diff --git a/klient/client.py b/klient/client.py
index 3a1ed40..65bbba2 100644
--- a/klient/client.py
+++ b/klient/client.py
@@ -13,13 +13,14 @@ from typing import List, Optional, Tuple
 
 parser = argparse.ArgumentParser()
 parser.add_argument("--token", type=str, required=True, help="API token.")
-parser.add_argument("--program", type=str, required=True, help="Program to run.")
 parser.add_argument("--server", type=str, default="http://localhost:5000", help="Server address.")
 parser.add_argument("--game", type=str, default="main", help="'main' or 'test_#'.")
-parser.add_argument("--copy", default=False, action="store_true", help="Save a copy of the program to ensure the same code is used all the time.")
-parser.add_argument("--log-level", type=str, default="warning", choices=["error", "warning", "info"])
+parser.add_argument("--command", type=str, nargs="+", default=["python3", "%"], help="Command to execute as strategy code. Use '%' for program.")
+parser.add_argument("--program", type=str, default=None, help="Program to substitute to command.")
+parser.add_argument("--copy", default=False, action="store_true",
+                    help="Save a copy of the program to ensure the same code is used all the time.")
+parser.add_argument("--log-level", type=str, default="info", choices=["error", "warning", "info"])
 parser.add_argument("--save-state", type=str, default=None, help="Save state to this file.")
-# parser.add_argument("program", nargs=argparse.REMAINDER, help="Program to run.")
 
 
 TIME_BEFORE_RETRY = 2.0
@@ -29,12 +30,10 @@ logger = logging.getLogger("client")
 
 def main(args: argparse.Namespace) -> None:
     logger.setLevel(args.log_level.upper())
-    program = args.program
-    if args.copy:
-        program = tempfile.mktemp()
-        shutil.copyfile(args.program, program)
-    program = "./" + program
     min_round = 0
+    program = None
+    if args.save_state is None:
+        program = get_command(args)
 
     while True:
         state = get_state(min_round, args)
@@ -60,12 +59,28 @@ def main(args: argparse.Namespace) -> None:
         send_turn(turn, round, args)
 
 
+def get_command(args) -> List[str]:
+    if args.program is None:
+        logger.error("Program not specified.")
+        sys.exit(1)
+
+    program = args.program
+    if args.copy:
+        program = tempfile.mktemp()
+        shutil.copyfile(args.program, program)
+
+    command: List[str] = []
+    for arg in args.command:
+        command.append(arg.replace("%", program))
+    return command
+
+
 def run_subprocess(
-    program: str, state_json: str, timeout: Optional[float]
+    command: List[str], state_json: str, timeout: Optional[float]
 ) -> Optional[str]:
     """Run user program and return its output."""
 
-    proc = Popen([program], encoding="utf-8",
+    proc = Popen(command, encoding="utf-8",
                  stdin=PIPE, stdout=PIPE, stderr=PIPE)
     try:
         stdout, stderr = proc.communicate(input=state_json, timeout=timeout)