diff --git a/leetcode/stacks/20_valid_parentheses.py b/leetcode/stacks/0020_valid_parentheses.py
similarity index 100%
rename from leetcode/stacks/20_valid_parentheses.py
rename to leetcode/stacks/0020_valid_parentheses.py
diff --git a/leetcode/stacks/0682_baseball_game.py b/leetcode/stacks/0682_baseball_game.py
new file mode 100644
index 0000000..af4e336
--- /dev/null
+++ b/leetcode/stacks/0682_baseball_game.py
@@ -0,0 +1,45 @@
+from typing import List
+import pytest
+
+
+class Solution:
+    def calPoints(self, operations: List[str]) -> int:
+        r: List[int] = []  # result
+        r_l: int = 0
+        for o_i in range(0, len(operations)):
+            try:
+                i = int(operations[o_i])
+                r.append(i)
+                r_l += 1
+                continue
+            except ValueError:
+                pass
+            if operations[o_i] == "+":
+                r.append(r[r_l - 1] + r[r_l - 2])
+                r_l += 1
+                continue
+            elif operations[o_i] == "D":
+                r.append(r[r_l - 1] * 2)
+                r_l += 1
+                continue
+            elif operations[o_i] == "C":
+                r.pop()
+                r_l -= 1
+                continue
+            else:
+                pass
+        return sum(r)
+
+
+@pytest.mark.parametrize(
+    "input, exp_output",
+    [
+        (["5", "2", "C", "D", "+"], 30),
+        (["5", "-2", "4", "C", "D", "9", "+", "+"], 27),
+        (["1", "C"], 0),
+        ([], 0),
+    ],
+)
+def test_solution(input, exp_output):
+    sol = Solution()
+    assert sol.calPoints(input) == exp_output
diff --git a/leetcode/stacks/__pycache__/0682_baseball_game.cpython-310-pytest-8.3.4.pyc b/leetcode/stacks/__pycache__/0682_baseball_game.cpython-310-pytest-8.3.4.pyc
new file mode 100644
index 0000000..ef1ecc4
Binary files /dev/null and b/leetcode/stacks/__pycache__/0682_baseball_game.cpython-310-pytest-8.3.4.pyc differ