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The dataset generation failed
Error code: DatasetGenerationError
Exception: CastError
Message: Couldn't cast
clocks: list<item: int64>
child 0, item: int64
fen: string
id: string
legal: list<item: string>
child 0, item: string
mover_rating: int64
moves: list<item: string>
child 0, item: string
opponent_rating: int64
time_control: string
move: string
to
{'id': Value('string'), 'move': Value('string')}
because column names don't match
Traceback: Traceback (most recent call last):
File "/usr/local/lib/python3.14/site-packages/datasets/builder.py", line 1827, in _prepare_split_single
for key, table in generator:
^^^^^^^^^
File "/src/services/worker/src/worker/job_runners/config/parquet_and_info.py", line 613, in wrapped
for item in generator(*args, **kwargs):
~~~~~~~~~^^^^^^^^^^^^^^^^^
File "/usr/local/lib/python3.14/site-packages/datasets/packaged_modules/json/json.py", line 343, in _generate_tables
self._cast_table(pa_table, json_field_paths=json_field_paths),
~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/local/lib/python3.14/site-packages/datasets/packaged_modules/json/json.py", line 132, in _cast_table
pa_table = table_cast(pa_table, self.info.features.arrow_schema)
File "/usr/local/lib/python3.14/site-packages/datasets/table.py", line 2378, in table_cast
return cast_table_to_schema(table, schema)
File "/usr/local/lib/python3.14/site-packages/datasets/table.py", line 2306, in cast_table_to_schema
raise CastError(
...<3 lines>...
)
datasets.table.CastError: Couldn't cast
clocks: list<item: int64>
child 0, item: int64
fen: string
id: string
legal: list<item: string>
child 0, item: string
mover_rating: int64
moves: list<item: string>
child 0, item: string
opponent_rating: int64
time_control: string
move: string
to
{'id': Value('string'), 'move': Value('string')}
because column names don't match
The above exception was the direct cause of the following exception:
Traceback (most recent call last):
File "/src/services/worker/src/worker/job_runners/config/parquet_and_info.py", line 1369, in compute_config_parquet_and_info_response
parquet_operations, partial, estimated_dataset_info = stream_convert_to_parquet(
~~~~~~~~~~~~~~~~~~~~~~~~~^
builder, max_dataset_size_bytes=max_dataset_size_bytes
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
)
^
File "/src/services/worker/src/worker/job_runners/config/parquet_and_info.py", line 948, in stream_convert_to_parquet
builder._prepare_split(split_generator=splits_generators[split], file_format="parquet")
~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/local/lib/python3.14/site-packages/datasets/builder.py", line 1694, in _prepare_split
for job_id, done, content in self._prepare_split_single(
~~~~~~~~~~~~~~~~~~~~~~~~~~^
gen_kwargs=gen_kwargs, job_id=job_id, **_prepare_split_args
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
):
^
File "/usr/local/lib/python3.14/site-packages/datasets/builder.py", line 1880, in _prepare_split_single
raise DatasetGenerationError("An error occurred while generating the dataset") from e
datasets.exceptions.DatasetGenerationError: An error occurred while generating the datasetNeed help to make the dataset viewer work? Make sure to review how to configure the dataset viewer, and open a discussion for direct support.
id string | move string |
|---|---|
v000000 | f2e2 |
v000001 | g6g7 |
v000002 | g2g3 |
v000003 | a8b8 |
v000004 | c8b6 |
v000005 | d7c6 |
v000006 | a7a5 |
v000007 | c5a4 |
v000008 | f2f1q |
v000009 | e7e6 |
v000010 | e6g7 |
v000011 | b5a5 |
v000012 | e3f4 |
v000013 | e7d8 |
v000014 | h6g5 |
v000015 | h8g8 |
v000016 | h8c8 |
v000017 | a7d4 |
v000018 | d3c5 |
v000019 | e8f8 |
v000020 | a5b4 |
v000021 | e2f1 |
v000022 | a2a4 |
v000023 | d7g7 |
v000024 | b7e7 |
v000025 | d5d4 |
v000026 | b7c7 |
v000027 | a3b4 |
v000028 | c5c4 |
v000029 | d5c6 |
v000030 | f5e7 |
v000031 | g6g8 |
v000032 | f7f6 |
v000033 | d7c7 |
v000034 | f4e5 |
v000035 | c4c1 |
v000036 | b3b4 |
v000037 | d3c4 |
v000038 | c6c8 |
v000039 | d3e5 |
v000040 | c5b5 |
v000041 | c1e1 |
v000042 | h3f3 |
v000043 | h2h1q |
v000044 | g5h4 |
v000045 | h8g7 |
v000046 | d6f5 |
v000047 | d2c1 |
v000048 | c5b4 |
v000049 | c4c5 |
v000050 | h5h6 |
v000051 | e6c8 |
v000052 | d4e3 |
v000053 | c8b8 |
v000054 | b3b2 |
v000055 | d8d7 |
v000056 | f6e5 |
v000057 | c7a8 |
v000058 | c4e6 |
v000059 | e2d4 |
v000060 | f3d1 |
v000061 | a4a5 |
v000062 | e6e5 |
v000063 | f4e3 |
v000064 | g6f5 |
v000065 | h6h5 |
v000066 | g8f8 |
v000067 | b7b6 |
v000068 | d4e6 |
v000069 | f4e4 |
v000070 | c2c1 |
v000071 | g5g4 |
v000072 | e7a3 |
v000073 | c7b7 |
v000074 | d4d3 |
v000075 | c5d6 |
v000076 | a6a5 |
v000077 | h4h5 |
v000078 | g3f3 |
v000079 | d4e4 |
v000080 | f2d1 |
v000081 | b8b7 |
v000082 | c4c3 |
v000083 | c4a3 |
v000084 | c3a5 |
v000085 | d3h3 |
v000086 | c3d5 |
v000087 | h6g6 |
v000088 | d3d4 |
v000089 | f6h5 |
v000090 | h6h5 |
v000091 | e4e3 |
v000092 | a4a2 |
v000093 | g2f1 |
v000094 | d2c2 |
v000095 | f3d5 |
v000096 | d4g4 |
v000097 | f7e7 |
v000098 | f4f1 |
v000099 | f6g5 |
End of preview.
Lichess blitz samples
Filtered, anonymised rated blitz games from the Lichess open database (CC0).
| Folder | Source |
|---|---|
blitz-2026-06/ |
rated blitz games from the start of the June 2026 export |
blitz-2026-06-1300-1499/ |
rated 3+0 and 5+0 blitz games from June 2026, both players rated 1300-1499 |
blitz-2026-07-1300-1499-positions/ |
single positions sampled from July 2026 games of the same pool, with the move played |
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