[Event "how to play chess for beginners: Forming the barrier"] [Site "https://lichess.org/study/ajcKrErE/DqcPqVVs"] [Result "*"] [UTCDate "2020.05.01"] [UTCTime "23:58:50"] [Variant "Standard"] [ECO "?"] [Opening "?"] [Annotator "https://lichess.org/@/realhercules"] [FEN "8/8/8/5k2/R7/7R/8/4K3 w - - 0 1"] [SetUp "1"] [Source "https://lichess.org/study/ajcKrErE/DqcPqVVs"] [Orientation "white"] { White has formed a barrier with his a4 rook } { [%csl Ra4,Rb4,Rc4,Rd4,Re4,Rf4,Rg4,Rh4] } 1. Rh5+ { The King is under attack and must move out of check } 1... Kg6 { [%csl Gb5][%cal Gh5b5] } 2. Rb5 { The White rook swings to the other side of board to escape being captured } 2... Kf7 3. Ra6 Ke8 4. Rb7 Kf8 5. Ra8# { This process of forcing the King backward will always lead to a checkmate like this. The black King is in check and cannot move to a safe square so it is checkmate! } *