Chess Puzzles

White to move - mate in 1

#141 Chess: 5334 Problems, Combinations, and Games by László Polgár

Puzzle rating: 1368

[FEN "8/8/4NN2/8/8/5k2/8/R4K2 w - - 0 1 KQkq - 0 1"] [NAVIGATION "0"] [CUSTOM_MOVE "1"] 1. Ra3#