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  1. Dec 2023
  2. twitter.com twitter.com
    Suren on X: "✅ https://t.co/5nGvHBm5Vo Today I made a video about Henrik Kasparian's chess puzzle database which includes 30 thousand chess puzzles! In the precomputer era Kasparian used index cards to select everything in one place, and it took him decades to complete! #chess #chesspuzzle https://t.co/V1H2PMKfjN" / X
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    1. chrisaldrich 24 Dec 2023
      Brian Stephenson@bstephen2·Aug 4, 2020The Pirnie Collection of #ChessProblem s is index cards in Clark's shoe boxes and is held in my house. The late JP Toft created a huge card database of #ChessProblem s in Scandinavia and is now held in a public library.

      https://twitter.com/bstephen2/status/1290562798616031235

      Pirnie Collection Duncan Pirnie Duncan Pirnie zettelkasten card index as database chess chess puzzles Genrikh Kasparyan shoeboxes J.P. Toft J.P. Toft's zettelkasten open questions
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    twitter.com/surenaghabek/status/1290290990603890688