = new_round_id
+    game.working_on_next_state = False
+    ses.commit()
+
+def game_restore_broken(game_id: int) -> None:
+    ses = db.get_session()
+    ses.expire_all()
+    game = ses.query(db.Game).filter_by(game_id=game_id).with_for_update().one_or_none()
+    game.working_on_next_state = False
+    ses.commit()
+
+
diff --git a/server/hra/web/api.py b/server/hra/web/api.py
index 0a79a5d..d994d7a 100644
--- a/server/hra/web/api.py
+++ b/server/hra/web/api.py
@@ -1,32 +1,94 @@
 from flask import Flask, redirect, flash, render_template, session, g, request, get_flashed_messages
 import werkzeug.exceptions
-import time
-from datetime import datetime
 import json
 
 import hra.config as config
-import hra.web.html as html
 import hra.db as db
 from hra.web import app, NeedLoginError
 import hra.web.jinja_mac as jinja_mac
 
+def args_get(name, type, optional=False, default=None):
+    v = request.args.get(name)
+    if v is None:
+        if optional:
+            return default
+        else:
+            raise werkzeug.exceptions.BadRequest(f"Missing mandatory option {name}.")
+    try:
+        return type(v)
+    except ValueError:
+        raise werkzeug.exceptions.BadRequest(f"Option {name} have wrong type.")
+
 
 def get_context():
     if g.user is None:
         raise NeedLoginError
-    game_id = request.args.get('game') or 1
-    team_id = request.args.get('team') or 0
+    game_id = args_get("game", int, True, 1)
+    team_id = args_get('team', int, True, 0)
     game = db.get_session().query(db.Game).filter_by(game_id=game_id).first()
-    print(game_id, game, team_id)
     if game is None:
         raise werkzeug.exceptions.NotFound("No such game")
     return game, team_id
 
+
 @app.route("/api/state", methods=['GET'])
 def api_state():
-    game, team_id =  get_context()
+    game, team_id = get_context()
     state = game.current_state()
+    if state is None:
+        return json.dumps({
+            "status": "working",
+            "wait": 1.0,
+        })
     return json.dumps({
+        "status": "ok",
         "round": state.round,
-        "state": state.state,
+        "team_id": team_id,
+        "state": game.get_logic().personalize_state(state.state, team_id, state.round),
+    })
+
+@app.route("/api/action", methods=['POST'])
+def api_action():
+    def to_late():
+        return json.dumps({
+            "status": "too-late",
+        })
+
+    game, team_id = get_context()
+    j = request.get_json()
+    state = game.current_state()
+    round_id = args_get('round', int)
+    if round_id < 0 or round_id > game.current_round:
+        raise werkzeug.exceptions.BadRequest("Wrong round.")
+    if game.working_on_next_state or round_id < game.current_round:
+        return to_late()
+
+    try:
+        warnings = game.get_logic().validate_move(state.state, team_id, j, round_id)
+    except Exception as e:
+        return json.dumps({
+            "error": "error",
+            "description": str(e)
         })
+
+    db.get_session().expire_all()
+    game = game.lock()
+
+    if game.working_on_next_state or round_id < game.current_round:
+        db.get_session().commit()
+        return to_late()
+
+    move = db.get_session().query(db.Move).filter_by(game_id=game.game_id, team_id=team_id, round=round_id).one_or_none()
+    if move is None:
+        move = db.Move(game_id=game.game_id, team_id=team_id, round=round_id)
+        db.get_session().add(move)
+
+    move.move = j
+
+    db.get_session().commit()
+
+    if warnings is not None:
+        return json.dumps(warnings)
+    return json.dumps({
+        "status": "ok",
+    })
diff --git a/server/hra/web/pages.py b/server/hra/web/pages.py
index 37c8f6b..d3faac2 100644
--- a/server/hra/web/pages.py
+++ b/server/hra/web/pages.py
@@ -248,5 +248,3 @@ def web_su():
         return redirect('/')
 
     return render_template("org_su.html", f=f)
-
-
diff --git a/server/setup.py b/server/setup.py
index e560876..08793d9 100644
--- a/server/setup.py
+++ b/server/setup.py
@@ -10,6 +10,8 @@ setuptools.setup(
     scripts=[
         "bin/db_init",
         "bin/create_root",
+        "bin/create_game",
+        "bin/control_game",
     ],
     include_package_data=True,
     zip_safe=False,