RJT chess -- General Ideas 2 (Attack series)

Here is a nice picture I made using screenshot and Qianhong (Go try it.), showing a position (well... yea) with red to move.



Red appears to be winning. However, if for example, R2=5, K5=6, and there is (for now) no mate! And in this game, that's a scary thought. It's tiring to think of a mate...
Instead, there exists a (hopefully I'm correct...) miraculous move in this situation! Can you find it? (Yes you can...)

C1-1!

This move prevents the shi from being any useful in the defence of the king. Amazing move!... right?

Let's assume black totally does not see the danger of this, and plays a random move!

... P5+1

Suddenly...
R2=5+
...K5=6 (K5=4 is just suicidal)
R5-1+
...K6-1 (forced)
C1=4, planning R5+1 the next move. Good game; well played!

Edit: Swapping the first and second moves totally appears to work better. Awww...