[Event "10 Elementary Fortresses: Fortress 4"] [Site "https://lichess.org/study/sUF6Ik0A/uXJXuPpd"] [Result "*"] [Variant "Standard"] [ECO "?"] [Opening "?"] [Annotator "https://lichess.org/@/Vagerhook"] [FEN "6k1/7p/8/6KP/3B4/8/8/8 w - - 0 1"] [SetUp "1"] [UTCDate "2020.04.17"] [UTCTime "21:25:57"] [Source "https://lichess.org/study/sUF6Ik0A/uXJXuPpd"] [Orientation "white"] 1. h6?? { After the unfortunate h6, the position becomes a fortress for black. } (1. Kh6 { was easily winning. } 1... Kf7 2. Kxh7 { [%cal Gh5h8] } 2... Kf8 3. Kg6 Kg8 4. h6 Kf8 5. h7 Ke7 6. h8=Q) 1... Kf8 2. Kf6 Kg8 3. Be5 Kh8?? (3... Kf8 $10) 4. Kf7# *