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1. Bc5+ Kb52. 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. ... Ra83. Rxa8 Rxd4 or any4. R8a5#Should be mate in 4.
Bc5+ Kb5Ra1-a4 (guards the c4 square)White can either play Ra7-a5# or Ra4-b5# on the next move.
1.Bc5+ Kb52.R1a4 followed by 3.R7a5#
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+ Kb52. R(1)a4and Black can't stop3. R(7)a5++.
I missed:2. ... Ra83. Rb4#So it's mate in 3, not 4 as I said.
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