[Event "Round 6: Mateusz Bartel - M. Amin Tabata"] [Site "lichess.org"] [Date "2023.12.07"] [White "Mateusz Bartel"] [Black "M. Amin Tabatabaei"] [Result "0-1"] [WhiteElo "2659"] [BlackElo "2692"] [Annotator "https://lichess.org/@/Shohreh_b"] [Variant "From Position"] [ECO "?"] [Opening "?"] [FEN "1rb1k2r/p1q2pbp/2p1p2p/2P5/N3Q1P1/8/PP3P1P/2KR1B1R b k - 0 16"] [SetUp "1"] [Source "https://lichess.org/study/BR7gZIqE/iCqcfNMG"] [Orientation "black"] { Very sharp middlegame position is on the board. Black has the bishop pair White has the better structure and more room for his pieces. While the Bg7 and Rb8 are very active, the bihop on c8-looks sad and queen is tied down to c6-pawn and if Black castles White will play Bd3. What should Black play? } 16... O-O! { Anyway! Otherwise White would eventually take advantage of Black king in the center. Opposite side castling situation arises. Now the one who reaches the opponent's king will win. } 17. Bd3 Rd8 { We witness if there's a bishop on g7 it's impossible to mate Black king with just Queen and Bishop battery. } 18. Bc2 { Another critical position. } (18. Qxh7+ Kf8 { This doesnt achieve anything. }) 18... Rd5! { Another strong move using the weak d5-square. } 19. f4 { White tries to organize his attack. } { [%cal Gf4f5] } (19. Rxd5? cxd5 { Black would repair his structure with winning position. } { [%csl Ga4,Gb2][%cal Gc8d7] }) 19... Qa5 { [%cal Gb8b4] } 20. a3?! { This looks like the proper way to defend, but there's immediate blow! Black to play! } (20. b3 Ba6) 20... Rxb2!! 21. Nxb2 Qxa3 { Black will immediately regain his material with attacking position, he's winning. } 22. Rxd5 Bxb2+ 23. Kd2 cxd5 24. Qe3 Qb4+! { Obviously if opponent's king is in danger you should avoid exchange of queens. } 25. Ke2 Ba6+ 26. Bd3? (26. Kf3 { Stockfish wishes to hide on the kingside. } 26... Bd4) 26... Bd4 27. Qd2 Bc3 28. Qe3 Qb2+ 29. Kf3 Bd2?? { Time trouble causes this error. } (29... Bb7 30. Bxh7+ Kxh7 31. Kg3 d4 32. Qd3+ Kg7 33. Rg1 Bc6 34. h3 Ba5 35. Kh4 Bd8+ 36. Kg3) 30. Rb1?? { White returns the favor. Stockfish gives the forcing line as leading to equal position. } (30. Qe2 Qc3 31. Rd1! Bxd3 32. Qxd2 Be4+ 33. Kf2 Qxc5+ 34. Kg3 Qa3+ 35. Kh4 Qe7+ 36. Kg3 h5 { but Black is the one pressing. }) 30... Qxb1 31. Bxb1 Bxe3 32. Kxe3 Bb7 33. Kd4 f6! 34. Bd3 { [%cal Gd3b5] } 34... Bc6! 35. Ba6 Kf7 36. h4 h5! { Tabatabaei shows nice endgame technique. With this move black achieves zugzwang position either removing the blockade of the a-pawn or play ...e5. } 37. g5 (37. gxh5 h6 38. Bd3 a5) 37... e5+! 38. Ke3 (38. fxe5 fxg5 39. hxg5 h4 { and it'll be too much to handle both a and h pawns and the black king. }) 38... fxg5 39. fxg5 h6 { White resigned. } 0-1