To lishogi--make a new variant!

I want lishogi to make a new ancient shogi variant--Shoshogi.
·Rule:
One more drunk elephant(known as DE or 象)which promates as prince(known as +DE,Pr or 子)
moves as
O O O O O O
O 象 O O 子 O
O O O O O
If you are chackmated but the prince is still alive,you can play it then.
No piece drops.
The others are just like Standard Shogi.

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github.com/WandererXII/lishogi/issues/709

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