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什么都行：程序缺陷、错误的题目、购买方面的疑问，或者不同意某个评判。请用英语或保加利亚语书写。
支持
找个人问
这里没有工单系统，没有聊天机器人，也没有装着四百篇文章的帮助中心。只有一个邮箱地址和一份故障清单，两者都直接通到写这个应用的人手上。
故障清单
GitHub Issues
凡是你更愿意公开处理的事情——以及凡是别人日后需要能找到的事情，这适用于大多数缺陷报告。
当一道题出错时
寄来四样东西，核对只需一分钟。
- 题目界面上显示的 FEN——长按即可复制。
- 你走的那一步，以及应用称为正确的那一步。
- 当时在哪个模式。
- 应用版本，可在信息界面看到。
题目偶尔会与更深的搜索相抵触，而这类抵触集中在那些漫长、平静、评分很高的局面上——它们的要点比核验所及之处更深。这是核验的边界，而不是题目的错误——但值得知道具体是哪些，而知道的唯一途径就是你说出来。
问题
问得够多，值得写下来。
- Does it need an internet connection?
- No. The engine, the puzzles and your progress are all on the device. The single exception is online play, which needs Game Center to reach the other person.
- Is there an account?
- There is none to create. Your ratings and history live in the app’s own container on your device, and deleting the app deletes them.
- What is free?
- Playing is free and stays free — against the engine, against a person over Game Center, and the nine hundred games in Watch — all unlimited. On top of that a free account gets five a day of each kind of training: five tactics puzzles, five Rush runs, five positional exercises, five endgame drills and five games to judge. The allowance resets at nine in the morning, local time.
- Why is there no advertising?
- Partly taste and partly licence. The app links two engines — Stockfish under the GPLv3 and Reckless under the AGPLv3 — and compiling a proprietary advertising SDK into the same binary would make the combined work undistributable under either. Selling the app is fine; copyleft has never forbidden charging. Bolting a closed SDK onto it is not.
- Are my puzzle ratings the same as a FIDE rating?
- No, and they run several hundred points higher. They measure progress against yourself, not strength against a field.
- Where do the puzzles come from?
- Most are from the Lichess puzzle database, released into the public domain under CC0, carrying ratings calibrated against millions of real solving attempts. The rest were mined locally by having Stockfish play itself and keeping only positions where one move is far better than every alternative.
- Can I see the source code?
- Yes. The app carries the GNU Affero General Public License version 3 — the terms Reckless brings with it, which the GPLv3 of Stockfish permits combining with — and the complete corresponding source is published on GitHub.
- Which engine am I playing?
- Whichever you chose in Settings. Stockfish and Reckless are both compiled into the app, and one of them plays, grades and labels everything. They are not equivalent: Stockfish can be asked to play anywhere from about 1400 to full strength, while Reckless has no strength limiter and plays at full strength or not at all.