White to move and win !
1.Rd3! Black king is actually being "caged in a mating net. His escaped square on e7 and g7 is well guarded by white's bishop on f6. White plan to play Rh3-Rh8++ checkmate. Black can avoid it by giving material with 1...Re6 1...Nc8?? 2.Rh3! Nxa7? 3.Rh8++ mate 2. Rh3 Rxf6 3. Rh8+ Kg7 4.Rxb8 and black is down in material and will lost the game.