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1. Bc5+ Kb5
2. R1a4!
To prevent escape via c4. King is trapped and black can’t prevent R7a5#, since he can’t push the c6 pawn, and the c3 and f6 pawns stop black bishop from interfering.
2. … Ra8
3. Rxa8 Rxd4 or any
4. R8a5#
Should be mate in 4.
1.Bc5+.Kb5
2.R1a4.
A>2….Rd4.3.R7a5#
B>2.any other.3.Rb4#
Harry
Bc5+ Kb5
Ra1-a4 (guards the c4 square)
White can either play Ra7-a5# or Ra4-b5# on the next move.
1.Bc5+ Kb5
2.R1a4 followed by
3.R7a5#
Bc5
The need to keep black from opening a safe hole on c6, and to keep the black king out of c4 on subsequent moves should lead one to find the mating line.
1. Bc5+ Kb5
2. R(1)a4
and Black can’t stop
3. R(7)a5++.
I missed:
2. … Ra8
3. Rb4#
So it’s mate in 3, not 4 as I said.