[Event "2019 Australian Open"] [Site "chess24.com"] [Date "2018.12.27"] [Round "1.3"] [White "Wan, Dennis"] [Black "Cheng, Bobby"] [Result "0-1"] [WhiteElo "1853"] [BlackElo "2510"] [ECO "B06"] [Opening "Modern: 3.Nf3 d6"] 1.e4 g6 2.d4 Bg7 3.Nf3 d6 4.c4 Nf6 5.Nc3 O-O 6.Be2 e5 7.d5 a5 8.a3 Nbd7 9.O-O Nc5 10.Bg5 a4 11.Nd2 Bd7 {_MARK:DIAGRAM_} 12.b4? {This is a positional disaster.} axb3 13.Nxb3 Na4 14.Nxa4 Bxa4 {Now White just has a weak "a" pawn, a weak "c" pawn and a weak square on c5... all because he played b4.} 15.Qd3 b6 16.Rae1 h6 17.Bxf6 Qxf6 18.Na1 Qe7 19.Qg3 Qe8 20.Bd3 f5 21.f4 exf4 22.Qxf4 g5 23.Qf3 Bc3 24.Rb1 f4 {Black is totally dominating the black squares. _MARK:DIAGRAM_} 25.h4 {Now is not the time to attack ...25.h3 was more prudent.} Bd7 26.hxg5 Bd4+ 27.Kh1 hxg5 28.g4 fxg3 29.Qxf8+ Qxf8 30.Rxf8+ Rxf8 31.Kg2 Be5 32.Nc2 Rf2+ 33.Kg1 Rd2 34.Ne1 Bd4+ {and it's mate in a few moves.} {#R} 0-1