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a [[Chess#Variants|chess variant]] which incorporates the [[Shogi]] rule in which a player can drop a [[Captures|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 <ref>[https://en.wikipedia.org/wiki/Crazyhouse Crazyhouse from Wikipedia]</ref>.
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]] [[GUI|GUIs]] to support Crazyhouse as well as other variants and games <ref>[http://hgm.nubati.net/ WinBoard 4.7]</ref> , and also published his new engine [[CrazyWa]] which supports Crazyhouse plus five Shogi variants <ref>[http://www.open-aurec.com/wbforum/viewtopic.php?f=2&t=53808 New crazyhouse engine] by [[Harm Geert Muller]], [[Computer Chess Forums|Winboard Forum]], December 31, 2016</ref>. [[Multi Variant Stockfish]], a [[Stockfish]] fork maintained by [[Daniel Dugovic]] <ref>[https://github.com/ddugovic/Stockfish GitHub - ddugovic/Stockfish: Multi-variant fork of popular UCI chess engine]</ref> <ref>[https://github.com/ddugovic/Stockfish/wiki Home · ddugovic/Stockfish Wiki · GitHub]</ref>, incorporated in various [[Lichess]] projects <ref>[https://lichess.org/blog/V7BNKCcAACQA3UmP/stockfish-is-learning Stockfish is learning | Blog • lichess.org]</ref> <ref>[http://www.talkchess.com/forum/viewtopic.php?t=61126 Awesome lichess :-)] by [[Marco Costalba]], [[CCC]], August 14, 2016</ref>, is able to play Crazyhouse as well. In 8 months, Stockfish-Crazyhouse was improved by 800 Elo points <ref><range type="comment" id="613929073_1">[http:''//35.161.250.236:6543/regression</range id="613929073_1">Multi-Variant Stockfish Testing Framework]</ref>. In 2016, [[Ferdinand Mosca]] started to play Crazyhouse tournaments <ref>[http://www.talkchess.com/forum/viewtopic.php?t=61306 1st CCC World Computer Crazyhouse Championships] by [[Ferdinand Mosca]], [[CCC]], September 02, 2016</ref> to maintain a rating lists <ref>[https://sites.google.com/site/zhassociation/ Crazyhouse Chess Variant Association] by [[Ferdinand Mosca]]</ref>.
=Engines=
