The right way to check

As can often be seen in the mansubat, the player for which we must find a winning play is just one move away from mate: in this problem, back must continue to give check to white until he is mated. There are several possibilities to do this, but what is the right order?

White:
King d3; General a3; Rook b3, f3; Knight d2; Elephant c5, h3; Pawns d4, f4, g5, h4. (11 pieces).

Black:
King d1; Rook c8, e8; Knight a4, d5; Elephant a6; Pawns f5, g6, h5. (9 pieces).

Black to play and win.

Solution