[Event "U.S. Championship"] [Site "St Louis"] [Date "2023.10.08"] [Round "4.2"] [White "Pourkashiyan, Atousa"] [Black "Yu, Jennifer"] [Result "1-0"] [WhiteElo "2288"] [WhiteTeam "United States"] [BlackElo "2294"] [BlackTeam "United States"] [Annotator "Davis Zong Jr."] [Variant "From Position"] [ECO "?"] [Opening "?"] [FEN "q7/Pr1Q1ppk/3B3p/b1p5/3p4/3P3P/5PP1/R5K1 w - - 0 39"] [SetUp "1"] [Source "https://lichess.org/study/b0nfXV2i/6tNVmUst"] [Orientation "white"] 39. Qxb7! { A lot of moves win here, but try to find the queen sacrifice which wins on the spot! } 39... Qxb7 40. Rxa5 Qa8 { Without perpetual threats (White's dark-squared bishop sits perfectly to prevent perpetuals), the queen is helpless. } 41. Bxc5 Kg6 42. Bxd4 f6 43. Be3 Kf7 44. Rb5 { 1-0 White wins. } 1-0