[Event "?"] [Site "?"] [Date "????.??.??"] [Round "?"] [White "White to play and mate in 2"] [Black "?"] [Result "*"] [Annotator "peter"] [SetUp "1"] [FEN "3r4/1R1p1B2/2Pkn1P1/1P2R3/8/8/1BQ5/6K1 w - - 0 1"] [PlyCount "3"] [EventDate "2023.??.??"] [SourceVersionDate "2020.04.01"] {[#]} {The basic challenge is that after most of White's first moves Black can play Kd7 and White cannot get both c8 and c6 under control on the next move. So White takes control of c6 with his or her first move. It may at first seem that 4 different rook moves would win for White but only one does.} 1. Re1 { Moving the rook along the 5th rank is not good enough as White needs the knight to be pinned after 1...Ke7. Each of the other rook moves on the e-file also fail.} (1. Re2 $2 Nc5 {the rook on e2 prevents Qh2#}) (1. Re3 Kd5 { now Re3 is not mate}) (1. Re4 Kd5 {now Re4 is not mate}) 1... Kd5 (1... Nc5 2. Qh2#) (1... Nf4 2. Ba3#) (1... Ke7 2. Qc5#) (1... dxc6 2. Qxc6#) (1... Rh8 { or rook to any oither square} 2. Rxd7#) 2. Rd1# *