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Thomas Dybdahl Ahle is owner and primary developer of [[PyChess]], a [[GUI|chess client]] and engine for the [[Linux]] desktop. He is further author of the didactic [[Python]] [[:Category:Open Source|open source chess engines]] [[Sunfish]] <ref>[https://www.techradar.com/author/jonni-bidwell Jonni Bidwell] ('''2016'''). ''Python: Sunfish chess engine''. [https://en.wikipedia.org/wiki/Linux_Format Linux Format], [http://www.itu.dk/people/thdy/papers/sunfish.pdf pdf]</ref> and [[FastchessFastChess]], the latter a one-layer [[Neural Networks|neural network]] [https://en.wikipedia.org/wiki/Softmax_function softmax] model, combined with a [[Monte-Carlo Tree Search]].