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==Databases==
===Chess Problem Database Server===
[https://pdb.dieschwalbe.de/ Chess Problem Database Server] is online [[database]] of all types of [[chess problem]]s, maintained by [[Gerd Wilts]], hosted by [[Die Schwalbe]]. Database incorporated [[John Niemann]] collection and the work of a lot of contributors. Database has 428,703 problems (as of November 2019). Problems are represented graphically with solutions and commentary.
==Other==
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