below the Unicode Consortium page about it. Not much said about it, apart that it's "square log" (and not captain log ; although it would have been cool)…
UNICODE v7 http://www.unicode.org/charts/PDF/U3300.pdf
UNICODE v4 http://www.unicode.org/charts/PDF/Unicode-4.0/U40-3300.pdf
(No difference whatsoever.)
Also said, it's an unified Han ideograph & info can be found in the db. Strangely I never saw any maths stuff inside the unihan db when I unpacked it few month ago…
// http://xahlee.info/math/blog.html //
The ancient game of go still holds many challenges. Compared to go, chess is like tac-tac-toe. There are 255168 possible games of tic-tac-toe. There are about 10^120 possible chess games. But there are about 10^761 possible go games!
The main challenge with go is playing it well. But there's also counting the number of legal positions.
A full-fledged go board has 19 × 19 squares, and approximately this many legal positions:
That's about 2 × 10^170.
John Tromp wants to know the exact number. Why? Because it's a fun challenge. He knows an algorithm to calculate this number. It's very clever. But it still takes a lot of computing power.
He recently calculated the number of legal moves on an 18 × 18 board. It took 9 months of computation and 4 petabytes of disk IO on a Dell PowerEdge R820 server. He did it at the Institute for Advanced Studies in Princeton... that place where Einstein used to hang out. The answer is:
To get the answer for a 19 × 19 board will take more work. Using some very clever math, the task can be split up into 9 jobs that each compute 64 bits of the 566-bit result. To do this and be sure the answer is right, he needs about 10 to 13 servers, each with at least 8 cores, 512GB RAM, and 10-15 terabytes of disk space. The job will take about 5-9 months.
If you want to help out, email him at email@example.com.
You can read more about this here:
including the answers for all square boards of size up to 18 × 18. The most interesting part is the algorithm to compute these numbers:
Puzzle 1: Can you turn this animated gif into a looped animated gif? It's from Wikicommons. It's sad that it plays just once and then stops:
Puzzle 2: This animated gif is just 11 kilobytes. We could easily afford a looped gif that plays a whole game - say, a famous game. Wikicommons deserves it! Can you make one?
I thank for pointing out Tromp's work. A calculation of the number of tic-tac-toe games is here:
There seems to be some controversy here: another person computed the number of games counting to as the same if they're related by symmetries, and got an answer of 26830. Because this is less than 1/8 times the answer above, they can't both be right.
Ever since I got a smart phone in September, I've been playing go with a program called "Go Free". Someday soon I'll fork over the $1.99 to get the version that lets you play on a 19 × 19 board. So far I'm just trying to learn to crush the computer on a 13 × 13 board. I like playing a computer because I get annoyed at human opponents when they beat me, and I don't like that. At some point I should be able to beat the computer consistently on a 19 × 19 board and then I'll have to either quit or... something else.
Go is full of general lessons about life, which become more profound as you get better... at least for a while. Maybe at some point it devolves into being "merely technical" - I don't know.
Unfortunately these general lessons mostly apply to situations where cooperation is not an option. So it's possible my personality is being warped by playing go. Sometimes I can sort of feel that happening.
2.2.0 :017 > a = <<␄
SyntaxError: foo.rb:17: can't find string "␄" anywhere before EOF
foo.rb:17: syntax error, unexpected end-of-input, expecting tSTRING_CONTENT or tSTRING_DBEG or tSTRING_DVAR or tSTRING_END
from /usr/bin/irb:12:in `<main>'
a = <<␄
Although with "a = <<-␄" it works…
I may be dumb not being able to find something about dochere in ruby but it's weird that a unicode char is working in some case and not on the other… ಠ_ಠ
Pour ceux qui comme moi on tendances
à abuser du Posca, on se rend vite à l'évidence, on en use beaucoup et
de fait ça revient relativement cher. En effet le réservoir des Posca
s'épuise plutôt rapidement. Il existe une solution facile à mettre en œuvre ...
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