アリス将棋Alice Shogi

Every move sends the piece through to the mirror board.
Gote's hand
Status
Board A
Board B (Mirror)
Sente's hand

The Alice rule

A piece moves and captures using the board it currently sits on. After the move, it teleports to the same square on the other board — only if that square is empty there.
Check only comes from pieces on the same board as the king. Hand pieces may be dropped on either board.