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One Arbitrary Group We have riddles, trivia, puzzles and other games. New problem comes out every weekend. Get solving now, and start enjoying those brownie points

• Problem of the week: (2019/2/16)

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  Some sum puzzle

  
  A teacher is testing his best students Albert, Bernard and Cheryl with a little game. He glued a piece of paper with a number written on it on each of their foreheads and told them that one of their numbers is the sum of the other two numbers, and that each of the numbers are between 1 and 5. The students can’t see their own foreheads, but they can see each other.

  After the explanation the teacher asks Albert if he knows what number he has, to which Albert responds “No sir, but I know that Bernard also doesn’t know it”. The teacher then turns to Cheryl and asks whether she has the largest number or not. Cheryl, smart as she is, thought for a few seconds and declared “I didn’t know it before Albert answered your question, but I do know it now whether I’m the largest or not!” and then she proceeded to write the answer on a piece of paper which she showed only to the teacher.

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  What did Cheryl write on the piece of paper?

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  Bonus round:

  
  During lunch break Diana, friend of Bernard’s, told him that she’d been eavesdropping the conversation, but that there was something still bugging her. "What was going on?" she asked. "Well," Bernard responded, "if you had lined us up in alphabetic order, you could have moved one of us towards the front of the line and get the numbers in ascending order". Somehow, Diana was satisfied with this answer.

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  What were the numbers on their foreheads?

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OGS Title Tournaments Seasonal correspondence tournaments with a long standing tradition. They often host hundreds of players at a time. Be sure to check them out.

• History:

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  From the group description:

  There have been six title tournaments on OGS since the year of 2007, named (by popular choice) after five of the main oriental titles and one computer scientist. Two of the titles are named after Chinese tournaments Mingren and Tianyuan; two of the titles are named after Japanese tournaments Honinbo and Meijin; one title is named after Korean tournament Kuksu; one title is named after the famous computer scientist Alan Turing, in which bots and computer assisted players are allowed

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Grupo de la Asociación Deportiva de Go de Costa Rica Asociación afiliada a la Federación Internacional de Go (IGF) Son bienvenidos jugadores de todos los niveles

• Reuniones Semanales:

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  Todos los sábados (excepto eventos especiales) de 1 p.m. a 4 p.m. en el Instituto Confucio de la UCR de San Pedro.

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