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pgn: accept tag pairs with leading whitespace (fixes #1115) #1195

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pgn: accept tag pairs with leading whitespace (fixes #1115) #1195

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1aa08dc
pgn: accept tag pairs with leading whitespace (fixes #1115)
Jun 25, 2026
b133b5f
Add PGN leading whitespace header test
gaoflow Jun 26, 2026
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5 changes: 3 additions & 2 deletions chess/pgn.py
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Original file line number Diff line number Diff line change
Expand Up @@ -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:
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18 changes: 18 additions & 0 deletions test.py
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Original file line number Diff line number Diff line change
Expand Up @@ -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)
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