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Diary, October 2012

Sun Mon Tue Wed Thu Fri Sat
      1   2   3   4   5   6
  7   8   9  10  11  12  13
 14  15  16  17  18  19  20
 21  22  23  24  25  26  27
 28  29  30  31

Tuesday, October 2, 2012

Palindrome date

Today is a palindrome date when written according to the (D)D-(M)M-(YYY)Y format: 2-10-2012. The previous such date was October 1, 2011 and the next will be October 3, 2013.

Tuesday, October 16, 2012

Defeated during challenge

This morning, Christian Freeling resigned when playing against the program Lajkonik during the Havannah Challenge 2012 and thus lost his € 1000 of the bet that he made that no program could defeat him in a match of ten games. It was the third game he played against Lajkonik during the challenge where the second game was declared invalid by the arbriter when it was terminated due to a communication error. Game record with some comments (on Google+).

Friday, October 19, 2012

7 - 3

Today, Christian Freeling lost both games of the challenge, bringing the final score to three lost games from the ten games of the Havannah Challenge 2012. In the morning, he lost again from the program Lajkonik during against which he played a total of four games. Game record with comments and many variants (on Google+). In the afternoon, he lost from the program Castro. Game record with comments and variants. Castro showed his strongest play in this game. From the analyses of the game by Ton (one of the top Havannah players), I understand that it is difficult to pinpoint the losing move of Christian. Ton remarks that Christian played too defensive at the start of the game. Both Castro and Lajkonik have become much stronger in the last half year. The 1000 Euro will be divided amongst the winning programs. Maybe in another five years, programs will beat humans consistently.

Saturday, October 20, 2012


At 13:14, I bought the book 36 Zichten op de Alphatoren by Diana Huijts (ISBN:9789087520007) for € 29.99 from bookshop Broekhuis. The book contains 36 linocuts which have been coloured, which all contain (sometimes very small) some part of the highest building in Enschede, known as the Alpha tower. When I saw an exposition on September 22 in the bookshop, I thought it would be a nice idea to make a book with those print. Later, I discovered that the reason for this exposition was the presentation of the book.

Thursday, October 25, 2012

Date in base-31

In the documentary Matthew's laws it shows how Matthew is counting the days of his life using a base-36 number using the digits and the capital letters of the alphabet. His motivation for doing this, is that he only needs three characters to represent each day in his life. Because 0 and O look so similar, I would exclude the O from the alphabet. Which would result in base-35. But why only remove the O and not the other vowels? That would result in a base-31 number. 31 is prime. If you use the digits and the consonants, then today, it will be day MCP of my life when November 1, 1961 was day 0.

Friday, October 26, 2012

Circumzenithal arc

This afternoon, I saw a reflection of a rainbow in the rear windshield of my car. Looking up into the sky I noticed the bow almost straight up in the air. I realized that this could not be a rainbow. At home, I concluded that it must have been Circumzenithal arc. Here on the right a part of one of the pictures that I took.

Saturday, October 27, 2012

Gerard Reve, Part 3

At 12:00:40, I bought the book Gerard Reve, Kroniek van een schuldig leven. Deel 3 - De late jaren (1975-2006) by Nop Maas from bookshop Broekhuis for € 35.00. This is the third volume of the biography of the Dutch author Gerard Reve. The publication of this books as been delayed by several court cases, because the last partner of Reve did not agree with the content of this biography.

Sunday, October 28, 2012

My Brain is Open

I finished reading the book My Brain is Open: The Mathematical Journeys of Paul Erdös by Bruce Schechter, which I started reading on October 20. I really enjoyed reading this book about Paul Erdös, which I bought on January 22, 2011. It has a good balance between mathematics and biography. The mathematics is dealt with at not a too easy but not also too difficult level.

This months interesting links

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