(As shown in the picture) When one side hangs the other side's star position in F3, the other side should not take the lead, and one side will continue to unload the goods at C6 of the other side's star position and attack it. Chess is named because it looks like a flying swallow with wings spread.

The formula of leaning cover is often used to deal with the attack of "two flying swallows", and there are also ways to deal with the small tip of the fifth (E5 position in the figure). Zhou Lan was a famous Weiqi player in the early Qing Dynasty in China. His characteristic was to take the initiative everywhere. His original method was to rely on the cover to deal with the two swallows. The most famous one is that he has a volume of Go manual. Someone once wrote a poem for it on the Internet.

Light and delicate, it is better to lose a few children than to lose them first.

Every time you lean on a pair of swallows, you visit a superior person humbly.

2. Well-known domestic peripheral brands

Shuangfeiyan, a well-known domestic peripheral brand, has cooperated fully with A4TECH of Taiwan Province Province since the birth of 1987, conducted production inspection in full accordance with international quality control standards, established a complete production and quality management system, and passed the German TUV certification of ISO900 1 system.

The main products are mouse, keyboard, camera, speaker, chassis, headphones and so on.

Shuangfeiyan has always been committed to technological innovation, product innovation and production innovation, and has always unswervingly taken the road of professional development and constantly brought forth new ideas. From the famous 2D mechanical mouse era to today's "X series engine" era, Shuangfeiyan has always led the development of the industry, not only creating the indestructible first brand in the eyes of Chinese people, but also creating the reputation of "the king of awards". X7' s passion, R7' s ultra-low power consumption, laser GLASER's non-selective desktop and so on are far ahead of the forefront of science and technology. It has nearly 100 patented technologies, good word-of-mouth effect and mass base.

For a long time, Shuangfeiyan has always been committed to technological innovation, product innovation and production innovation, unswervingly taking the road of professional development and constantly bringing forth the new. From the famous 2D mechanical mouse era to today's "X series engine" era, Shuangfeiyan has always led the development of the industry, not only creating the indestructible first brand in the eyes of Chinese people, but also creating the reputation of "the king of awards". X7' s passion, R7' s ultra-low power consumption, laser GLASER's non-selective desktop and so on are far ahead of the forefront of science and technology. All this comes from the concerted efforts and all-out efforts of Qi Xin of Shuangfeiyan people, but also depends on the strong scientific research ability of Shuangfeiyan. Nearly 100 patented technologies ensure the sustained take-off of Shuangfeiyan, and good word-of-mouth effect and mass base are the source power for Shuangfeiyan to keep advancing and surpassing itself.

Guided by the core values of "innovative technology, professional quality, seamless service, genuine goods and highest honor", Shuangfeiyan has always unswervingly implemented the concept of "rather losing money, not making inferior products and not making fakes", and put "nationwide warranty maintenance for end users" into concrete actions, constantly improving the level of channel construction and after-sales service, and serving at a loss. Handle the maintenance within or outside the warranty in time, and handle reasonable or unreasonable complaints in time. I would rather lose myself, and I will never let the users who love Shuangfeiyan complain at all, so that users can enjoy consumption and service happily.

Shanghai shuangfeiyan cleaning equipment co., ltd

Founded in 1997, the company has not only obtained a complete set of mechanical processing equipment, but also accumulated rich experience in mechanical design, processing and assembly, trained a large number of dedicated technicians and, more importantly, established an effective, scientific and strict quality management system in the long-term cooperation with internationally renowned enterprises such as Shanghai Weimont Special-shaped Steel Pipe Co., Ltd., Shanghai adil Precision Casting Co., Ltd. and Japanese Matsushita Electric Co., Ltd. And passed the ISO900 1 certification on 200 1, which made our company gain the reputation of respecting contracts and stressing credibility among customers.

In order to achieve greater development of enterprises, after more than two years of market research, it is found that with the rapid development of China's automobile industry, more and more small cars will enter the homes of ordinary people. The demand for the beauty and cleanliness of cars is bound to increase. Manual car washing with only one bucket and two rags can't keep up with the situation. And with the development of the city, green, clean and tidy do not allow manual car washing. In particular, car owners have higher and higher requirements for car washing, which in turn limits the development of manual car washing. Therefore, it will be inevitable to develop safe, energy-saving, fast and automatic car washing equipment. Therefore, our company has recruited a group of people who are interested in car washing machine industry in China, aimed at the advanced level of the world, absorbed the advanced concepts of car washing equipment from all over the world, and developed a number of computer automatic car washing machines with independent intellectual property rights in combination with the current actual situation in China. At present, the company's car washing machines have been exported at home and abroad (Syria, xinjiang, Harbin, Beijing, Shanghai, Zhangjiagang, Wuxi, Taiyuan, Harbin, Guizhou, Yunnan, Guangxi, Hengyang, Yongzhou, Loudi, Changsha, Jiangxi, Henan, Tangshan, Cangzhou, Xi 'an, Hanzhong, Guangzhou, Shenzhen, Zhongshan, Huizhou, Jiangmen and Shaoguan). In terms of modeling, function and product quality, it has been well received by customers, and established a branch in Guangzhou in July 2005. Now it has become one of the most powerful enterprises specializing in the production of car washing machines in China.