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 47 counted questions.
Back to all Albert Schweitzer rounds- Questions
- 47
- Outcome
- Solved
- Format errors
- No errors
- Duration
- 1h 40m
- Round cost
- $1.8584 All 48 turns
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 this person alive?
Recorded Guesser outputRequired JSON format
{"result":{"action":"ASK","description":null,"name":null,"question":"Is this person 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 this person male?
Recorded Guesser outputRequired JSON format
{"result":{"action":"ASK","description":null,"name":null,"question":"Is this person male?"}}Oracle evidence2 model-reported sources
The Oracle reported these excerpts and URLs. They are not independently checked.
He was awarded the 1952 Nobel peace prize ... Schweitzer died in Lambaréné on Sept. 4, 1965.Open kids.britannica.com (opens in a new tab)
Albert Schweitzer was awarded the Nobel Peace Prize ... Minister turned doctor in Africa.Open nobelprize.org (opens in a new tab)
Was this person a scientist?
Recorded Guesser outputRequired JSON format
{"result":{"action":"ASK","description":null,"name":null,"question":"Was this person a scientist?"}}Oracle evidence2 model-reported sources
The Oracle reported these excerpts and URLs. They are not independently checked.
Alsatian Theologian, Philosopher & PhysicianOpen britannica.com (opens in a new tab)
Physician, musician and philosopherOpen npg.org.uk (opens in a new tab)
Is this person from after the year 1800?
Recorded Guesser outputRequired JSON format
{"result":{"action":"ASK","description":null,"name":null,"question":"Is this person from after the year 1800?"}}Oracle evidence1 model-reported source
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)
Is this person best known for work in physics?
Recorded Guesser outputRequired JSON format
{"result":{"action":"ASK","description":null,"name":null,"question":"Is this person best known for work in physics?"}}Oracle evidence1 model-reported source
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)
Is this person best known for work in biology?
Recorded Guesser outputRequired JSON format
{"result":{"action":"ASK","description":null,"name":null,"question":"Is this person best known for work in biology?"}}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 this person best known for work in chemistry?
Recorded Guesser outputRequired JSON format
{"result":{"action":"ASK","description":null,"name":null,"question":"Is this person best known for work in chemistry?"}}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)
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)
Is this person best known for work in mathematics?
Recorded Guesser outputRequired JSON format
{"result":{"action":"ASK","description":null,"name":null,"question":"Is this person best known for work in 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 a physician, Protestant theologian, organist, and missionary, who was awarded the Nobel Peace Prize for 1952, primarily for his work at his hospital at Lambaréné.Open lbi.org (opens in a new tab)
Is this person best known for work in engineering?
Recorded Guesser outputRequired JSON format
{"result":{"action":"ASK","description":null,"name":null,"question":"Is this person best known for work in engineering?"}}Oracle evidence1 model-reported source
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)
Is this person best known for work in astronomy?
Recorded Guesser outputRequired JSON format
{"result":{"action":"ASK","description":null,"name":null,"question":"Is this person best known for work in astronomy?"}}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)
Role: Missionary surgeon; Founder of Lambaréné (République de Gabon)Open nobelprize.org (opens in a new tab)
Is this person best known for work in geology?
Recorded Guesser outputRequired JSON format
{"result":{"action":"ASK","description":null,"name":null,"question":"Is this person best known for work in geology?"}}Oracle evidence1 model-reported source
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)
Is this person best known for work in social sciences?
Recorded Guesser outputRequired JSON format
{"result":{"action":"ASK","description":null,"name":null,"question":"Is this person best known for work in social sciences?"}}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 this person best known for work in medicine or medical research?
Recorded Guesser outputRequired JSON format
{"result":{"action":"ASK","description":null,"name":null,"question":"Is this person best known for work in medicine or medical research?"}}Oracle evidence1 model-reported source
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)
Is this person from the 20th century?
Recorded Guesser outputRequired JSON format
{"result":{"action":"ASK","description":null,"name":null,"question":"Is this person from the 20th century?"}}Oracle evidence1 model-reported source
The Oracle reported these excerpts and URLs. They are not independently checked.
Albert Schweitzer — Born: 14 January 1875Open nobelprize.org (opens in a new tab)
Did this person develop a vaccine?
Recorded Guesser outputRequired JSON format
{"result":{"action":"ASK","description":null,"name":null,"question":"Did this person develop a vaccine?"}}Is this person primarily known for work in microbiology?
Recorded Guesser outputRequired JSON format
{"result":{"action":"ASK","description":null,"name":null,"question":"Is this person primarily known for work in microbiology?"}}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)
He was awarded the Nobel Peace Prize for 1952, primarily for his work at his hospital at Lambaréné.Open lbi.org (opens in a new tab)
Is this person American?
Recorded Guesser outputRequired JSON format
{"result":{"action":"ASK","description":null,"name":null,"question":"Is this person American?"}}Oracle evidence2 model-reported sources
The Oracle reported these excerpts and URLs. They are not independently checked.
Schweitzer considered himself French — and would formally take French citizenship after World War I.Open mayoclinicproceedings.org (opens in a new tab)
Albert Schweitzer ... was a German—and later French—theologian, organist, philosopher, physician, and medical missionary in Africa.Open openroadmedia.com (opens in a new tab)
Is this person known for discovering or developing an antibiotic?
Recorded Guesser outputRequired JSON format
{"result":{"action":"ASK","description":null,"name":null,"question":"Is this person known for discovering or developing an antibiotic?"}}Is this person European?
Recorded Guesser outputRequired JSON format
{"result":{"action":"ASK","description":null,"name":null,"question":"Is this person European?"}}Oracle evidence2 model-reported sources
The Oracle reported these excerpts and URLs. They are not independently checked.
Albert Schweitzer — Alsatian-German theologian and...Open britannica.com (opens in a new tab)
Albert Schweitzer is born ... in Upper-Alsace, Germany (now Haut-Rhin, France).Open history.com (opens in a new tab)
Is this person British?
Recorded Guesser outputRequired JSON format
{"result":{"action":"ASK","description":null,"name":null,"question":"Is this person British?"}}Oracle evidence1 model-reported source
The Oracle reported these excerpts and URLs. They are not independently checked.
Schweitzer ... would formally take French citizenship after World War I.Open mayoclinicproceedings.org (opens in a new tab)
Karl Landsteiner
Austrian physician and immunologist who discovered the major human blood groups
Validator rationale The proposal identifies Karl Landsteiner, while the trusted subject is Albert Schweitzer.
Recorded Guesser outputRequired JSON format
{"result":{"action":"GUESS","description":"Austrian physician and immunologist who discovered the major human blood groups","name":"Karl Landsteiner","question":null}}Is this person from Germany?
Recorded Guesser outputRequired JSON format
{"result":{"action":"ASK","description":null,"name":null,"question":"Is this person from Germany?"}}Oracle evidence1 model-reported source
The Oracle reported these excerpts and URLs. They are not independently checked.
Born: 14 January 1875, Kaysersberg, Germany (now France)Open nobelprize.org (opens in a new tab)
Is this person known for work in pharmacology?
Recorded Guesser outputRequired JSON format
{"result":{"action":"ASK","description":null,"name":null,"question":"Is this person known for work in pharmacology?"}}Werner Forssmann
German physician and Nobel laureate who developed cardiac catheterization
Validator rationale The trusted subject is Albert Schweitzer, while the proposal identifies Werner Forssmann, a different German physician and Nobel laureate.
Recorded Guesser outputRequired JSON format
{"result":{"action":"GUESS","description":"German physician and Nobel laureate who developed cardiac catheterization","name":"Werner Forssmann","question":null}}Is this person known for work on cellular respiration or metabolism?
Recorded Guesser outputRequired JSON format
{"result":{"action":"ASK","description":null,"name":null,"question":"Is this person known for work on cellular respiration or metabolism?"}}Oracle evidence2 model-reported sources
The Oracle reported these excerpts and URLs. They are not independently checked.
Doctor, Missionary, Philosopher and Musician.Open nobelprize.org (opens in a new tab)
Profession: Doctor of Philosophy, Theology and Medicine. Musician and missionary. Motivation: Albert Schweitzer was nominated for his humanitarian work on a religious basis.Open nobelprize.org (opens in a new tab)
Did this person win a Nobel Prize?
Recorded Guesser outputRequired JSON format
{"result":{"action":"ASK","description":null,"name":null,"question":"Did this person win a Nobel 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)
Is this person known for work in immunology?
Recorded Guesser outputRequired JSON format
{"result":{"action":"ASK","description":null,"name":null,"question":"Is this person known for work in immunology?"}}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)
Role: Missionary surgeon; Founder of Lambaréné (République de Gabon)Open nobelprize.org (opens in a new tab)
Otto Loewi
German pharmacologist and physiologist who discovered the chemical transmission of nerve impulses
Validator rationale The trusted subject is Albert Schweitzer, while the proposal identifies Otto Loewi, a different person.
Recorded Guesser outputRequired JSON format
{"result":{"action":"GUESS","description":"German pharmacologist and physiologist who discovered the chemical transmission of nerve impulses","name":"Otto Loewi","question":null}}Gerhard Domagk
German physician who discovered the antibacterial effects of Prontosil, the first sulfanilamide drug
Validator rationale The trusted subject is Albert Schweitzer, while the proposal identifies Gerhard Domagk, a different German physician and Nobel laureate.
Recorded Guesser outputRequired JSON format
{"result":{"action":"GUESS","description":"German physician who discovered the antibacterial effects of Prontosil, the first sulfanilamide drug","name":"Gerhard Domagk","question":null}}Albrecht Kossel
German physician and biochemist who discovered the nucleobases of nucleic acids
Validator rationale The proposal identifies Albrecht Kossel, a different person from Albert Schweitzer.
Recorded Guesser outputRequired JSON format
{"result":{"action":"GUESS","description":"German physician and biochemist who discovered the nucleobases of nucleic acids","name":"Albrecht Kossel","question":null}}Is this person's work related to hormones?
Recorded Guesser outputRequired JSON format
{"result":{"action":"ASK","description":null,"name":null,"question":"Is this person's work related to hormones?"}}Is this person known for work in cardiology?
Recorded Guesser outputRequired JSON format
{"result":{"action":"ASK","description":null,"name":null,"question":"Is this person known for work in cardiology?"}}Adolf Butenandt
German biochemist who isolated sex hormones and won the Nobel Prize in Chemistry for discoveries in biochemistry with major medical applications in endocrinology
Validator rationale The trusted subject is Albert Schweitzer, while the proposal identifies Adolf Butenandt, a different person.
Recorded Guesser outputRequired JSON format
{"result":{"action":"GUESS","description":"German biochemist who isolated sex hormones and won the Nobel Prize in Chemistry for discoveries in biochemistry with major medical applications in endocrinology","name":"Adolf Butenandt","question":null}}Adolf Windaus
German chemist and Nobel laureate who discovered the chemical structure of sterols and their relation to vitamins, with major medical applications
Validator rationale The trusted subject is Albert Schweitzer, while the proposal names Adolf Windaus, a different person.
Recorded Guesser outputRequired JSON format
{"result":{"action":"GUESS","description":"German chemist and Nobel laureate who discovered the chemical structure of sterols and their relation to vitamins, with major medical applications","name":"Adolf Windaus","question":null}}Heinrich Wieland
German chemist and Nobel laureate who discovered the structure of bile acids, with major medical implications
Validator rationale The proposal identifies Heinrich Wieland, while the trusted subject is Albert Schweitzer.
Recorded Guesser outputRequired JSON format
{"result":{"action":"GUESS","description":"German chemist and Nobel laureate who discovered the structure of bile acids, with major medical implications","name":"Heinrich Wieland","question":null}}Otto Warburg
German physiologist and medical doctor who discovered the role of oxygen in cellular respiration and won the Nobel Prize in Physiology or Medicine
Validator rationale The proposal identifies Otto Warburg, a different person from Albert Schweitzer.
Recorded Guesser outputRequired JSON format
{"result":{"action":"GUESS","description":"German physiologist and medical doctor who discovered the role of oxygen in cellular respiration and won the Nobel Prize in Physiology or Medicine","name":"Otto Warburg","question":null}}Emil von Behring
German physician and physiologist who won the first Nobel Prize in Physiology or Medicine for his work on serum therapy against diphtheria
Validator rationale The proposal identifies Emil von Behring, a different German physician, while the trusted subject is Albert Schweitzer.
Recorded Guesser outputRequired JSON format
{"result":{"action":"GUESS","description":"German physician and physiologist who won the first Nobel Prize in Physiology or Medicine for his work on serum therapy against diphtheria","name":"Emil von Behring","question":null}}Otto Fritz Meyerhof
German physiologist and biochemist, Nobel laureate in Physiology or Medicine for discoveries on glycogen metabolism and lactic acid in muscle
Validator rationale The proposal identifies Otto Fritz Meyerhof, whereas the trusted subject is Albert Schweitzer.
Recorded Guesser outputRequired JSON format
{"result":{"action":"GUESS","description":"German physiologist and biochemist, Nobel laureate in Physiology or Medicine for discoveries on glycogen metabolism and lactic acid in muscle","name":"Otto Fritz Meyerhof","question":null}}Feodor Lynen
German biochemist and 1964 Nobel laureate in Physiology or Medicine for discoveries on cholesterol and fatty acid metabolism
Validator rationale The trusted subject is Albert Schweitzer, while the proposal identifies Feodor Lynen, a different person.
Recorded Guesser outputRequired JSON format
{"result":{"action":"GUESS","description":"German biochemist and 1964 Nobel laureate in Physiology or Medicine for discoveries on cholesterol and fatty acid metabolism","name":"Feodor Lynen","question":null}}Paul Ehrlich
German physician and scientist, Nobel laureate known for work in immunology and chemotherapy, pioneer ofmagic bullet concept for medical treatment
Validator rationale The trusted subject is Albert Schweitzer, while the proposed identity is Paul Ehrlich, a different person.
Recorded Guesser outputRequired JSON format
{"result":{"action":"GUESS","description":"German physician and scientist, Nobel laureate known for work in immunology and chemotherapy, pioneer ofmagic bullet concept for medical treatment","name":"Paul Ehrlich","question":null}}Robert Koch
German physician and microbiologist who formulated germ theory and identified the bacteria causing tuberculosis, cholera, and anthrax
Validator rationale The proposal identifies Robert Koch, a different person from Albert Schweitzer.
Recorded Guesser outputRequired JSON format
{"result":{"action":"GUESS","description":"German physician and microbiologist who formulated germ theory and identified the bacteria causing tuberculosis, cholera, and anthrax","name":"Robert Koch","question":null}}Richard Kuhn
German biochemist who won the 1938 Nobel Prize in Chemistry for discoveries on vitamins and carotenoids, with major medical applications in nutrition
Validator rationale The proposal identifies Richard Kuhn, whereas the trusted subject is Albert Schweitzer.
Recorded Guesser outputRequired JSON format
{"result":{"action":"GUESS","description":"German biochemist who won the 1938 Nobel Prize in Chemistry for discoveries on vitamins and carotenoids, with major medical applications in nutrition","name":"Richard Kuhn","question":null}}Hans Spemann
German embryologist who discovered the organizer effect and won the 1935 Nobel Prize in Physiology or Medicine for his discoveries in developmental biology
Validator rationale The proposal identifies Hans Spemann, a German embryologist, whereas the trusted subject is Albert Schweitzer.
Recorded Guesser outputRequired JSON format
{"result":{"action":"GUESS","description":"German embryologist who discovered the organizer effect and won the 1935 Nobel Prize in Physiology or Medicine for his discoveries in developmental biology","name":"Hans Spemann","question":null}}Is this person best known for work in pathology or anatomy?
Recorded Guesser outputRequired JSON format
{"result":{"action":"ASK","description":null,"name":null,"question":"Is this person best known for work in pathology or anatomy?"}}Oracle evidence2 model-reported sources
The Oracle reported these excerpts and URLs. They are not independently checked.
Role: Missionary surgeon; Founder of Lambaréné. Prize motivation: “for his altruism, reverence for life.”Open nobelprize.org (opens in a new tab)
Dr. Schweitzer founded a hospital in Lambaréné and won the Nobel Peace Prize in 1952.Open pbs.org (opens in a new tab)
Wilhelm Conrad Röntgen
German physicist who discovered X-rays, whose work revolutionized medical imaging and diagnostics
Validator rationale The proposal identifies Wilhelm Conrad Röntgen, an X-ray-discovering physicist, not Albert Schweitzer.
Recorded Guesser outputRequired JSON format
{"result":{"action":"GUESS","description":"German physicist who discovered X-rays, whose work revolutionized medical imaging and diagnostics","name":"Wilhelm Conrad Röntgen","question":null}}Hans Krebs
German-born biochemist and Nobel laureate known for discovering the citric acid cycle (Krebs cycle), fundamental to cellular respiration and metabolism in medicine
Validator rationale The trusted subject is Albert Schweitzer, while the proposal identifies Hans Krebs, a different person.
Recorded Guesser outputRequired JSON format
{"result":{"action":"GUESS","description":"German-born biochemist and Nobel laureate known for discovering the citric acid cycle (Krebs cycle), fundamental to cellular respiration and metabolism in medicine","name":"Hans Krebs","question":null}}Konrad Bloch
German-American biochemist who won the 1964 Nobel Prize in Physiology or Medicine for discoveries on cholesterol and fatty acid metabolism, foundational to cardiovascular medicine
Validator rationale The proposal identifies Konrad Bloch, a different person from Albert Schweitzer.
Recorded Guesser outputRequired JSON format
{"result":{"action":"GUESS","description":"German-American biochemist who won the 1964 Nobel Prize in Physiology or Medicine for discoveries on cholesterol and fatty acid metabolism, foundational to cardiovascular medicine","name":"Konrad Bloch","question":null}}Albert Schweitzer
German-born physician, theologian, and medical missionary who won the Nobel Peace Prize for humanitarian medical work in Africa
Validator rationale The proposed identity names Albert Schweitzer and the description matches the trusted subject.
Recorded Guesser outputRequired JSON format
{"result":{"action":"GUESS","description":"German-born physician, theologian, and medical missionary who won the Nobel Peace Prize for humanitarian medical work in Africa","name":"Albert Schweitzer","question":null}}