[Event "2025 National K-12 Chess Championship"] [Site "Spokane, WI USA, United State"] [Date "2025.12.14"] [Round "5.14"] [White "Thimmasamudram, Sandeep"] [Black "Zhu, Ryan"] [Result "0-1"] [WhiteElo "2084"] [WhiteTeam "USA"] [BlackElo "2101"] [BlackTeam "USA"] [Annotator "Foisor,Sabina"] [Variant "Standard"] [ECO "?"] [Opening "?"] [StudyName "2025 National K-12 Grade Championships"] [ChapterName "(9th) Thimmasamudram, Sandeep - Zhu, Ryan"] [ChapterURL "https://lichess.org/study/eJCWlgC8/DzcdvR0x"] [FEN "6k1/7p/3b2p1/1p1Pq3/2p3P1/2P2K2/1PBQ4/8 w - - 0 39"] [SetUp "1"] [Orientation "white"] { Opposite-colored bishop positions with queens on the board are dangerous, as each side has an extra piece on half the squares. Here, White failed to defend, playing } 39. Bd1?? (39. Qg2 { could have kept White's chances to a draw alive } 39... Qxd5+ 40. Be4) 39... Qg3+ 40. Ke4 h5! 41. gxh5? { The final mistake after which it is all over! } (41. Qe3 { the resulting position is still difficult for White } 41... Qe5+ 42. Kf3 Qxd5+ 43. Ke2 Qg2+ 44. Qf2 Qxg4+ 45. Qf3 Qe6+ $19) 41... Qe5+ 42. Kf3 Qxh5+ 43. Kf2 Qh2+ 44. Ke1 Bg3+ { 0-1 Black wins. } 0-1