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Some data is technically necessary to be able to visit the page at all. A so-called cookie stores identifiers that make it possible to respond to your individual requests. It contains a session ID - a unique, anonymous user ID combined with an authentication identifier (user_data). A security identifier (csrf) is also stored to prevent a particular type of online attack. All of these fields are alpha-numeric, with almost no relation to your real identity. The only exception is that we monitor some requests with the IP address that you are currently using, so that we are able to detect malicious use or system defects. Additionally, a technical field is stored (singletab) to ensure that some interactions are only processed in the browser tab that is currently active. For example, a new chess game will not be opened in all your current tabs. We use your local storage to save the difference between your local clock and our server time (serverUserTimeOffset), so that we are able to display the date and time of events correctly for you. You can also enable more data fields, as described in the other sections. Your personal decision on which data storage to enable is also stored as necessary information (consent).

We offer a range of personal settings for your convenience. Options include which opponents you prefer to be paired against, your preferred chessboard and pieces, the board size, the volume setting of the video player, your preferred language, whether to show chat or chess notation, and more. You can use our web page without storing this data, but if you would like to have your individual settings remembered we recommend enabling this feature. For logged-in registered users this setting is mandatory to store information about your privacy settings, users you have blocked and your friendship settings. As a registered user we also store your data consent in these settings.

We embed a Twitter feed showing activity for the hashtag #c24live and also make it possible to share content in social networks such as Facebook and Twitter. If you enable this option social networks are able to store data in your cookies or local storage for the purpose of these features.

启用此功能可使我们收集更多个人测量和统计信息，以便更好地决定哪些内容和功能对您很重要，应优先对其进行改进。

为了帮助负担免费服务的费用，我们希望向您展示合作伙伴网络的广告。这些网络成员将数据存储在所显示的横幅上，并尝试投放相关广告。如果您选择不允许此类数据，我们将不得不显示更多匿名广告，并且我们提供的免费服务将受到更多限制。我们使用Google服务来展示广告。您可以在此处找到有关数据处理方式的详细信息： https://policies.google.com/technologies/ads

对于注册用户，我们会存储一些其他信息，例如个人资料数据、已对弈的对局、国际象棋分析会话、论坛帖子、聊天和消息、您的好友和被屏蔽的用户，以及您购买的物品和订阅。您可以在个人资料中找到这些信息。使用此应用程序不需要免费注册。如果您决定与支持团队联系，则会创建一张包含您的姓名和电子邮件地址的信息票证，以便我们对您的关注做出回应。该数据在外部服务Zendesk中进行处理。如果您订阅新闻通讯或已注册，我们会不定期地通过电子邮件向您发送更新。您可以退订新闻通讯，并且作为注册用户，您可以应用多个邮件设置来控制电子邮件地址的使用方式。对于新闻通讯，我们会将您的电子邮件地址和用户名转移到外部服务MailChimp。如果您在Chess24上购买内容或订阅，我们将与支付服务提供商Adyen合作，后者会收集您的支付数据并处理有关支付的信息，例如欺诈保护数据。