Claude Fable 5.1 (high) on Albert Schweitzer - Round 1

Round 1

Identified Albert Schweitzer in 18 counted questions.

Questions: 18
Outcome: Solved
Format errors: Errors found View one example
Duration: 5m 23s
Round cost: $0.3291 All 19 turns

Format warning

The model sent replies in the wrong format.

The Guesser sent 1 invalid reply. Each one before the question limit used up a counted turn. The model was only reminded of the required format; it was never told whether its question or guess was correct.

Valid format: 94.7%
Format errors: 1
Turns used by format errors: 1

Transcript

Questions and answers.

Turns are shown in the order they happened. Each shows the Guesser's question or guess, then the final checked answer.

Exact Guesser setupSystem message and BEGIN event

The Guesser received these messages at the start of the round. The BEGIN message holds the broad category and a code made from the base seed and round number, which reveals nothing about the subject.

System message

You are the Guesser in a Twenty Questions benchmark. Identify the hidden subject using as few
counted turns as possible. BEGIN provides only its broad category. The variation_token has no
clues; do not interpret, mention, or repeat it.

The category in BEGIN has a broad meaning:
- person: a real human, living or historical.
- fictional_character: an invented character from a story, book, comic, film, television,
game, or another fictional work.
- mythological_figure: a figure from mythology or traditional legend.
- video_game_character: a character known from video games.
- thing: a broad category covering natural and human-made entities, living or nonliving,
whole entities or parts of them. Possibilities include everyday objects, tools, machines,
materials, food, animals, plants, body parts, natural structures, geographical features,
celestial bodies, natural phenomena, and concepts. These possibilities are not exhaustive.
The target may be a general kind or one particular instance.

Use questions to narrow the supplied category. These definitions are not a list of targets.

Use ASK for a factual question that distinguishes candidates. Never use ASK to confirm a
specific identity. Use GUESS with a name and short identifying description to name a candidate.

ASK has five possible replies:
- YES or NO: the evidence establishes that answer to the exact question.
- RATHER_YES or RATHER_NO: evidence leans that way, but is not strong enough for a firm answer.
Treat this as a clue; keep candidates fitting the opposite answer possible.
- UNKNOWN: no reliable direction. It supports neither answer.

Ask clear questions about verifiable properties. "Can", "sometimes", "usually", "always", and
"mainly" ask different things. Do not assume that one property proves another or rules out alternatives.
Qualified replies express uncertainty about your question, not how often a property applies.
Before narrowing heavily, check your key assumption with a different property. After rejected
guesses, reconsider earlier assumptions as well as candidates. Answers can be mistaken; check
another property when stuck. Do not ignore an answer merely because it conflicts with a
preferred candidate.

Each ASK, rejected GUESS, or format error before the limit costs one turn. A correct GUESS costs
none. After 40 counted turns, make one final GUESS; ASK is then forbidden. Identity
validation uses only YES, NO, or UNKNOWN. UNKNOWN on GUESS ends the game without success.

FORMAT_ERROR means your output broke the contract, was not checked for correctness, and cost
one turn. Retry using its displayed formats if a turn remains. Return only the required JSON
object with exactly one result action. No explanations, reasoning, or extra fields.

BEGIN event

{"category":"person","event":"BEGIN","variation_token":"EAQCORIU"}

Valid replies are shown in the required format. Rejected replies are shown separately, without provider or call IDs.

1 · Guesser asks

Is the person currently alive?

Recorded Guesser outputRequired JSON format

{"result":{"action":"ASK","description":null,"name":null,"question":"Is the person currently alive?"}}

Oracle evidence2 model-reported sources

The Oracle reported these excerpts and URLs. They are not independently checked.

Source 01

Albert Schweitzer — Born: 14 January 1875 ... Died: 4 September 1965, Lambaréné, Gabon.

Component	Calls	Total tokens	Input	Cached input	Cache write	Output	Reasoning	Latency	Cost	Cache savings
Guesser	19	45,225	40,758	37,953	2,729	4,467	3,508	154.22 s	$0.2677	$0.3632
Oracle, Reviewer, Judge	17	130,757	116,451	54,863	0	14,306	6,179	166.63 s	$0.0612	$0.0000
Validator	1	689	653	0	0	36	0	2.20 s	$0.0002	$0.0000

The model sent replies in the wrong format.

Is the person currently alive?

Did the person die before the year 1900?

Was the person primarily known for work in politics or government (e.g., as a head of state, politician, or military leader)?

Was the person primarily known as an entertainer or artist (e.g., actor, musician, writer, painter)?

Was the person primarily known for work in science, mathematics, or technology (e.g., as a scientist, inventor, or engineer)?

Was the person primarily known as a sports athlete or sports competitor?

Was the person primarily known as a religious or spiritual leader?

Was the person primarily known as a business leader or entrepreneur?

Reply in the wrong format.

Was the person primarily known as an explorer, adventurer, or aviator?

Was the person primarily known as a criminal, outlaw, or for committing a crime?

Was the person primarily known as an activist, social reformer, or humanitarian?

Was the person a woman?

Was the person born in the United States?

Was the person born in Europe?

Did the person receive the Nobel Peace Prize?

Did the person die before 1950?

Did the person die before 1980?

Albert Schweitzer