I'm just a unisexual dog of no breed, disguised as a Homo sapiens in front of computer.
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In the diagram (click to see the full image), try to determine the value of the 2 red squares. Which is 5, and which is 9? Try your best to do it in mind, without the aid of any sudoku program or pen (including pencil or whatever). Only use other tools if you give up. Once the 2 aforementioned squares are determined, the rest will be as easy as a pie.
If you can visually determine which square can be revealed next, you have the potential to solve some of the most difficult ones. I’ll give answer later.
2006-07-03 edit: The answer is a 8, shown inside a red circle in the right diagram. The key point is to notice that, the possibilities of 8’s in middle left and bottom left 3×3 squares are limited. Why? This is left as an exercise.
早些時候我在網上找一些華容道遊戲的源頭的資料，也親自看到了中國人的研究精神發揮得如何淋漓盡致。華容道遊戲是中國人發明的，為甚麼呢？
將上面所有句子串起來，然後將所有可能字樣全部刪除，便得到結論了：
現在網上看到的文章，這個結論佔至少九成。
另外一成，則認為起源不在中國：
是比較科學一點了，不過可笑的地方也不遑多讓：
不過，就我所知他是個中國數學教育家，而且是中學教師啊。 [5]（他寫的另一本《趣味的數和圖》，好像現在還在家中）
因為以上的東西，中國人的文化永遠絕對是全世界第一的。因為中國文化遺產是最多的，所以中國人就是最優越的。
從不同的書本、媒體中，從老師的教導中，我們自小就灌輸了這種思想，中國人是最棒的，因為甚麼都是中國人最早發明的。至少我自己遇到的中文書籍如是，歷史教科書如是，報紙文章如是。這方面就不需要詳細再說下去，因為別人已經寫得清清楚楚 (這篇文章就是一個例子)，而且文筆尖銳得多。大家就看看甚麼是中國古代四大發明。只是這類文章必定不會受某類人喜歡吧，因為它污蔑中國文化歷史，破壞中國人的自尊。
但是說中國人目前這一分這一秒如何如何不濟，如何需要自強，卻是寥如晨星。這就是「隱惡揚善」，是中國人自古以來的美德吧？
如果不幸有朝一日我變成柏楊的話，請大家槍斃我，不要把我關進牢內。
04:29 更新：以下是我對於上面「四大發明」的文章，覺得最容易觸動心境的一段說話：
有的时候我会想，咱们中国人怎么就那么在意我们以前是不是第一，不惜撒谎吹牛都要去维护这个第一，却不关心我们现在是不是第一，这是不是一种病态的心理呢？就像一个人，如果生活事业顺利，就很少去回忆过去的事情，也没有时间去回忆。只有失败者，对前途绝望者，对生活失去信心者，才老怀念过去，靠这个来安慰自己。或者是像人老了就喜欢怀念过去，年轻的就喜欢幻想未来。现在中国的复古风气很盛，可能我们中国人真的是觉得已经快走到穷途末路了吧。
Since tom.com days, I have always wondered how Leon managed to get all of the IP ranges assigned to Hong Kong. Certainly, the utter crap HKDNR won’t provide this kind of listing. The mystery is keeping me puzzled for all these years.
Finally, I just get it today after searching through APNIC. Basically it’s just one command (wrapped because it’s too long):
wget -q -O - http://ftp.apnic.net/stats/apnic/delegated-apnic-latest | grep '^apnic|HK|ipv4' | awk -F\| 'BEGIN{OFMT="%d"; for (i=0; i<32; i++) {power[32-i]=2^i}} {for (k in power) {if ($5 == power[k]) print $4 “/” k}}’
To retrieve IPv4 address allocation for other districts, use capitalized ISO 3166 code of that district to replace ‘HK’. For example, ‘CN’ for China and ‘TW’ for Taiwan.
2006-06-07 03:41 update: Alan Tam made a good suggestion to make it simpler. Please read the comment.
Unquestionably, the answer is, captcha is absolutely against accessibility. (For those who don’t know what Captcha is, please take a look at the explanation in wikipedia) Captcha is exchanging website accessibility for security, that’s sure.
However, when I knew that Wordpress Captcha plugin is discontinued a few days ago, citing accessibility problem for people with vision problem (e.g. blindness or color blindness), I have a question: is Captcha plugin so bad for these people?
As far as I know, still quite a large portion of blind people are going online with DOS + Lynx, and lynx doesn’t support javascript. Most wordpress sites are already inaccessible for them anyway, captcha shouldn’t make any difference for them. The author of captcha plugin is migrating to wp-hashcash; however, how another chunk of javascript can help in accessibility? Do we really understand the need of the minority, or we just imagine we understand them?
(One point is true though, badly designed captcha affects usability, even for people with normal vision.)
16:30 update: I’m using wp-hashcash to replace captcha as well, but won’t pretend this improves accessibility for the site.
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