diff --git a/formatted_with_black.server.py b/formatted_with_black.server.py
new file mode 100755
index 0000000..56f4d2f
--- /dev/null
+++ b/formatted_with_black.server.py
@@ -0,0 +1,89 @@
+#!/usr/bin/python3
+
+import socket
+import threading
+
+HOST = "0.0.0.0"
+PORT = 12345
+
+server = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
+server.bind((HOST, PORT))
+clients = []
+lock = threading.Lock()
+
+
+def send_to_all(conn, msg):
+    with lock:
+        for client, _ in clients:
+            if client != conn:
+                try:
+                    client.sendall(msg.encode("utf-8"))
+                except BrokenPipeError:
+                    print("Verbindung verloren.")
+                    with lock:
+                        clients.remove((conn, nick))
+                    conn.close()
+                    break
+
+
+def handle_client(conn, addr):
+    nick = conn.recv(1024).decode("utf-8")
+    print(f"Neuer Client verbunden: {addr} ({nick})")
+    send_to_all(conn, f"{nick} hat den Chat betreten.")
+
+    with lock:
+        clients.append((conn, nick))
+
+    while True:
+        try:
+            msg = conn.recv(1024).decode("utf-8")
+
+            if not msg:
+                break
+
+            elif msg == "exit":
+                print("Client getrennt:", addr)
+                send_to_all(conn, f"{nick} hat den Chat verlassen")
+                with lock:
+                    clients.remove((conn, nick))
+                conn.close()
+                break
+
+            print(clients)
+            print(f"Nachricht von {addr} ({nick}): {msg}")
+
+            if conn.fileno() != -1:
+                send_to_all(conn, f"<{nick}>:{msg}")
+
+        except ConnectionResetError:
+            print("Client getrennt (Verbindungsreset):", addr)
+            send_to_all(conn, f"{nick} hat den Chat verlassen.")
+
+            with lock:
+                clients.remove((conn, nick))
+            conn.close()
+
+            break
+
+
+def start_server():
+    server.listen()
+    print(f"Server läuft auf {HOST}:{PORT}")
+
+    while True:
+        conn, addr = server.accept()
+        threading.Thread(target=handle_client, args=(conn, addr)).start()
+
+
+if __name__ == "__main__":
+    try:
+        start_server()
+    except KeyboardInterrupt:
+        print("Server wird heruntergefahren.")
+
+        with lock:
+            for client, nick in clients:
+                send_to_all(client, f"{nick} hat den Chat verlassen.")
+                client.close()
+
+        server.close()