Are these tactics created manually or by computers?

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Thund3rSt0rm225
I read that there are more than 65,000 tactics. Are these generated manually or by computers? I'm guessing the latter. If you open these tactics through browsers such as chrome, you can see that they are tagged and have rating as well. So computers know what different themes such as pin, skewer, double attack, decoy, deflection etc are. The website shows analysis of a user's performance and the tactics adapt to a user's abilities. It's interesting to see how sophisticated computers (AI) have become now. I'm fairly impressed by this. I'm sure there are more advanced examples of AI but I think chess.com was able to do a good job with this tactic trainer. Anybody wants to comment more on this? Please share expert insights only. No trolling please.
Martin_Stahl

There a core set of tactics that come from a tactics collection that is in the public domain, there are a number submitted by members and I'm pretty sure they do some computer based selection off of games played on the site and then use manual verification and modification on those to make sure they are good tactics.

 

https://support.chess.com/customer/en/portal/articles/1444815-where-do-all-of-these-tactics-come-from-

Thund3rSt0rm225
Ok. Thanks for the info.