A Horse planted at the initial position of the opposing 7th (or 3rd) Pawn, for example a red Horse at B73, is given the name “Upper Angler’s Horse” (高钓马). Together with a Chariot, it may pose immediate checkmate threat to the opposing King, if his majesty is on the side of the palace, on the same wing.
The black King is in the most vulnerable position in respect to red’s Upper Angler’s Horse. It is stranded at that dead corner. R1=4 will also checkmate in addition to R1+5.
Two examples of using the Upper Angler’ Horse in RH mating attack.
On the second Chariot check, the King may not return to his throne, else comes H5+4 the Corner Horse checkmate.
If black replies P3+1 at the start, red will win in same pattern with lesser moves. Note how the Chariot penetrates the Cannon’s defence.