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As [https://en2.wikipedia.org/wiki/Open_source_movement open source] and game programmer, Folkert is author of the experimental chess programs [[Pos]] <ref>[http://www.vanheusden.com/pos/ POS - An experimental chess program]</ref> and [[DeepBrutePos]] <ref>[http://www.vanheusden.com/DeepBrutePos/ DeepBrutePOS - An experimental chess program]</ref>, both written in [[Java]]. A incarnation of DeepBrutePos, running on a system with an [[UDOO]] computer and seven [[Raspberry Pi]] calculating nodes is dubbed [[PuppetMaster]] <ref>[http://www.talkchess.com/forum/viewtopic.php?t=52280&start=11 Re: CSVN 1st Open Internet Tournament: Results and games] by [[Folkert van Heusden]], [[CCC]], May 12, 2014</ref> . Former experimental chess programs were [[Embla], [[CPP1]] <ref>[http://www.vanheusden.com/cpp1/ CPP1]</ref> , [[Bullucks]] <ref>[http://www.vanheusden.com/bullucks/ Bullucks]</ref> and [[QueenBee]]. His latest chess engine, first released in August 2015June 16, is the [[UCI]] compliant [[EmblaMicah]] <ref>[http://www.vanheusden.com/EmblaMicah/ EmblaMicah] by [[Folkert van Heusden]]</ref>, in 2016 incorporated inside a self made [[Embla Board|chess computer board]] based on a [[Raspberry Pi#3|Raspberry Pi 3]] <ref>[http://www.talkchess.com/forum/viewtopic.php?t=59977 chess computer board] by [[Folkert van Heusden]], [[CCC]], April 27, 2016</ref>.