added main, should work

piskvorky.py

@@ -1,17 +1,20 @@
 board = [[" ", " ", " "], [" ", " ", " "], [" ", " ", " "]]
 player_marks = ["x", "y"]
 
-def print_board(board):
+
+def print_board():
     print(f"""   1 2 3 
 1 |{board[0][0]}|{board[0][1]}|{board[0][2]}|
 2 |{board[1][0]}|{board[1][1]}|{board[1][2]}|
 3 |{board[2][0]}|{board[2][1]}|{board[2][2]}|
 """)
 
+
 def player(x_or_y):
     player_move = input("Zvol si radu a sloupec ")
-	while length(player_move) != 3:
+    while 3 != len(player_move):
         print("spatny pocet znaku")
+        player_move = input("Zvol si radu a sloupec ")
     else:
         try:
             if board[int(player_move[0]) - 1][int(player_move[2]) - 1] == " ":
@@ -23,6 +26,7 @@ def player(x_or_y):
             print("Moznost nelze vybrat")
             player_move = input("Zvol si radu a sloupec ")
 
+
 def check_win():
     for i in range(3):  # Kontrola sloupcu
         if board[i][0] in player_marks and board[i][1] in player_marks and board[i][2] in player_marks:
@@ -32,10 +36,31 @@ def check_win():
         if board[0][i] in player_marks and board[1][i] in player_marks and board[2][i] in player_marks:
             print(f"Vyhral hrac {board[0][i]}")
             return False
-	if 
+    if board[0][0] in player_marks and board[1][1] in player_marks and board[2][
+        2] in player_marks:  # Kontrola diagonaly
+        print(f"Vyhral hrac {board[0][i]}")  # z prava do leva
+        return False
+    elif board[0][2] in player_marks and board[1][1] in player_marks and board[2][
+        0] in player_marks:  # Kontrola diagonaly
+        print(f"Vyhral hrac {board[0][i]}")  # z leva do prava
+        return False
+    return True
 
 
 x_or_y = "x"
+
+rounds = 0
+
+
+def main(rounds):
+    while rounds < 9:
+        if rounds % 2 == 0:
+            x_or_y = "x"
+        else:
+            x_or_y = "o"
+        print_board()
         player(x_or_y)
-print_board(board)
-check_win()
+        rounds += 1
+        if not check_win():
+            break
+main(rounds)