You are the Guesser being evaluated in a Twenty Questions benchmark. One subject is hidden. The initial BEGIN message provides its broad category as trusted game metadata. Identify the subject using as few counted questions as possible. ASK is only for learning a property that helps distinguish possible candidates. Never use ASK to confirm a named candidate or ask whether the subject is a specific identity. When you are ready to name a candidate, use GUESS immediately. A correct GUESS costs zero counted questions; an incorrect GUESS costs exactly one, the same as ASK. A GUESS must provide both a name and a short identifying description. The engine replies only YES, NO, or UNKNOWN; UNKNOWN is a valid answer meaning the factual adjudication system could not determine the proposition under its evidence policy. Questions requiring proof of absence, exclusivity, completeness, exact counts, or subjective classification are more likely to return UNKNOWN. Prefer direct, positively verifiable properties when possible. The initial BEGIN event includes an opaque variation_token that contains no information about the hidden subject. Do not interpret, repeat, mention, or derive meaning from it. After BEGIN, each user reply is either one adjudicated YES, NO, or UNKNOWN token or a fixed FORMAT_ERROR event. FORMAT_ERROR means your immediately preceding response did not match the required structured-action contract, was not semantically adjudicated, and consumed one counted turn. Use the formats in that event and try again. Never infer that the attempted question or guess was right or wrong. At most 50 questions or rejected guesses are counted. After that limit you receive one final guess-only opportunity. Format errors also consume counted turns. The provider wire response is an object with exactly one `result` action. On the final opportunity ASK is forbidden. Return only the required structured response. Do not include analysis, hidden reasoning, or additional fields.
Round 2
Round 2
Identified Albert Schweitzer in 38 counted questions.
Back to all Albert Schweitzer rounds- Questions
- 38
- Outcome
- Solved
- Format errors
- Errors found View one example
- Duration
- 16m 0s
- Round cost
- $0.4745 All 39 turns
Format warning
The model sent replies in the wrong format.
The Guesser sent 10 invalid replies. 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
- 74.4%
- Format errors
- 10
- Turns used by format errors
- 10
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.
{"category":"person","event":"BEGIN","variation_token":"BKXG3AZI"}Valid replies are shown in the required format. Rejected replies are shown separately, without provider or call IDs.
Is the person male?
Recorded Guesser outputRequired JSON format
{"result":{"action":"ASK","description":null,"name":null,"question":"Is the person male?"}}Oracle evidence2 model-reported sources
The Oracle reported these excerpts and URLs. They are not independently checked.
Together with his wife, who was a nurse, he built and ran a hospital at the mission station Lambarene in Gabon.Open nobelprize.org (opens in a new tab)
In 1912 Schweitzer and Hélène Bresslau were married, and his wife studied nursing to help her husband.Open kids.britannica.com (opens in a new tab)
Is the person currently alive?
Recorded Guesser outputRequired JSON format
{"result":{"action":"ASK","description":null,"name":null,"question":"Is the person currently alive?"}}Oracle evidence1 model-reported source
The Oracle reported these excerpts and URLs. They are not independently checked.
Albert Schweitzer ... Died: 4 September 1965, Lambaréné, GabonOpen nobelprize.org (opens in a new tab)
Is the person primarily known as a political leader?
Recorded Guesser outputRequired JSON format
{"result":{"action":"ASK","description":null,"name":null,"question":"Is the person primarily known as a political leader?"}}Oracle evidence2 model-reported sources
The Oracle reported these excerpts and URLs. They are not independently checked.
Profession: Doctor of Philosophy, Theology and Medicine. Musician and missionary. Albert Schweitzer was nominated for his humanitarian work...Open nobelprize.org (opens in a new tab)
Dr. Schweitzer was a physician, philosopher, theologian, organist and humanitarian... known for his charitable work including opening a hospital in Africa.Open interlochenpublicradio.org (opens in a new tab)
Is the person primarily known for contributions to the field of science (e.g., physics, biology, chemistry, mathematics)?
Recorded Guesser outputRequired JSON format
{"result":{"action":"ASK","description":null,"name":null,"question":"Is the person primarily known for contributions to the field of science (e.g., physics, biology, chemistry, mathematics)?"}}Oracle evidence2 model-reported sources
The Oracle reported these excerpts and URLs. They are not independently checked.
He is best known for founding the mission hospital at Lambaréné, providing medical aid to thousands.Open artuk.org (opens in a new tab)
Albert Schweitzer was nominated for his humanitarian work on a religious basis... he and his wife set up a hospital.Open nobelprize.org (opens in a new tab)
Is the person primarily known for contributions to the entertainment industry (music, film, television)?
Recorded Guesser outputRequired JSON format
{"result":{"action":"ASK","description":null,"name":null,"question":"Is the person primarily known for contributions to the entertainment industry (music, film, television)?"}}Oracle evidence2 model-reported sources
The Oracle reported these excerpts and URLs. They are not independently checked.
He is best known for founding the mission hospital at Lambaréné, providing medical aid to thousands.Open npg.org.uk (opens in a new tab)
He was ... recognized as a concert organist, internationally known.Open nobelprize.org (opens in a new tab)
Is the person primarily known for contributions to literature (novels, poetry, plays)?
Recorded Guesser outputRequired JSON format
{"result":{"action":"ASK","description":null,"name":null,"question":"Is the person primarily known for contributions to literature (novels, poetry, plays)?"}}Oracle evidence2 model-reported sources
The Oracle reported these excerpts and URLs. They are not independently checked.
He is best known for founding the mission hospital at Lambaréné, providing medical aid to thousands.Open artuk.org (opens in a new tab)
Physician, musician and philosopherOpen npg.org.uk (opens in a new tab)
Is the person primarily known for contributions to sports (e.g., athlete, coach, or sports figure)?
Recorded Guesser outputRequired JSON format
{"result":{"action":"ASK","description":null,"name":null,"question":"Is the person primarily known for contributions to sports (e.g., athlete, coach, or sports figure)?"}}Oracle evidence2 model-reported sources
The Oracle reported these excerpts and URLs. They are not independently checked.
He is best known for founding the mission hospital at Lambaréné, providing medical aid to thousands.Open artuk.org (opens in a new tab)
Albert Schweitzer was awarded the Nobel Peace Prize for his philosophy of “reverence for life” and tireless humanitarian work.Open nobelprize.org (opens in a new tab)
Is the person primarily known for contributions to visual arts (painting, sculpture, photography, etc.)?
Recorded Guesser outputRequired JSON format
{"result":{"action":"ASK","description":null,"name":null,"question":"Is the person primarily known for contributions to visual arts (painting, sculpture, photography, etc.)?"}}Oracle evidence2 model-reported sources
The Oracle reported these excerpts and URLs. They are not independently checked.
He is best known for founding the mission hospital at Lambaréné, providing medical aid to thousands.Open artuk.org (opens in a new tab)
Schweitzer was awarded the Nobel Peace Prize for his philosophy of “reverence for life” and tireless humanitarian work.Open nobelprize.org (opens in a new tab)
Is the person primarily known for their role in a major world religion?
Recorded Guesser outputRequired JSON format
{"result":{"action":"ASK","description":null,"name":null,"question":"Is the person primarily known for their role in a major world religion?"}}Is the person primarily known for founding or leading a major corporation or business?
Recorded Guesser outputRequired JSON format
{"result":{"action":"ASK","description":null,"name":null,"question":"Is the person primarily known for founding or leading a major corporation or business?"}}Oracle evidence2 model-reported sources
The Oracle reported these excerpts and URLs. They are not independently checked.
Albert Schweitzer was awarded the Nobel Peace Prize for his philosophy of “reverence for life” and tireless humanitarian work.Open nobelprize.org (opens in a new tab)
Dr. Albert Schweitzer, a renowned medical missionary... founded a hospital in Lambaréné.Open pbs.org (opens in a new tab)
Is the person primarily known for contributions to philosophy?
Recorded Guesser outputRequired JSON format
{"result":{"action":"ASK","description":null,"name":null,"question":"Is the person primarily known for contributions to philosophy?"}}Oracle evidence2 model-reported sources
The Oracle reported these excerpts and URLs. They are not independently checked.
Schweitzer is known for his charitable work including opening a hospital in Africa.Open interlochenpublicradio.org (opens in a new tab)
Albert Schweitzer was awarded the Nobel Peace Prize for his philosophy of “reverence for life” and tireless humanitarian work.Open nobelprize.org (opens in a new tab)
Is the person primarily known for being a military commander or general?
Recorded Guesser outputRequired JSON format
{"result":{"action":"ASK","description":null,"name":null,"question":"Is the person primarily known for being a military commander or general?"}}Oracle evidence2 model-reported sources
The Oracle reported these excerpts and URLs. They are not independently checked.
Albert Schweitzer was awarded the Nobel Peace Prize for his philosophy of “reverence for life” and tireless humanitarian work.Open nobelprize.org (opens in a new tab)
Profession: Doctor of Philosophy, Theology and Medicine. Musician and missionary.Open nobelprize.org (opens in a new tab)
Is the person primarily known for being an explorer or adventurer?
Recorded Guesser outputRequired JSON format
{"result":{"action":"ASK","description":null,"name":null,"question":"Is the person primarily known for being an explorer or adventurer?"}}Oracle evidence2 model-reported sources
The Oracle reported these excerpts and URLs. They are not independently checked.
Doctor, Missionary, Philosopher and Musician... he built and ran a hospital at the mission station Lambarene in Gabon.Open nobelprize.org (opens in a new tab)
Albert Schweitzer was nominated... for his humanitarian work... In 1913 he arrived at Lambaréné where he and his wife set up a hospital.Open nobelprize.org (opens in a new tab)
Did the person found a major world religion?
Recorded Guesser outputRequired JSON format
{"result":{"action":"ASK","description":null,"name":null,"question":"Did the person found a major world religion?"}}Is the person primarily known as a religious prophet or spiritual teacher?
Recorded Guesser outputRequired JSON format
{"result":{"action":"ASK","description":null,"name":null,"question":"Is the person primarily known as a religious prophet or spiritual teacher?"}}Oracle evidence2 model-reported sources
The Oracle reported these excerpts and URLs. They are not independently checked.
Musician, theologian and physician, Albert Schweitzer was above all, a true humanitarian.Open pmc.ncbi.nlm.nih.gov (opens in a new tab)
He studied theology and became a priest, but that was not enough. He wanted to alleviate suffering, and accordingly studied medicine.Open nobelprize.org (opens in a new tab)
Is the person primarily known for committing murders?
Recorded Guesser outputRequired JSON format
{"result":{"action":"ASK","description":null,"name":null,"question":"Is the person primarily known for committing murders?"}}Oracle evidence2 model-reported sources
The Oracle reported these excerpts and URLs. They are not independently checked.
Doctor, Missionary, Philosopher and Musician ... tireless humanitarian workOpen nobelprize.org (opens in a new tab)
Albert Schweitzer was awarded the Nobel Peace Prize for his philosophy of “reverence for life” and tireless humanitarian work.Open nobelprize.org (opens in a new tab)
Is the person primarily known for their contributions to law or jurisprudence?
Recorded Guesser outputRequired JSON format
{"result":{"action":"ASK","description":null,"name":null,"question":"Is the person primarily known for their contributions to law or jurisprudence?"}}Oracle evidence2 model-reported sources
The Oracle reported these excerpts and URLs. They are not independently checked.
Doctor, Missionary, Philosopher and Musician... Albert Schweitzer received his Nobel Prize for tireless humanitarian work.Open nobelprize.org (opens in a new tab)
Dr. Schweitzer was a physician, philosopher, theologian, organist and humanitarian... known for his charitable work including opening a hospital in Africa.Open interlochenpublicradio.org (opens in a new tab)
Is the person primarily known for being an engineer or inventor?
Recorded Guesser outputRequired JSON format
{"result":{"action":"ASK","description":null,"name":null,"question":"Is the person primarily known for being an engineer or inventor?"}}Oracle evidence2 model-reported sources
The Oracle reported these excerpts and URLs. They are not independently checked.
He is best known for founding the mission hospital at Lambaréné, providing medical aid to thousands.Open artuk.org (opens in a new tab)
Profession: Doctor of Philosophy, Theology and Medicine. Musician and missionaryOpen nobelprize.org (opens in a new tab)
Is the person primarily known as a saint in a major world religion?
Recorded Guesser outputRequired JSON format
{"result":{"action":"ASK","description":null,"name":null,"question":"Is the person primarily known as a saint in a major world religion?"}}Oracle evidence2 model-reported sources
The Oracle reported these excerpts and URLs. They are not independently checked.
Albert Schweitzer was awarded the Nobel Peace Prize for his philosophy of “reverence for life” and tireless humanitarian work.Open nobelprize.org (opens in a new tab)
Profession: Doctor of Philosophy, Theology and Medicine. Musician and missionary.Open nobelprize.org (opens in a new tab)
Is the person known for practicing and advocating Satyagraha (principles of non‑violent resistance)?
Recorded Guesser outputRequired JSON format
{"result":{"action":"ASK","description":null,"name":null,"question":"Is the person known for practicing and advocating Satyagraha (principles of non‑violent resistance)?"}}Is the person primarily known for contributions to economics?
Recorded Guesser outputRequired JSON format
{"result":{"action":"ASK","description":null,"name":null,"question":"Is the person primarily known for contributions to economics?"}}Oracle evidence2 model-reported sources
The Oracle reported these excerpts and URLs. They are not independently checked.
Albert Schweitzer was awarded the Nobel Peace Prize for his philosophy of “reverence for life” and tireless humanitarian work.Open nobelprize.org (opens in a new tab)
Albert Schweitzer | Alsatian Theologian, Philosopher & PhysicianOpen britannica.com (opens in a new tab)
Did the person receive a Nobel Peace Prize?
Recorded Guesser outputRequired JSON format
{"result":{"action":"ASK","description":null,"name":null,"question":"Did the person receive a Nobel Peace Prize?"}}Oracle evidence1 model-reported source
The Oracle reported these excerpts and URLs. They are not independently checked.
The Nobel Peace Prize 1952 was awarded to Albert Schweitzer.Open nobelprize.org (opens in a new tab)
Reply in the wrong format.
Output limit exceeded · fixed format reminder sent
Why this reply was rejectedOutput limit exceeded · turn 23
The reply hit the output length limit before it was complete.
- Recorded type
output_limit_exceeded- Turn
- 23
- Counted
- Yes · question 23
- Feedback
- FORMAT_ERROR
The provider returned no text.
{"result":{"action":"ASK","description":null,"name":null,"question":"<non-empty yes-or-no property question>"}}{"result":{"action":"GUESS","description":"<non-empty identifying description>","name":"<non-empty candidate name>","question":null}} A reply must match one of these formats exactly. Text fields in use must not be empty; unused fields must be JSON null.
Is the person primarily known for founding a major humanitarian organization?
Recorded Guesser outputRequired JSON format
{"result":{"action":"ASK","description":null,"name":null,"question":"Is the person primarily known for founding a major humanitarian organization?"}}Did the person serve as Secretary-General of the United Nations?
Recorded Guesser outputRequired JSON format
{"result":{"action":"ASK","description":null,"name":null,"question":"Did the person serve as Secretary-General of the United Nations?"}}Oracle evidence1 model-reported source
The Oracle reported these excerpts and URLs. They are not independently checked.
Former Secretaries-General: Ban Ki-moon, Kofi Annan, Boutros Boutros-Ghali, Javier Perez de Cuellar, Kurt Waldheim, U Thant, Dag Hjalmar Agne Carl Hammarskjöld, Trygve Halvdan Lie.Open un.org (opens in a new tab)
Did the person co‑found the International Committee of the Red Cross (ICRC)?
Recorded Guesser outputRequired JSON format
{"result":{"action":"ASK","description":null,"name":null,"question":"Did the person co‑found the International Committee of the Red Cross (ICRC)?"}}Oracle evidence1 model-reported source
The Oracle reported these excerpts and URLs. They are not independently checked.
The five founders of the ICRC: Gustave Moynier, Théodore Maunoir, Guillaume Dufour, Henry Dunant, and Louis Appia.Open avarchives.icrc.org (opens in a new tab)
Reply in the wrong format.
Output limit exceeded · fixed format reminder sent
Why this reply was rejectedOutput limit exceeded · turn 27
The reply hit the output length limit before it was complete.
- Recorded type
output_limit_exceeded- Turn
- 27
- Counted
- Yes · question 27
- Feedback
- FORMAT_ERROR
The provider returned no text.
{"result":{"action":"ASK","description":null,"name":null,"question":"<non-empty yes-or-no property question>"}}{"result":{"action":"GUESS","description":"<non-empty identifying description>","name":"<non-empty candidate name>","question":null}} A reply must match one of these formats exactly. Text fields in use must not be empty; unused fields must be JSON null.
Reply in the wrong format.
Output limit exceeded · fixed format reminder sent
Why this reply was rejectedOutput limit exceeded · turn 28
The reply hit the output length limit before it was complete.
- Recorded type
output_limit_exceeded- Turn
- 28
- Counted
- Yes · question 28
- Feedback
- FORMAT_ERROR
The provider returned no text.
{"result":{"action":"ASK","description":null,"name":null,"question":"<non-empty yes-or-no property question>"}}{"result":{"action":"GUESS","description":"<non-empty identifying description>","name":"<non-empty candidate name>","question":null}} A reply must match one of these formats exactly. Text fields in use must not be empty; unused fields must be JSON null.
Reply in the wrong format.
Output limit exceeded · fixed format reminder sent
Why this reply was rejectedOutput limit exceeded · turn 29
The reply hit the output length limit before it was complete.
- Recorded type
output_limit_exceeded- Turn
- 29
- Counted
- Yes · question 29
- Feedback
- FORMAT_ERROR
The provider returned no text.
{"result":{"action":"ASK","description":null,"name":null,"question":"<non-empty yes-or-no property question>"}}{"result":{"action":"GUESS","description":"<non-empty identifying description>","name":"<non-empty candidate name>","question":null}} A reply must match one of these formats exactly. Text fields in use must not be empty; unused fields must be JSON null.
Reply in the wrong format.
Output limit exceeded · fixed format reminder sent
Why this reply was rejectedOutput limit exceeded · turn 30
The reply hit the output length limit before it was complete.
- Recorded type
output_limit_exceeded- Turn
- 30
- Counted
- Yes · question 30
- Feedback
- FORMAT_ERROR
The provider returned no text.
{"result":{"action":"ASK","description":null,"name":null,"question":"<non-empty yes-or-no property question>"}}{"result":{"action":"GUESS","description":"<non-empty identifying description>","name":"<non-empty candidate name>","question":null}} A reply must match one of these formats exactly. Text fields in use must not be empty; unused fields must be JSON null.
Is the person from the United States?
Recorded Guesser outputRequired JSON format
{"result":{"action":"ASK","description":null,"name":null,"question":"Is the person from the United States?"}}Oracle evidence2 model-reported sources
The Oracle reported these excerpts and URLs. They are not independently checked.
Albert Schweitzer — Born: 14 January 1875, Kaysersberg, Germany (now France).Open nobelprize.org (opens in a new tab)
Citizenship | German (1875–1919) French (1919–1965)Open sco.wikipedia.org (opens in a new tab)
Reply in the wrong format.
Output limit exceeded · fixed format reminder sent
Why this reply was rejectedOutput limit exceeded · turn 32
The reply hit the output length limit before it was complete.
- Recorded type
output_limit_exceeded- Turn
- 32
- Counted
- Yes · question 32
- Feedback
- FORMAT_ERROR
The provider returned no text.
{"result":{"action":"ASK","description":null,"name":null,"question":"<non-empty yes-or-no property question>"}}{"result":{"action":"GUESS","description":"<non-empty identifying description>","name":"<non-empty candidate name>","question":null}} A reply must match one of these formats exactly. Text fields in use must not be empty; unused fields must be JSON null.
Reply in the wrong format.
Output limit exceeded · fixed format reminder sent
Why this reply was rejectedOutput limit exceeded · turn 33
The reply hit the output length limit before it was complete.
- Recorded type
output_limit_exceeded- Turn
- 33
- Counted
- Yes · question 33
- Feedback
- FORMAT_ERROR
The provider returned no text.
{"result":{"action":"ASK","description":null,"name":null,"question":"<non-empty yes-or-no property question>"}}{"result":{"action":"GUESS","description":"<non-empty identifying description>","name":"<non-empty candidate name>","question":null}} A reply must match one of these formats exactly. Text fields in use must not be empty; unused fields must be JSON null.
Is the person primarily known for founding a major humanitarian organization?
Recorded Guesser outputRequired JSON format
{"result":{"action":"ASK","description":null,"name":null,"question":"Is the person primarily known for founding a major humanitarian organization?"}}Oracle evidence2 model-reported sources
The Oracle reported these excerpts and URLs. They are not independently checked.
Doctor, Missionary, Philosopher and Musician... Together with his wife... he built and ran a hospital at the mission station Lambarene.Open nobelprize.org (opens in a new tab)
He lived his philosophy of “reverence for life” by becoming a medical doctor and establishing a hospital in Lambaréné, Gabon.Open britannica.com (opens in a new tab)
Reply in the wrong format.
Output limit exceeded · fixed format reminder sent
Why this reply was rejectedOutput limit exceeded · turn 35
The reply hit the output length limit before it was complete.
- Recorded type
output_limit_exceeded- Turn
- 35
- Counted
- Yes · question 35
- Feedback
- FORMAT_ERROR
The provider returned no text.
{"result":{"action":"ASK","description":null,"name":null,"question":"<non-empty yes-or-no property question>"}}{"result":{"action":"GUESS","description":"<non-empty identifying description>","name":"<non-empty candidate name>","question":null}} A reply must match one of these formats exactly. Text fields in use must not be empty; unused fields must be JSON null.
Reply in the wrong format.
Output limit exceeded · fixed format reminder sent
Why this reply was rejectedOutput limit exceeded · turn 36
The reply hit the output length limit before it was complete.
- Recorded type
output_limit_exceeded- Turn
- 36
- Counted
- Yes · question 36
- Feedback
- FORMAT_ERROR
The provider returned no text.
{"result":{"action":"ASK","description":null,"name":null,"question":"<non-empty yes-or-no property question>"}}{"result":{"action":"GUESS","description":"<non-empty identifying description>","name":"<non-empty candidate name>","question":null}} A reply must match one of these formats exactly. Text fields in use must not be empty; unused fields must be JSON null.
Reply in the wrong format.
Output limit exceeded · fixed format reminder sent
Why this reply was rejectedOutput limit exceeded · turn 37
The reply hit the output length limit before it was complete.
- Recorded type
output_limit_exceeded- Turn
- 37
- Counted
- Yes · question 37
- Feedback
- FORMAT_ERROR
The provider returned no text.
{"result":{"action":"ASK","description":null,"name":null,"question":"<non-empty yes-or-no property question>"}}{"result":{"action":"GUESS","description":"<non-empty identifying description>","name":"<non-empty candidate name>","question":null}} A reply must match one of these formats exactly. Text fields in use must not be empty; unused fields must be JSON null.
Was the person a physician?
Recorded Guesser outputRequired JSON format
{"result":{"action":"ASK","description":null,"name":null,"question":"Was the person a physician?"}}Oracle evidence2 model-reported sources
The Oracle reported these excerpts and URLs. They are not independently checked.
Profession: Doctor of Philosophy, Theology and Medicine. Musician and missionaryOpen nobelprize.org (opens in a new tab)
Albert Schweitzer | Alsatian Theologian, Philosopher & PhysicianOpen britannica.com (opens in a new tab)
Albert Schweitzer
German‑French physician, humanitarian missionary, and Nobel Peace Prize laureate
Validator rationale The proposed identity names Albert Schweitzer and its description matches the trusted person.
Recorded Guesser outputRequired JSON format
{"result":{"action":"GUESS","description":"German‑French physician, humanitarian missionary, and Nobel Peace Prize laureate","name":"Albert Schweitzer","question":null}}