Mahony v. IM Arjun

I am playing in the February 2021 Gramdmasters Institute tournament. My first round opponent was IM Arjun. I missed a chance to gain an edge with my 12th move. Here you go!

[Event "GMI February 2021 Tourney"]  [Site "lichess.org"]  [Date "2021.02.04"]  [Round "1"]  [White "MIchael, Mahony"]  [Black "Arjun, Kalyan"]  [Result "0-1"]  [ECO "B23"]  [WhiteElo "2153"]  [BlackElo "1500"]  [Annotator "Tactical Analysis 4.0 (6s)"]  [PlyCount "57"]  [EventDate "2021.??.??"]   {[%evp 11,52,-6,-8,-43,-43,-43,-39,-39,-22,-18,-19,-19,0,0,5,-166,-155,-151,  -130,-150,-153,-216,-226,-208,-154,-207,-180,-243,-234,-252,-252,-252,-252,  -480,-382,-382,-384,-388,-378,-371,-362,-523,-517]} 1. e4 c5 2. Nc3 Nc6 3. f4  g6 4. Bb5 Nd4 5. Bc4 Bg7 6. Nf3 d6 7. Nxd4 {B23: Closed Sicilian: Lines  without g3.} cxd4 8. Ne2 Nf6 9. d3 {Black is slightly better.} Qb6 10. O-O O-O  11. Qe1 {[#]} (11. Bb3 Be6 12. Bxe6 (12. Kh1 Bxb3 13. axb3 $11 {[%eval -17,22]}  ) 12... fxe6 13. Kh1 $11 {[%eval -11,24]}) (11. Kh1 e6 (11... Ng4 12. Rb1 Bd7  13. h3 $11 {[%eval -9,23]}) (11... d5 12. exd5 Qc5 13. c3 $11 {[%eval -9,24]}))  (11. f5 e6 12. fxg6 hxg6 13. Bb3 $11 {[%eval -18,23]}) (11. a4 Qc5 (11... d5  12. exd5 Qc5 13. Ng3 $11 {[%eval 0,24]}) 12. Ng3 h5 (12... Bg4 13. Qe1 $11) 13.  Qe1 $11 {[%eval -10,25]}) (11. h3 d5 12. exd5 Qc5 13. Ng3 $15 {[%eval -47,24]})  11... Rd8 $146 ({Predecessor:} 11... Bd7 12. Kh1 (12. a4 a5 13. f5 $11) 12...  Rac8 13. Bb3 Qc5 14. Qh4 a5 15. c4 dxc3 16. bxc3 Qh5 17. Qf2 Ng4 {0-1 (30)  Biasi,I-Rosell,S (1995) Helsingor 2015}) (11... e6 12. Bb3 $11 {[%eval -26,18]}  Bd7 13. Qg3 $11 {[%eval -15,21]}) (11... a5 12. a4 Qc5 13. Bb3 $11 {[%eval -6,  22]}) 12. f5 d5 ({I had feared the move} 12... Nxe4 13. dxe4 d3+ 14. Kh1 (14.  Rf2 dxe2 15. c3 e6 16. fxg6 $11 {[%eval 9,25]}) 14... dxe2 15. Qxe2 $11 {  [%eval 28,20]} e6 $14 {[%eval 33,21]} 16. Bg5 $14 {[%eval 32,24]} (16. fxg6 $14  {[%eval 44,24]})) 13. e5 $2 {[%eval -166,18] [#]} ({I don't know why, but I  thought I had to push the e-pawn here. I missed the follow up after} 13. exd5  $11 {[%eval 5,18] and White has nothing to worry.} Nxd5 14. fxg6 hxg6 15. Nf4)  13... dxc4 14. exf6 Bxf6 {...cxd3 is the strong threat.} ({Stronger than} 14...  Qxf6 15. fxg6 Qxg6 16. Nf4 $11) 15. fxg6 hxg6 16. Kh1 {[%eval -216,21]} (16.  Ng3 $17 {[%eval -153,18]}) 16... cxd3 $19 17. cxd3 Kg7 18. Qg3 {[%eval -207,19]  } (18. Ng3 $17 {[%eval -154,18]}) 18... Rh8 19. Ng1 {[%eval -243,20]} (19. Bg5  $142 {[%eval -180,19]}) 19... Rh5 20. Nf3 Bf5 21. Rd1 Rah8 22. Qf2 $2 {[%eval  -480,20]} (22. Kg1 {[%eval -252,20] was called for.}) 22... Bg4 23. Bf4 Rf5 24.  Bg3 Bxf3 25. gxf3 Bg5 26. f4 {[%eval -523,20] [#]} (26. Qg2 $142 {[%eval -362,  17]}) 26... e5 $1 {[%mdl 512] Weighted Error Value: White=0.47/Black=0.12} 27.  Qf3 (27. fxg5 Rxf2 28. Bxf2 Rh5 29. h4 $19 {[%eval -642,26]}) 27... Bxf4 28.  Bxf4 $19 {[%eval -553,20]} Rxf4 $19 {[%eval -610,23]} 29. Qg2 $19 {[%eval -640,  25]} 0-1

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