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a Dutch youth chess player and operator of her father's, [[Richard Pijl|Richard Pijl's]] engines [[Crashtest Dummy]] and [[The Baron]] at various tournaments, notably the [[ICT 2007]], [[ICT 2013]], the [[DOCCC 2007]] and the [[CPT 2008]], where Tessa acted not only as operator but also as host. More recently, she operated [[Arasan]] in various [[CSVN Programmers Tournament|CSVN Programmers Tournaments]], and The Baron at the [[WCCC 2015]].