The silver cannon captures in the same way as the gold cannon, but can only move by leaping over an intervening piece, called a "screen". This is the move and capture of the "cannon" (Po) of Korean chess (janggi). The silver cannon may promote (optionally) if it begins or ends its move in one of the last 3 ranks of the board. On promotion it becomes a flying silver cannon. As a flying silver cannon it has the same powers as the flying gold cannon. It may therefore move orthogonally over whole rows and is able to leap one piece while moving. It can also move one square diagonally, or move or capture two squares diagonally, by leaping an adjacent piece.