CrazyWa, an open source engine for Shogi and Chess variants with piece drops such as Crazyhouse by Harm Geert Muller. Crazywa is XBoard compatible and handles boards up to 11x11, with up to 16 droppable piece types, and 15 promoted piece types [1].
CrazyWa logo [2]

Forum Posts

• New crazyhouse engine by Harm Geert Muller, Winboard Forum, December 31, 2016
• Crazywa 1.0.5 source-code release by Harm Geert Muller, CCC, February 18, 2018

External Links

• hgm.nubati.net Git - crazywa.git/summary

References

1. ^ hgm.nubati.net Git - crazywa.git/blob - dropper.c
2. ^ hgm.nubati.net Git - crazywa.git/blob - logo.png

What links here?