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The dataset generation failed
Error code: DatasetGenerationError
Exception: CastError
Message: Couldn't cast
written: int64
target: int64
rate_pos_s: double
phase_counts: struct<endgame: int64, opening: int64, middlegame: int64>
child 0, endgame: int64
child 1, opening: int64
child 2, middlegame: int64
phase_fracs: struct<opening: double, middlegame: double, endgame: double>
child 0, opening: double
child 1, middlegame: double
child 2, endgame: double
depth_hist: struct<12: int64, 15: int64, 14: int64, 16: int64, 17: int64, 11: int64, 13: int64, 18: int64, 10: i (... 5 chars omitted)
child 0, 12: int64
child 1, 15: int64
child 2, 14: int64
child 3, 16: int64
child 4, 17: int64
child 5, 11: int64
child 6, 13: int64
child 7, 18: int64
child 8, 10: int64
gen_hist: struct<book_playout: int64, endgame_template: int64, hf: int64, random_walk: int64>
child 0, book_playout: int64
child 1, endgame_template: int64
child 2, hf: int64
child 3, random_walk: int64
updated_at: string
label_depth: int64
fen: string
teacher_entropy: double
hf_repo: string
source: string
best_cp: int64
ply: int64
label_mode: string
value_target: int64
soft_targets: list<item: struct<uci: string, prob: double, cp: int64, eval_type: string, rank: int64, pv: list<ite (... 12 chars omitted)
child 0, item: struct<uci: string, prob: double, cp: int64, eval_type: string, rank: int64, pv: list<item: string>>
child 0, uci: string
child 1, prob: double
child 2, cp: int64
child 3, eval_type: string
child 4, rank: int64
child 5, pv: list<item: string>
child 0, item: string
mate: int64
phase_id: int64
cp_gap_top1_top2: int64
num_legal: int64
gen_source: string
label_multipv: int64
label_tau: double
created_at: string
best_move: string
phase: string
to
{'fen': Value('string'), 'best_move': Value('string'), 'best_cp': Value('int64'), 'soft_targets': List({'uci': Value('string'), 'prob': Value('float64'), 'cp': Value('int64'), 'eval_type': Value('string'), 'rank': Value('int64'), 'pv': List(Value('string'))}), 'label_depth': Value('int64'), 'label_multipv': Value('int64'), 'label_tau': Value('float64'), 'label_mode': Value('string'), 'num_legal': Value('int64'), 'phase': Value('string'), 'phase_id': Value('int64'), 'ply': Value('int64'), 'source': Value('string'), 'created_at': Value('string'), 'value_target': Value('int64'), 'cp_gap_top1_top2': Value('int64'), 'teacher_entropy': Value('float64'), 'mate': Value('int64'), 'hf_repo': Value('string'), 'gen_source': 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 1816, 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 2369, in table_cast
return cast_table_to_schema(table, schema)
File "/usr/local/lib/python3.14/site-packages/datasets/table.py", line 2297, in cast_table_to_schema
raise CastError(
...<3 lines>...
)
datasets.table.CastError: Couldn't cast
written: int64
target: int64
rate_pos_s: double
phase_counts: struct<endgame: int64, opening: int64, middlegame: int64>
child 0, endgame: int64
child 1, opening: int64
child 2, middlegame: int64
phase_fracs: struct<opening: double, middlegame: double, endgame: double>
child 0, opening: double
child 1, middlegame: double
child 2, endgame: double
depth_hist: struct<12: int64, 15: int64, 14: int64, 16: int64, 17: int64, 11: int64, 13: int64, 18: int64, 10: i (... 5 chars omitted)
child 0, 12: int64
child 1, 15: int64
child 2, 14: int64
child 3, 16: int64
child 4, 17: int64
child 5, 11: int64
child 6, 13: int64
child 7, 18: int64
child 8, 10: int64
gen_hist: struct<book_playout: int64, endgame_template: int64, hf: int64, random_walk: int64>
child 0, book_playout: int64
child 1, endgame_template: int64
child 2, hf: int64
child 3, random_walk: int64
updated_at: string
label_depth: int64
fen: string
teacher_entropy: double
hf_repo: string
source: string
best_cp: int64
ply: int64
label_mode: string
value_target: int64
soft_targets: list<item: struct<uci: string, prob: double, cp: int64, eval_type: string, rank: int64, pv: list<ite (... 12 chars omitted)
child 0, item: struct<uci: string, prob: double, cp: int64, eval_type: string, rank: int64, pv: list<item: string>>
child 0, uci: string
child 1, prob: double
child 2, cp: int64
child 3, eval_type: string
child 4, rank: int64
child 5, pv: list<item: string>
child 0, item: string
mate: int64
phase_id: int64
cp_gap_top1_top2: int64
num_legal: int64
gen_source: string
label_multipv: int64
label_tau: double
created_at: string
best_move: string
phase: string
to
{'fen': Value('string'), 'best_move': Value('string'), 'best_cp': Value('int64'), 'soft_targets': List({'uci': Value('string'), 'prob': Value('float64'), 'cp': Value('int64'), 'eval_type': Value('string'), 'rank': Value('int64'), 'pv': List(Value('string'))}), 'label_depth': Value('int64'), 'label_multipv': Value('int64'), 'label_tau': Value('float64'), 'label_mode': Value('string'), 'num_legal': Value('int64'), 'phase': Value('string'), 'phase_id': Value('int64'), 'ply': Value('int64'), 'source': Value('string'), 'created_at': Value('string'), 'value_target': Value('int64'), 'cp_gap_top1_top2': Value('int64'), 'teacher_entropy': Value('float64'), 'mate': Value('int64'), 'hf_repo': Value('string'), 'gen_source': 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 1683, 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 1869, 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.
fen string | best_move string | best_cp int64 | soft_targets list | label_depth int64 | label_multipv int64 | label_tau float64 | label_mode string | num_legal int64 | phase string | phase_id int64 | ply int64 | source string | created_at string | value_target int64 | cp_gap_top1_top2 int64 | teacher_entropy float64 | mate int64 | hf_repo string | gen_source string |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
8/P7/8/8/3P4/5R1k/8/7K b - - 0 1 | h3h4 | -99,996 | [
{
"uci": "h3h4",
"prob": 0.5,
"cp": -99996,
"eval_type": "mate",
"rank": 1,
"pv": [
"h3h4",
"a7a8q",
"h4h5",
"a8g8",
"h5h4",
"f3f5",
"h4h3",
"f5h5"
]
},
{
"uci": "h3g4",
"prob": 0.5,
"cp": -99996,
"eval_type": "mate",
... | 16 | 2 | 120 | multipv_topk | 2 | endgame | 2 | 1 | exp190_phase_deep | 2026-07-10T17:22:10.400372+00:00 | 0 | 0 | 0.693147 | -4 | null | endgame_template |
2q2k2/6P1/8/3P4/7Q/8/8/7K b - - 0 1 | f8g7 | 0 | [
{
"uci": "f8g7",
"prob": 0.5,
"cp": 0,
"eval_type": "cp",
"rank": 1,
"pv": [
"f8g7"
]
},
{
"uci": "f8f7",
"prob": 0.5,
"cp": 0,
"eval_type": "cp",
"rank": 2,
"pv": [
"f8f7",
"h4g5",
"f7g8",
"g5h6",
"g8f7",
"h6g5"
]... | 18 | 4 | 120 | multipv_topk | 4 | endgame | 2 | 1 | exp190_phase_deep | 2026-07-10T17:22:10.597804+00:00 | 1 | 0 | 0.693147 | -3 | null | endgame_template |
8/2K5/8/8/8/3R4/1kR5/8 b - - 0 1 | b2c2 | -20,000 | [
{
"uci": "b2c2",
"prob": 1,
"cp": -20000,
"eval_type": "cp",
"rank": 1,
"pv": [
"b2c2",
"d3e3",
"c2d2",
"e3e6",
"d2c3",
"c7c6",
"c3c4",
"c6d6"
]
},
{
"uci": "b2b1",
"prob": 0,
"cp": -99997,
"eval_type": "mate",
"rank... | 17 | 3 | 120 | multipv_topk | 3 | endgame | 2 | 1 | exp190_phase_deep | 2026-07-10T17:22:11.001987+00:00 | 0 | 79,997 | -0 | -1 | null | endgame_template |
8/8/8/8/3Q4/8/8/k6K b - - 0 1 | a1b1 | -99,989 | [
{
"uci": "a1b1",
"prob": 0.5020904541015625,
"cp": -99989,
"eval_type": "mate",
"rank": 1,
"pv": [
"a1b1",
"d4c3",
"b1a2",
"h1h2",
"a2b1",
"h2g3",
"b1a2",
"g3g2"
]
},
{
"uci": "a1a2",
"prob": 0.4979095757007599,
"cp": -99990... | 17 | 2 | 120 | multipv_topk | 2 | endgame | 2 | 1 | exp190_phase_deep | 2026-07-10T17:22:11.105548+00:00 | 0 | 1 | 0.693138 | -10 | null | endgame_template |
rn2kb1r/pp1bpppp/8/8/8/2p3K1/PP1B2PP/RN1Q3R w kq - 0 10 | b1c3 | 471 | [
{
"uci": "b1c3",
"prob": 0.35762229561805725,
"cp": 471,
"eval_type": "cp",
"rank": 1,
"pv": [
"b1c3",
"b8c6",
"a1c1",
"e8c8",
"h2h4",
"e7e5",
"c3b5",
"f8c5"
]
},
{
"uci": "d1b3",
"prob": 0.15803410112857819,
"cp": 373,
... | 10 | 8 | 120 | multipv_topk | 34 | opening | 0 | 20 | exp190_phase_deep | 2026-07-10T17:22:11.200299+00:00 | 2 | 98 | 1.811408 | 0 | null | book_playout |
8/2P2Q2/4q3/8/4P3/K5k1/8/8 w - - 0 1 | f7e6 | 99,994 | [
{
"uci": "f7e6",
"prob": 1,
"cp": 99994,
"eval_type": "mate",
"rank": 1,
"pv": [
"f7e6",
"g3h2",
"c7c8q",
"h2g2",
"e6h3",
"g2f2",
"c8f5",
"f2e1"
]
},
{
"uci": "f7g7",
"prob": 0,
"cp": 19985,
"eval_type": "cp",
"rank"... | 16 | 8 | 120 | multipv_topk | 24 | endgame | 2 | 2 | exp190_phase_deep | 2026-07-10T17:22:11.299977+00:00 | 2 | 80,009 | -0 | 6 | null | endgame_template |
8/8/8/8/8/kR1K2R1/8/8 b - - 0 1 | a3b3 | -99,991 | [
{
"uci": "a3b3",
"prob": 0.3454686403274536,
"cp": -99991,
"eval_type": "mate",
"rank": 1,
"pv": [
"a3b3",
"g3g5",
"b3b4",
"g5e5",
"b4b3",
"e5b5",
"b3a3",
"d3c3"
]
},
{
"uci": "a3a4",
"prob": 0.3286239504814148,
"cp": -99997... | 17 | 3 | 120 | multipv_topk | 3 | endgame | 2 | 1 | exp190_phase_deep | 2026-07-10T17:22:11.506662+00:00 | 0 | 6 | 1.098277 | -2 | null | endgame_template |
1rbq1bnr/pp2k1pp/3p4/2p3B1/2P1P3/3P4/PP3PPP/RN3K1R b - - 2 12 | g8f6 | 720 | [
{
"uci": "g8f6",
"prob": 0.594354510307312,
"cp": 720,
"eval_type": "cp",
"rank": 1,
"pv": [
"g8f6",
"b1c3",
"c8e6",
"c3d5",
"e6d5",
"c4d5",
"e7d7",
"g5f6"
]
},
{
"uci": "e7d7",
"prob": 0.1702854186296463,
"cp": 570,
"ev... | 11 | 5 | 120 | multipv_topk | 5 | opening | 0 | 23 | exp190_phase_deep | 2026-07-10T17:22:11.601215+00:00 | 2 | 150 | 1.134419 | 0 | null | book_playout |
7k/8/1R6/8/8/6K1/8/8 b - - 0 1 | h8g7 | -20,000 | [
{
"uci": "h8g7",
"prob": 0.3333333432674408,
"cp": -20000,
"eval_type": "cp",
"rank": 1,
"pv": [
"h8g7",
"g3h4",
"g7f7",
"h4h5",
"f7g7",
"b6g6",
"g7f7",
"g6c6"
]
},
{
"uci": "h8g8",
"prob": 0.3333333432674408,
"cp": -20000,
... | 14 | 3 | 120 | multipv_topk | 3 | endgame | 2 | 1 | exp190_phase_deep | 2026-07-10T17:22:11.604503+00:00 | 0 | 0 | 1.098612 | 0 | null | endgame_template |
8/8/8/3p4/3K4/7Q/1k6/8 b - - 0 1 | b2c2 | -99,994 | [
{
"uci": "b2c2",
"prob": 0.2016688585281372,
"cp": -99994,
"eval_type": "mate",
"rank": 1,
"pv": [
"b2c2",
"h3d3",
"c2b2",
"d4d5",
"b2a1",
"d3e2",
"a1b1",
"d5c4"
]
},
{
"uci": "b2a2",
"prob": 0.2016688585281372,
"cp": -99994... | 15 | 5 | 120 | multipv_topk | 5 | endgame | 2 | 1 | exp190_phase_deep | 2026-07-10T17:22:11.701712+00:00 | 0 | 0 | 1.60941 | -4 | null | endgame_template |
rnb3n1/ppp1qkR1/3p4/3P1p2/8/8/PPP1PPP1/RN1QKB2 b Q - 0 10 | f7g7 | 235 | [
{
"uci": "f7g7",
"prob": 0.997866690158844,
"cp": 235,
"eval_type": "cp",
"rank": 1,
"pv": [
"f7g7",
"a2a4",
"b8d7",
"a1a3",
"d7c5",
"a3h3",
"g8f6"
]
},
{
"uci": "f7f8",
"prob": 0.0009565898217260838,
"cp": -599,
"eval_type": ... | 12 | 4 | 120 | multipv_topk | 4 | opening | 0 | 19 | exp190_phase_deep | 2026-07-10T17:22:11.899495+00:00 | 2 | 834 | 0.017532 | 0 | null | book_playout |
1n2kbnr/1pp2ppp/2r5/p2Kp3/4P3/8/PPP3PP/RNBQ2NR b k - 4 10 | c6c5 | 99,999 | [
{
"uci": "c6c5",
"prob": 0.33519411087036133,
"cp": 99999,
"eval_type": "mate",
"rank": 1,
"pv": [
"c6c5"
]
},
{
"uci": "b8d7",
"prob": 0.3324029743671417,
"cp": 99998,
"eval_type": "mate",
"rank": 2,
"pv": [
"b8d7",
"b2b4",
"g8f6"
... | 12 | 8 | 120 | multipv_topk | 33 | opening | 0 | 19 | exp190_phase_deep | 2026-07-10T17:22:11.902433+00:00 | 2 | 1 | 1.098605 | 2 | null | book_playout |
rnb2bnr/pp3kpp/8/4p3/8/2N5/PPPq1PPP/R1B1K1NR w KQ - 0 8 | c1d2 | -371 | [
{
"uci": "c1d2",
"prob": 0.7011494040489197,
"cp": -371,
"eval_type": "cp",
"rank": 1,
"pv": [
"c1d2",
"b8c6",
"g1f3",
"g8f6",
"e1c1",
"c8g4",
"f3g5",
"f7g8"
]
},
{
"uci": "e1d2",
"prob": 0.2780277132987976,
"cp": -482,
... | 13 | 3 | 120 | multipv_topk | 3 | opening | 0 | 16 | exp190_phase_deep | 2026-07-10T17:22:12.397629+00:00 | 0 | 111 | 0.685437 | 0 | null | book_playout |
r4bnr/1p1kpppp/3p4/p1p1N3/4P3/1P5P/P1PP1P2/RNBQK3 b Q - 2 9 | d6e5 | -568 | [
{
"uci": "d6e5",
"prob": 0.42881250381469727,
"cp": -568,
"eval_type": "cp",
"rank": 1,
"pv": [
"d6e5",
"c1b2",
"f7f6",
"e1f1",
"e7e6",
"b1a3",
"d7e8",
"a3c4"
]
},
{
"uci": "d7e8",
"prob": 0.2373066246509552,
"cp": -639,
... | 13 | 6 | 120 | multipv_topk | 6 | opening | 0 | 17 | exp190_phase_deep | 2026-07-10T17:22:12.400618+00:00 | 0 | 71 | 1.433564 | -2 | null | book_playout |
6q1/5P2/7K/3Q4/8/8/8/3k4 b - - 0 1 | d1c2 | -99,996 | [
{
"uci": "d1c2",
"prob": 0.25104522705078125,
"cp": -99996,
"eval_type": "mate",
"rank": 1,
"pv": [
"d1c2",
"f7g8q",
"c2c3",
"d5c4",
"c3d2",
"g8g2",
"d2e3",
"g2e2"
]
},
{
"uci": "d1c1",
"prob": 0.25104522705078125,
"cp": -99... | 16 | 4 | 120 | multipv_topk | 4 | endgame | 2 | 1 | exp190_phase_deep | 2026-07-10T17:22:12.498972+00:00 | 0 | 0 | 1.386286 | -3 | null | endgame_template |
rnbqkbnr/ppppp2p/6p1/5p1Q/4P3/8/PPPP1PPP/RNB1KBNR w KQkq - 0 3 | h5h4 | -34 | [
{
"uci": "h5h4",
"prob": 0.1833002269268036,
"cp": -34,
"eval_type": "cp",
"rank": 1,
"pv": [
"h5h4",
"e7e5",
"h4d8",
"e8d8",
"g1f3",
"b8c6",
"f3g5",
"g8h6"
]
},
{
"uci": "h5g5",
"prob": 0.1700555980205536,
"cp": -43,
"e... | 10 | 8 | 120 | multipv_topk | 39 | opening | 0 | 6 | exp190_phase_deep | 2026-07-10T17:22:12.598630+00:00 | 1 | 9 | 1.939074 | 0 | null | book_playout |
1R6/k6K/8/8/8/8/5R2/8 w - - 0 1 | f2b2 | 99,998 | [
{
"uci": "f2b2",
"prob": 0.12577953934669495,
"cp": 99998,
"eval_type": "mate",
"rank": 1,
"pv": [
"f2b2",
"a7a6",
"b2a2"
]
},
{
"uci": "b8b3",
"prob": 0.12577953934669495,
"cp": 99998,
"eval_type": "mate",
"rank": 2,
"pv": [
"b8b3",
... | 15 | 8 | 120 | multipv_topk | 33 | endgame | 2 | 2 | exp190_phase_deep | 2026-07-10T17:22:12.600442+00:00 | 2 | 0 | 2.079418 | 4 | null | endgame_template |
5k2/2K5/8/8/3R4/8/8/8 b - - 0 1 | f8f7 | -99,988 | [
{
"uci": "f8f7",
"prob": 0.20166638493537903,
"cp": -99988,
"eval_type": "mate",
"rank": 1,
"pv": [
"f8f7",
"d4d6",
"f7e7",
"d6c6",
"e7e8",
"c6e6",
"e8f8",
"c7d7"
]
},
{
"uci": "f8e8",
"prob": 0.20166638493537903,
"cp": -999... | 16 | 5 | 120 | multipv_topk | 5 | endgame | 2 | 1 | exp190_phase_deep | 2026-07-10T17:22:12.797334+00:00 | 0 | 0 | 1.60941 | -10 | null | endgame_template |
r1bqk1nr/pppp1pp1/7p/4P3/6P1/8/PPPPBb1P/RNBQK2R w KQkq - 0 8 | e1f2 | 263 | [
{
"uci": "e1f2",
"prob": 0.9529492259025574,
"cp": 263,
"eval_type": "cp",
"rank": 1,
"pv": [
"e1f2",
"h6h5",
"h2h4",
"h5g4",
"d2d4",
"h8h4",
"c1f4"
]
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{
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End of preview.
exp190 — Phase-balanced deep MultiPV soft targets
Stockfish 18 MultiPV soft-policy labels with phase quotas so training
does not drown in openings. Built for policy-only (no-MCTS) ChessTransformer
finetunes such as avewright/chess-transformer-200m-maxelo.
Motivation
Naive HF streaming + shallow MultiPV skews toward openings. Elo without search is decided in middlegame/endgame. This harvest enforces:
| Phase | Target share | Label depth |
|---|---|---|
| Opening | 22% | 10–14 |
| Middlegame | 48% | 12–16 |
| Endgame | 30% | 14–18 |
Contents
| Path | Description |
|---|---|
soft_cache.pt |
Torch cache ready for exp189-style training |
data/*.jsonl |
Raw labeled positions (FEN + MultiPV soft targets) |
status.json |
Harvest counters at upload time |
ARCHITECTURE.md |
Design notes for stratified training |
soft_cache.pt tensors
board_array, turn, castling, ep_square, move_idx, cp, mate,
soft_indices, soft_probs, phase, label_depth.
Phase encoding: 0=opening, 1=middlegame, 2=endgame.
How it was generated
- Engine: Stockfish 18 (
x86-64-vnni512), full strength, MultiPV 8 - FEN sources: HF position streams, book playouts, endgame templates, random walks
- Deficit-first producer + hard phase gate at writer
- Syzygy tablebases when available
- Code:
experiments/exp190_phase_deep_harvest.pyin avewright/transform
Recommended training use
- Mix with shallow volume (
exp186-sf-multipv-2m) at ~30–40% deep / 60–70% shallow - Stratify batches by
phase(1/3 each) so gradients never bog on openings - Optional depth weight:
w = label_depth / mean_depth(clip 0.5–1.5)
Related
- Shallow soft:
avewright/exp186-sf-multipv-2m - Model trained with this mix:
avewright/chess-transformer-200m-maxelo - Progress write-up:
docs/PROGRESS_2026-07-10.mdin the transform repo
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