水浒传第九回吴用的妙计妙在哪里？
《水浒传》第九回是＂柴进门招天下客 林冲棒打洪教头＂，讲的是林冲的故事，出场主要人物有林冲、柴进、洪教头，并无吴用。吴用是到十四回才第一次露面。所以，这一回吴用还没有出场，其妙计也就谈不上了。
请君入瓮的典故是什么？
请君入瓮
唐朝女皇武则天，为了镇压反对她的人，任用了一批酷吏。其中两个最为狠毒，一个叫周兴，一个叫来俊臣。他们利用诬陷、控告和惨无人道的刑法，杀害了许多正直的文武官吏和平民百姓。
有一回，一封告密信送到武则天手里，内容竟是告发周兴与人联络谋反。武则天大怒，责令来俊臣严查此事。来俊臣，心里直犯嘀咕，他想，周兴是个狡猾奸诈之徒，仅凭一封告密信，是无法让他说实话的；可万一查不出结果，太后怪罪下来，我来俊臣也担待不起呀。这可怎么办呢？苦苦思索半天，终于想出一条妙计。
他准备了一桌丰盛的酒席，把周兴请到自己家里。两个人你劝我喝，边喝边聊。酒过三巡，来俊臣叹口气说：“兄弟我平日办案，常遇到一些犯人死不认罪，不知老兄有何办法？”周兴得意地说：“这还不好办！”说着端起酒杯抿了一口。来俊臣立刻装出很恳切的样子说：“哦，请快快指教。”周兴阴笑着说：“你找一个大瓮，四周用炭火烤热，再让犯人进到瓮里，你找一个大瓮，四周用炭火烤热，再让犯人进到瓮里，你想想，还有什么犯人不招供呢？”来俊臣连连点头称是，随即命人抬来一口大瓮，按周兴说的那样，在四周点上炭火，然后回头对周兴说：“宫里有人密告你谋反，上边命我严查。对不起，现在就请老兄自己钻进瓮里吧。”周兴一听，手里的酒杯啪哒掉在地上，跟着又扑通一声跪倒在地，连连磕头说：“我有罪，我有罪，我招供。”
故事见于《资治通鉴·唐则天皇后天授二年》。成语“请君入瓮”，比喻用某人整治他自己。
Kindly Step into the Vat--Try What You Have Devised against Others
In order to suppress those who were against her, Wu Zetian, the empress of the Tang Dynasty (618-907), appointed a few merciless persons to be judges. Two of them were extremely brutal; one was called Zhou Xing and the other was called Lai Junchen. They killed many upright civil and military officials as well as ordinary people by framing up cases against tham and by administering inhuman corporal punishment to them.
Once, Wu Zetian received a letter which informed against Zhou Xing. The letter aside that Zhou Xing was plotting a rebellion in collaboration with others. Wu Zetian was furiously angry when she read the letter, and immediately ordered Lai Junchen to deal with the case severely. Hearing the order, Lai Junchen had misgivings about it. He knew that Zhou Xing could not be forced to tell the truth merely by using a letter informing against him because he was very sly and crafty. Lai Junchen also knew that he would not be for given if he should fail in dealing with the case, because the empress would certainly blame him and punish him. How could he solve the problem then? He turned the problem over and over in his mind, and finally thought out a "brilliant scheme".
Lai Junchen had a sumptuous feast prepared, and invited Zhou Xing to his home. The two of them urged each other to drink, and they talked while drinking. After the wine had gone round three times, Lai Junchen pretended to sigh, "When Ihandle cases in ordinary times, I often com across prisoners who stubbournly refuse to admit they are guilty. I wonder if you have any effetive measures." Hearing this, he took a sip of the wine. Lai Junchen immediately pretended to be very earnest, saying, "Oh, please do tell me at once." Smiling insidiously, Zhou Xing said, "Get a big vat, scorch it hot with charcoal fire all around, and then let the prisoner come into the vat. Will the prisoner fail to make a confession of his crime?" Hearing this. LaiJunchen nodded his head in approval repeatedly. He then ordered his subordinates to bring a big vat, and had a charcoal fire lit all around it as Zhou Xing had said. He then turned to Zhou Xing and said, "Someone in the imperial court has informed against you, saying that you are plotting a rebellion. The empress has ordered me to deal with the case severely. So I beg your pardon, but would you kindly step into the "Someone in the imperial court has informed against you, saying that you are plotting a rebellion. The empress has ordered me to deal with the case severely. So I beg your pardon, but would you kindly step into the vat?" Hearing this, Zhou Xing dropped his wine cup to the ground and the cup broke with a crash. Then he knelt down with a flop, nodded repeatedly and said, "I am guilty. I confess I am guilty."
This story appears in A General History as a Mirror of Past Events by Sima Guang of the Song Dynasty. From this story, people have derived the set phrase "kindly step into the vat -- try what you have devised against others".
请君入瓮阅读答案
1.请君入瓮：比喻以其人之道，还治其人之身。也是比喻某人用来整治别人的办法，来整治他自己。它揭露了酷吏的残忍，也教会人们一种以牙还牙的斗法；同时告诫人们不要作法自毙。（
比喻以其人之道，还治其人之身。 揭露了酷吏的残忍 ，也教会人们一种以牙还牙的斗法；同时告诫人们不要作法自毙。）
2.1.或：有人。 2.命：命令。太后：武则天。 3.方：正。 4.索：寻找。 5.鞫（jú）：审问，审讯。 6.瓮：大坛子。 7.推事对食：讨论事情，相对饮酒。 8.承：承认罪行。 9.炙：用火烤。 10.内状：宫内递出的状辞。 11.推：追究，检举。 12.当：应该，应当。 13.因：于是。 14.伏：承认。
3.天授中年，有人告这三人谋反，就找来俊臣来审理录口供。开始没有告诉兴他被控告了，他才和来俊臣吃饭。来俊臣说：“囚犯大多不服不招供，怎么办。”兴回答说：“很简单啊，把瓮放到中间，炽热的木炭围绕在边上，什么事情不招供呢？”来俊臣说：“很好。”命令人取来瓮，并点上火，然后告诉兴说：“有再人上书告你，请你尝试一下吧。”兴惊骇的汗流浃背，跪下叩头服罪。下诏诛杀了丘神绩而把兴发配到秦岭，在途中被仇人杀害。
<<请君入瓮>>讲了什么故事
原文
或告文昌右丞周兴与邱神勣通谋，太后命来俊臣鞫之。俊臣与兴方推事对食，谓兴曰：“囚多不承，当为何法？”兴曰：“此甚易耳！取大瓮，以炭四周炙之，令囚入中，何事不承?”俊臣乃索大瓮，火围如兴法。因起谓兴曰：“有内状推兄，请兄入此瓮！”兴惶恐，叩头伏罪。
译文
有人告密文昌右丞周兴和邱神勣串通谋反，太后（武则天）便命令来俊臣审这个案子。（一天）来俊臣请周兴到家里作客，他们一边议论一些案子，一边相对饮酒。来俊臣对周兴说：“有些囚犯再三审问都不肯承认（罪行），有什么办法使他们招供呢？”周兴说：“这很容易！（只要）拿一个瓮，用炭火在周围烧（这个瓮），然后让囚犯进入瓮里去，什么罪他敢不认？”来俊臣就（吩咐侍从）找来一个瓮，按照周兴的办法用炭在周围烧着，于是来俊臣站起来对周兴说：“有人告密你谋反，（太后命令我审问你）请老兄自己钻进这个瓮里去吧！”周兴非常惊慌，当即磕头承认罪行.