This is quite often used in Xiangqi. The chariot hides behinds the cannon, so that when the cannon is moved, the chariot delivers a check. The cannon can be used to take away the opponent's pieces or maneuver itself to a better position.
There is a reason for the name of this kill. In ancient times, when medicine men were making pills in ancient china, urns were used. It is said that in the process of making such pills, there were rumbling noises. This checkmate was named after the rumbling noises.
First created: April 2011
Last updated: 13th May 2013
Ref: Various material found over the internet.
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