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Hot day
Today, the highest temperature measured at Twenthe weather
station was 29.4 degrees Celsius with the humidity around
45 degrees. This is the result of a persistent high presure
system which is sending us warm air from central Europe.
In the evening, it was still around 24 degrees Celsius.
The past May has been the hottest
in hundred years with an average temperature of 15.7 degrees
Celsius whereas 12.7 degrees is normal.
New fences
Today, a new fences were installed on both sides
of our back garden. Two of
the three chestnut trees
were extremely pruned by the workmen. I already had
expected that this would happen as these trees were
very close to the fence and the space was rather
narrow.
This evening, Annabel and
I went to the university to play Go.
When we arrived, Taco and Araldo had just decided to
play a game. Annabel and I decided to play. First she
wanted to play on a 13x13 board, but I convinced her to
play on our 19x19 board. The first game she was given
5 stones ahead and she won with 50 points. The second
game she was given three stones ahead, and I resigned
quite soon, because I was messing up thing pretty well.
For the last game she was given only two stones ahead.
I won this game with 17 point and only because I managed
to kill a group of her, otherwise she would have clearly
won. (Annabel snapped
some pictures when I cleaned up the stones.)
In the mean time, Rudi and Huub had arrived as well.
Rudi watched the game between Taco and Araldo and Huub
watched us playing.
1-3-4 mazes
1-3-4 mazes are square mazes where each room has
either one, three, or four exists. There is thus
no room with two exits. With the building blocks
shown on the right it is possible to construct
these kinds of mazes where both sides are a multiple
of four. You just take an arbitrary maze, with
rooms with any number of exists and replace each
room with one of the building blocks, rotated or
mirrored if needed.
When I was in highschool, I already developed a
similar proof for multiples of five.
(follow-up)
Italy defeated
This evening, Annabel,
Li-Xia, and I watched
the soccer game between the Italian and the Dutch
soccer teams as part of the European Championships.
The Dutch team plays very strong and are in control
of the game. The make two goals in the first half of
the game. In the second half it seems as if the
Italian team is fighting back, and
Edwin van de Sar
has to stop some goals, but the Dutch team makes
another goal. The Dutch have defeated the current
world soccer championship Italy, who have never
before lost a game with such a score during any
previous European Championship game.
(follow-up)
5 by 5 1-3-4 mazes
I wrote a program
to calculate all the 5 by 5 1-3-4 mazes.
This program produces this output in which there are 386 different solution,
not taking in account symmetries. Some of the solutions
are internally equivalent and only differ with respect
to external exits. With respect to the external exits
there are six different types: crossing (with four
exits), T-shape (with three exits), straight (with two
exits), L-shape (with two exits), dead-end (with one exit),
and none (with no exits). There are 257 internally
equivalent shapes. The distribution is according the
following table. The capitals in the first column
refer to the different types. If a capital occurs
twice, it means that there are two different possibilities
to place the exits according to the type.
| # | crossing | T-shape | straight | L-shape | dead-end | none | totals |
| C | 25 | 25 | | | | | | 25 |
| CT | 32 | 32 | 32 | | | | | 64 |
| T | 55 | | 55 | | | | | 55 |
| TS | 6 | | 6 | 6 | | | | 6 |
| TL | 19 | | 19 | | 19 | | | 38 |
| TLLD | 6 | | 6 | | 12 | 6 | | 24 |
| TSLD | 6 | | 6 | 6 | 6 | 6 | | 24 |
| S | 14 | | | 14 | | | | 14 |
| SD | 7 | | | 7 | | 7 | | 14 |
| L | 38 | | | | 38 | | | 38 |
| LD | 19 | | | | 19 | 19 | | 38 |
| LDDN | 2 | | | | 2 | 4 | 2 | 8 |
| D | 21 | | | | | 21 | | 21 |
| DN | 4 | | | | | 4 | 4 | 8 |
| N | 3 | | | | | | 3 | 3 |
| totals | 257 | 57 | 124 | 33 | 76 | 67 | 9 | 386 |
(The 'totals' column does not include the count of the '#' column.)
This evening, Annabel
and I followed the soccer match between France
and the Netherlands. Early in the game, the
Dutch team scored their first goal, but then
they did not play as strong as in their
match against Italy last Monday.
But in the second half they started to play
stronger and the defeated France, who won the
second place in the 2006 World Championships,
with the score of 4-1. This means that the
Netherlands is the winner of Group C of
UEFA Euro 2008, no mather what will
be the outcome of the last match against
Romania. They don't plan on letting Romania
win, which would kick both Italy and France
out of the tournament, because they want to
win every game.
(follow-up)
Outcome of group C
This evening the two final games of group C of
UEFA Euro 2008 were played. These were between
the Netherlands and Romania, and between Italy and
France. The Dutch already had qualified for the
quarter-finals. Which other country would qualify
depended on the following rules (as found on the
wikipedia page of this afternoon):
- Romania would advance if:
- they beat the Netherlands,
- or they lose to the Netherlands by a margin of
3 goals or less, but not 0-3, while Italy and
France play a 0-0 draw.
- Italy would advance if:
- they beat France, while Romania fail to beat
the Netherlands,
- or they play a 1-1 or higher draw with France,
while Romania loses to the Netherlands,
- or they play a 0-0 draw with France, while
Romania lose to the Netherlands by a 0-3 scoreline
or by more than three goals.
- France would advance if:
- they beat Italy, while Romania fail to beat the
Netherlands.
Or in a more algorithmic way:
if Romania > Netherlands
then Romania qualifies
elif France > Italy
then France qualifies
elif Italy = 0 and France = 0
and Netherlands - Romania < 4
and not (Netherlands = 3 and Romania = 0) and
then Romania qualifies
else Italy qualifies
fi
Or to make life easier, just fill in the score:
During the evening, it was Italy who scored first, which
caused them to qualify. As long as no goals were made,
Romania was going to qualified. In the end both Italy and
the Netherlands won with 2-0, and there was no single
moment in which Italy lost their qualification.
(follow-up)
Playing Go
This evening, Li-Xia and I
biked to the university. We arrived there around twenty
past eight. When it was about a quarter to nine, we
agreed that I would order some tea and that we would
go home, when I had finished it. (Li-Xia did not want
do drink something.) Just five minutes later Taco
arrived and we started a game of
Go where I got seven stones ahead. Not much later
Rudi and Huub also arrived and the started to follow
our game. When Huub took a picture, I decided to follow
his example, so that I could recall the moves alter on.
(Last picture)
As usual, I lost some points in the end game, and the
final outcome was 63 to 62 in favour of Taco. Not much
later, Li-Xia and I took a very relaxed bike trip home.
At home I started to reconstruct the game using the
pictures. That worked quite well, except for some parts
where I had be messing around a bit. The results can be
seen in this PostScript file
(PostScript to PDF
converter) and this SGF file.
The Netherlands defeated by Hiddink
This evening, on the longest day of the year, the
Dutch soccer team was defeated by the Russian
national team coached by the Dutch
Guus Hiddink. Everybody agrees that the victory
of Russia was well deserved, because the Russian
team was simply playing much better. It was also
clear that the magic that caused the Dutch team
to defeat both Italy and
France before, had totally
gone. Only after they were one point behind, it
returned a little. Some are saying that the magic
was lost because Van Basten started with a very
different selection in the game against
Romania. Others blame
Rafael van der Vaart for wanting to control
the game too much. There were more than 100,000
Dutch fans in Basel were the game was played.
Now all the orange decorations in the streets can
be removed again.
Thunderstorm
Just a little before three o'clock, one could
hear an almost continues rumbing sound outside.
The sky was not that dark at all. To the East
you could even see some small patches of blue
sky, but on the West the sky was much darker.
Faint flashes could be seen. Short after three
o'clock it started to rain very heavy. About
20 minutes later it was over, but the alley
behind our house was flooded with about 5 cm
(2 inches) of water. When I checked
www.buienradar.nl,
it became clear that this was a very big thunderstorm
(rainfall and
with thunder).
Later on, I heard that hailstones the size of
ping-pong balls had caused heavy damage in
some areas covered by this thunderstorm. In
some places the strong winds caused by the
thunderstorm have uprooted many trees.
Jordania
Some organisation called The Messenger of Allah Unites Us
in Jordania is thinking about starting a court case against the
Dutch politician Geert Wilders,
because of his film called Fitna.
This could imply that a Jordanian court might issue an international
warrant for him. The Netherlands does not have
an criminal exchange treaty with Jordania, so
there is no change that they will request his
extradition.
These days there was also news that two Dutch companies,
Friesland Foods and Zwanenberg Food Group, have publish a large
advertisment in some Jordanian newspapers to ward
of a boycot of there products. In this advertisement
they state that they do not agree with the contents
of the Fitna film and that they support
The Messenger of Allah Unites Us in there
quest for international laws against insulting
religions. The brands of these companies are:
Zwan, Zwanenberg, Linera, Kips, Limco, Hooymans,
Offerman, Huls, Appelsientje, Bonnet Rouge,
Chocomel, Completa, Coolbest, Debic, Domo,
Dots, DubbelFriss, Dutch Lady, Extran, Foremost,
Frico, Friesche Vlag, Frisian Flag, Friso, Fristi,
Kievit, Milli, Noy Noy, Peak, PöttyUos, and Rainbow.
If you support the freedom of speech, you might want
to avoid these products.
Playing Go
This evening, I went to the university to
play Go. I arrived at the
same time as Taco, but because we play against
each other we decided to wait. Not much later
Rudi arrived, and he and Taco started a game.
After about ten moves, Araldo arrived, and we
decided to play with me given five stones ahead.
I was doing quite well until at the end of the
game I missed a trick move and lost a lot of
stones. First I wanted to resign, but then we
decided to continue, just to see how much I
had been ahead. I lost with 37 against 48 points.
We concluded that I was at least ten points ahead
before I fell for his trick move.
This months interesting links
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Sunday, June 8, 2008