diff --git a/chess/pgn.py b/chess/pgn.py
index 5ae5b43b..3d4d7e5f 100644
--- a/chess/pgn.py
+++ b/chess/pgn.py
@@ -1636,13 +1636,14 @@ def read_game(handle: TextIO, *, Visitor: Any = GameBuilder) -> Any:
                 if not isinstance(managed_headers, Headers):
                     unmanaged_headers = Headers({})
 
-        if not line.startswith("["):
+        stripped = line.lstrip()
+        if not stripped.startswith("["):
             break
 
         consecutive_empty_lines = 0
 
         if not skipping_game:
-            tag_match = TAG_REGEX.match(line)
+            tag_match = TAG_REGEX.match(stripped)
             if tag_match:
                 visitor.visit_header(tag_match.group(1), tag_match.group(2))
                 if unmanaged_headers is not None:
diff --git a/test.py b/test.py
index cc8a95b7..ac906638 100755
--- a/test.py
+++ b/test.py
@@ -2233,6 +2233,24 @@ def test_read_game(self):
         self.assertEqual(sixth_game.headers["White"], "Deep Blue (Computer)")
         self.assertEqual(sixth_game.headers["Result"], "1-0")
 
+    def test_read_game_with_leading_whitespace_before_header(self):
+        pgn = io.StringIO(
+            ' [Event "TCEC Season 27 - Entrance League"]\n'
+            '[Site "https://tcec-chess.com"]\n'
+            '[White "Patricia 3.1_dev_ca7ef0a3"]\n'
+            '[Black "Weiss 2.1-dev11"]\n'
+            '[Result "*"]\n'
+            "\n"
+            "1. d4 *"
+        )
+
+        game = chess.pgn.read_game(pgn)
+
+        self.assertEqual(game.headers["Event"], "TCEC Season 27 - Entrance League")
+        self.assertEqual(game.headers["White"], "Patricia 3.1_dev_ca7ef0a3")
+        self.assertEqual(game.next().move, chess.Move.from_uci("d2d4"))
+        self.assertEqual(game.errors, [])
+
     def test_read_game_with_multicomment_move(self):
         pgn = io.StringIO("1. e4 {A common opening} 1... e5 {A common response} {An uncommon comment}")
         game = chess.pgn.read_game(pgn)