King activates the mating diagonal
Objective: White to move. Reposition the king and open the bishop’s mating diagonal.
Position and task condition
The black king is surrounded by pieces from both sides, and the queen on g2 looks dangerous. White needs a quiet move that leaves Black only one defence.
FEN
8/8/8/8/p1K1Rn1B/P2P1k1P/6qR/7B w - - 0 1Theme: Quiet move and bishop mate