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官子一词，源自于明代末年著名国手过百龄的《官子谱》，包括了死活、手筋、官子，直到清嘉庆年间卞立言编撰《弈萃官子》时，才开始比较明确地界定了官子一词的含义。
官子只有三种类型: 1. 双方后手: 无论哪方下都是后手; 2. 双方先手:无论哪方下都是先手; 3.单方先手:一方下是先手，另一方下是后手，又叫作逆先手。
收官原则: 1. 双方先手，势在必争是不变的原则; 2. 单方先手（逆先手）时机把握要准确; 3. 双方后手, 从大至小依次收取。
官子的计算方法:
1. 出入计算法：设想双方先走的局面，然后比较双方空的出入，双方出入相加的目数就是这个官子的价值。出入计算法的基础是单方目数增减的计算，目数的得失和棋子的取舍都是根据这种方法来计算的。
2. 折半计算法：折半计算法根据官子的后继手段及其目数增减来计算。有些官子，除了它本身所得之外，还有后继手段可以进一步再获利益，即第二利益。由于双方获得第二利益（后手）的机会均等，因此，这个权利为双方各占一半，故采取折半计算法。
3. 加倍计算法：加倍计算法是相对于逆官子而言的。逆官子，就是对方本来是先手的没走，你后手走了，就是逆官子。逆官子虽然也是后手官子，但它防止了对方的先手，价值比普通的后手官子更大， 一般可以简单看成本身的价值×2。
本软件官子题目内容包括：
＊ 一手棋的价值，列出了覆盖30目以下的官子的各种题型，共488道题
＊ 精妙收官, 收集了实战中经常出现的许多棋型，告诉你如何收官，共110道题
＊ 官子谱，古代官子题集大成者，共201道题
本软件的特点：
一、你下一步棋后，电脑自动跟着下出最佳应对的着法。
二、可以直接看答案，所有的正解图和失败图都一一列出。
三、有正解图的提示，可按照提示一步一步做，多个正解图可重复出现。
四、正解图可自动演示，多个正解图可循环播放。
五、研究模式可以让你研究其它变化图。
六、可以通过邮件发送棋谱。
* 100% 纯软件
围棋官子大全是完全的绿色软件，本地运行无任何联网，无任何安装插件。
反馈:
如果您有好的意见或建议，请发送邮件: 459788263@qq.com","app_summary":"The app was last updated on 17 October 2016. Released in China on 01 July 2013 and globally on 01 July 2013. 围棋官子大全 belongs to the 'Reference' category maintaining a content rating of '4+'. In China, 围棋官子大全 ranked 476th on the 'Top Free iPad Apps' chart in the 'Reference' category. Last month's estimates were < 5k downloads and < $5k revenue. The app is available in China, Taiwan, and Thailand but not being advertised actively. Sign up / Sign in to learn more about the time spent, session durations, usage & engagement (DAU, WAU, MAU), retention, churn, marketshare, growth trends, and other market statistics.","subtitle":"","promo_text":""},"has_in_app_purchases":true,"installs":null,"language":"ZH-CN","support_url":"http://www.zokapp.com","top_countries":["CN","TW","TH"],"valid_countries":["AE","AO","AR","AT","AU","AZ","BE","BF","BG","BH","BJ","BO","BR","BY","CA","CG","CH","CI","CL","CM","CN","CO","CR","CY","CZ","DE","DK","DO","DZ","EC","EE","EG","ES","FI","FR","GB","GE","GH","GR","GT","HK","HR","HU","ID","IE","IL","IN","IQ","IT","JO","JP","KE","KH","KR","KW","KZ","LA","LB","LK","LT","LU","LV","LY","MA","ML","MM","MO","MT","MX","MY","MZ","NG","NI","NL","NO","NZ","OM","PA","PE","PH","PK","PL","PT","PY","QA","RO","RS","RU","SA","SE","SG","SI","SK","SN","SV","TH","TN","TR","TW","TZ","UA","UG","US","UY","UZ","VE","VN","YE","ZA","ZM","ZW"],"available_countries":["US","AU","CA","CN","FR","DE","GB","IT","JP","KR","RU","DZ","AO","AR","AT","AZ","BB","BY","BE","BM","BR","BG","CL","CO","CR","HR","CZ","DK","DO","EC","EG","SV","FI","GH","GR","GT","HK","HU","IN","ID","IE","IL","KZ","KE","KW","LB","LT","LU","MO","MG","MY","MX","NL","NZ","NG","NO","OM","PK","PA","PE","PH","PL","PT","QA","RO","SA","SG","SK","SI","ZA","ES","LK","SE","CH","TW","TH","TN","TR","UA","AE","UY","UZ","VE","VN","BO","EE","LV","NI","PY","KH","AF","GE","IQ","LY","MA","MZ","MM","YE","BH","CY","MT","RS","BJ","BF","CM","CG","CI","JO","LA","ML","SN","TZ","UG","ZM","ZW"],"pre_order_countries":[],"website_url":null,"app_id":661192272,"app_view_url":"/ios/cn/hua-fang-liu/app/wei-qi-guan-zi-da-quan/661192272/","country":"CN","icon_url":"https://is1-ssl.mzstatic.com/image/thumb/Purple71/v4/d1/ba/e0/d1bae053-eff8-afba-5e84-49debeed7f2d/mzl.kavlbuxj.png/150x150bb.jpg","name":"围棋官子大全","os":"ios","price":{"currency":"CNY","value":0,"string_value":"¥0.00","subunit_to_unit":100},"publisher_id":540626230,"publisher_name":"华芳 刘","publisher_profile_url":"/publisher/ios/540626230","rating":4.047619047619047,"rating_breakdown":[3,1,1,3,13],"rating_count":21,"country_release_date":1372636800000,"current_version":"3.0.1","file_size":24080384,"first_released_in":["US","AU","CA","CN","FR","DE","GB","IT","JP","KR","RU","DZ","AO","AR","AT","AZ","BB","BY","BE","BM","BR","BG","CL","CO","CR","HR","CZ","DK","DO","EC","EG","SV","FI","GH","GR","GT","HK","HU","IN","ID","IE","IL","KZ","KE","KW","LB","LT","LU","MO","MG","MY","MX","NL","NZ","NG","NO","OM","PK","PA","PE","PH","PL","PT","QA","RO","SA","SG","SK","SI","ZA","ES","LK","SE","CH","TW","TH","TN","TR","UA","AE","UY","UZ","VE","VN","BO","EE","LV","NI","PY","KH","MZ","YE","BH","CY","MT","BJ","BF","CG","JO","LA","ML","SN","TZ","UG","ZW"],"minimum_os_version":"8.0","publisher_country":null,"recent_release_date":1476662400000,"release_date":1372705928000,"release_status":"WORLDWIDE_RELEASE","supported_languages":["EN","ZH"],"worldwide_release_date":1372636800000,"store_removal_date":null,"cohort_id":null,"worldwide_last_month_revenue":{"unit":"cent","type":"currency","currency":"USD","value":100000},"worldwide_last_month_downloads":{"unit":"unit","type":"integer","value":1000},"category_rankings":{"app_id":661192272,"country":"CN","ipad":{"top_free":{"all_categories":null,"primary_categories":[{"6006":null}],"sub_categories":[]},"top_grossing":null,"top_paid":null},"iphone":{"top_free":null,"top_grossing":null,"top_paid":null}}}