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a family [[Chess Engine Communication Protocol]] aka [[WinBoard]] compliant chess engines by [[Sven Schüle]], first released in September 2016 as 32-bit binary running under [[Windows]].
Based on a [[Mailbox|mailbox]] [[Board Representation|board representation]], Jumbo applies [[Principal Variation Search|PVS]] with [[Transposition Table|transposition table]], [[Null Move Pruning|recursive null move]], and [[Internal Iterative Deepening|IID]] along with a minimalistic [[Evaluation|evaluation]] considering [[Material|material]], [[Piece-Square Tables|PST]], [[Mobility|mobility]], [[Passed Pawn|passed pawns]], and [[Weak Pawns|weak pawns]] <ref>[http://www.schuelebln.de/chess/jumbo/ The Jumbo Twins (WinBoard Chess Engine Family)]</ref>.
=Jumbo Twins=
[[FILE:Jumbo Backpulver.jpg|border|right|thumb| Jumbo in Advertisement <ref>[https://en.wikipedia.org/wiki/Advertising Advertisement] for Sterling's [https://en.wikipedia.org/wiki/Baking_powder baking powder] with Jumbo, the [https://en.wikipedia.org/wiki/Elephant Elephant], 19th century, in [https://en.wikipedia.org/wiki/Jan_Bondeson Jan Bondeson] ('''2008'''). ''Animal Freaks''. Paperback, [https://commons.wikimedia.org/wiki/Category:Jumbo Category:Jumbo - Wikimedia Commons]</ref>]]
Jumbo '''0.5.3''', released in September 2017 comes with an additional, [https://en.wikipedia.org/wiki/Conditional_compilation conditional compiled] [[Bitboards|bitboard]] representation, both are built from the same source tree as 32-bit and 64-bit programs <ref>[http://www.talkchess.com/forum/viewtopic.php?t=65286 Jumbo 0.5.3 - Birth of the Jumbo Twins] by [[Sven Schüle]], [[CCC]], September 25, 2017</ref>.
