Crazyhouse

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Crazyhouse, a chess variant which incorporates the Shogi rule in which a player can drop a captured piece. A captured piece reverses its color and goes to the capturing player's reserve or pocket. At any time, instead of making a move with a piece on the board, a player can drop a piece from his reserve onto an empty square on the board.

Crazyhouse could be played with Zillions of Games by Jeff Mallett and Mark Lefler. A pioneer in implementing Bughouse and Crazyhouse with his engine Sunsetter was Georg von Zimmermann. More recently, Harm Geert Muller made the necessary extensions and generalizations of the Chess Engine Communication Protocol along with its XBoard and WinBoard GUIs to support Crazyhouse as well as other variants and games, and also published his new engine CrazyWa which supports Crazyhouse plus five Shogi variants. Multi Variant Stockfish, a Stockfish fork maintained by Daniel Dugovic, incorporated in various Lichess projects  , is able to play Crazyhouse as well. In 8 months, Stockfish-Crazyhouse was improved by 800 Elo points. In 2016, Ferdinand Mosca started to play Crazyhouse tournaments to maintain a rating lists.

=Engines=
 * Crazyhouse Engines

=See also=
 * Bughouse
 * Proof-Number Search
 * Shogi

=Publications=
 * Sacha Droste, Johannes Fürnkranz (2008). Learning of Piece Values for Chess Variants. Technical Report TUD–KE–2008-07, Knowledge Engineering Group, TU Darmstadt, pdf
 * Sacha Droste, Johannes Fürnkranz (2008). Learning the Piece Values for three Chess Variants. ICGA Journal, Vol. 31, No. 4
 * Johannes Czech (2019). Deep Reinforcement Learning for Crazyhouse. Master thesis, TU Darmstadt, pdf
 * Johannes Czech, Moritz Willig, Alena Beyer, Kristian Kersting, Johannes Fürnkranz (2019). Learning to play the Chess Variant Crazyhouse above World Champion Level with Deep Neural Networks and Human Data. arXiv:1908.06660
 * Johannes Czech, Moritz Willig, Alena Beyer, Kristian Kersting, Johannes Fürnkranz (2020). Learning to Play the Chess Variant Crazyhouse Above World Champion Level With Deep Neural Networks and Human Data. Frontiers in Artificial Intelligence » CrazyAra

=Forum Posts=

2000 ...

 * programs to play crazyhouse / w23 by Georg von Zimmermann, CCC, January 06, 2001
 * Sunsetter(C) source released by Georg von Zimmermann, CCC, June 04, 2001
 * Very interesting crazyhouse position-to Georg Zimmerman (sunsetter test) by Lieven Clarisse, CCC, November 11, 2002

2005 ...

 * Variants and Board Size by Harm Geert Muller, CCC, October 25, 2007
 * BugHouse / CrazyHouse under Winboard by Harm Geert Muller, CCC, October 29, 2007
 * Winboard Crazyhouse alpha testers wanted! by Harm Geert Muller, CCC, October 31, 2007
 * Variant ICS by Harm Geert Muller, CCC, January 13, 2009

2010 ...

 * Shogi now operational on Variant ICS by Harm Geert Muller, CCC, October 11, 2010
 * Xboard crazyhouse problem by Steven Atkinson, CCC, March 23, 2012
 * Piece drops and horizon effect by Harm Geert Muller, CCC, September 12, 2013
 * Creating a crazyhouse opening book for xboard by Isaac Haïk Dunn, CCC, June 16, 2014

2015 ...
2016 2017
 * UCI engins for Suicide, Wild, Crazyhouse... by Tasic Vladimir, CCC, March 24, 2015
 * Crazyhouse by Ferdinand Mosca, CCC, May 02, 2015
 * Awesome lichess :-) by Marco Costalba, CCC, August 14, 2016
 * 1st CCC World Computer Crazyhouse Championships by Ferdinand Mosca, CCC, September 02, 2016
 * Crazyhouse tournaments and rating list by Ferdinand Mosca, CCC, September 08, 2016
 * Proof-number search by Harm Geert Muller, CCC, October 20, 2016 » Proof-Number Search
 * QS in Crazyhouse by Harm Geert Muller, CCC, October 24, 2016
 * Stockfish Crazyhouse Engine by Andreas Paulick, CCC, November 04, 2016
 * Crazyhouse Computer Championships 2016 by Ferdinand Mosca, CCC, November 17, 2016
 * Human vs Engine Top Crazyhouse match ! by Vincent Lejeune, CCC, December 01, 2016
 * Crazyhouse, man vs machine, the return of the revenge ! by Vincent Lejeune, CCC, December 13, 2016
 * crazyhouse promotions by Erin Dame, CCC, December 30, 2016
 * New crazyhouse engine by Harm Geert Muller, Winboard Forum, December 31, 2016 » CrazyWa
 * Swiss Crazyhouse Tournament by Carlos Pagador, CCC, January 02, 2017
 * Winboard variants online by Erin Dame, CCC, March 22, 2017 » Chess Variants, WinBoard
 * crazyhouse tips? by Erin Dame, CCC, March 27, 2017
 * 2nd Crazyhouse Computer Championships 2017 by Ferdinand Mosca, CCC, December 07, 2017

=External Links=
 * Crazyhouse from Wikipedia
 * Crazyhouse by Fergus Duniho, The Chess Variant Pages
 * Crazyhouse Chess Variant Association by Ferdinand Mosca
 * 1st CCVA Computer Championships 2016 - Challonge

=References=

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