My Loss against Ivanov in 2nd round of TNM anallyzed by IM Elioot Winslow in TNM Newsletter

(14) Uzzaman,Ashik (1931) - Ivanov,Aleksander (2171) [B23]
Mechanics' Spring TNM: 2000+ San Francisco (2.14), 26.03.2019
[Winslow,Elliott]

1.e4 c5 2.Nc3 Nc6 3.f4 g6 4.Nf3 Bg7 5.Bb5 Nd4 6.0-0 [6.Bc4; 6.Bd3] 6...Nxb5 [6...a6; 6...e6] 7.Nxb5 d5 [7...d6] 8.exd5 a6 9.Nc3 Nf6 10.d4 Nxd5 11.dxc5 Nxc3 12.Qxd8+ Kxd8 13.bxc3 Bxc3 [13...Kc7!? 14.Nd4 Rd8 15.Be3 Bf5] 14.Rb1 Kc7 [14...f6!?] 15.Rb3 Bf6 16.Bd2

I would like to ask both players if they knew what a theoretical rabbit-hole they went into with this line! There are over 60 games here! 16...a5 [16...Be6 has been most often played: 17.Ba5+ (17.Rb6!? a5) 17...Kc6 But this might well not be the best! (17...Kb8!! is Stockfish's adamant (and unplayed!) preference, with a slight plus! 18.Rd1!! b5!!) 18.Rb6+ Kxc5 19.Nd2 Bxa2! according to Stockfish the only 0.00 move (19...Bd5; 19...Bd4+ 20.Kh1 Bxa2 21.c3!N +-) ; 16...Bf5 17.Ba5+ Kc8 18.Rb6 Rd8 19.c6 bxc6 20.Rxc6+ Kd7 21.Rxf6 exf6 22.Rd1+ Ke8 23.Bxd8 Rxd8 24.Rxd8+ Kxd8 25.Nd4 saw White grind to the edge of a win and then miss; ½-½ (78) Keller,C (2200)-Leon Hoyos,M (2521) Metz 2010] 17.a4? Lets Black out. [17.Rfb1 Ra7 18.Rb5 (18.c6! (Stockfish 10) 18...Kxc6! 19.Be3 Ra6 remains tense but Black is no worse) 18...Bd7! 19.Rb6 (19.Bxa5+ Kc8 20.c6 (20.Bb6?! Rxa2 21.Ra5 Rxa5 22.Bxa5 Bf5 (22...Bc6=/+) 23.Ne5 Bxc2 24.Rc1 Be4 25.Rd1 Bxe5 26.fxe5 Bf5 27.Bb6 h5 28.Kf2 Be4 29.g3 e6 30.Rd6 Bc6 31.h4 Rf8 32.Ke3 Bd7 33.Rd1 Bc6 34.Rd6 f6 35.Rxe6 fxe5 36.Rxg6 Kd7 37.Rg5 Rf3+ 38.Ke2 e4 39.Rxh5 Bb5+ 40.Kd1 e3 41.Re5 e2+ 42.Kd2 Rd3+ 43.Kc2 Rxg3 44.Ba5 Kc6 45.Bd2 Bd3+ 46.Kc3 Kb5 47.Be1 Rh3 48.Kd4 Bg6 49.c6+ Kxc6 50.Re6+ Kd7 51.Rxg6 Rh1 52.Rg7+ Kc6 53.Rg6+ Kd7 54.Rg7+ Kc6 55.Rg6+ Kd7 1/2-1/2 (55) Lazar,A (2129)-Danner,G (2401) Pula 2012) 20...Bxc6 21.Rc5 e6 22.Bc3 Bxc3 23.Rxc3=/+) ] 17...Be6-/+ 18.Rb6 Rhd8 19.Rfb1 Bd5 20.f5 slightly suicidal [20.Be3 Rd7 (20...Bc6) ] 20...gxf5 21.Bf4+ Kc8 [21...Kd7] 22.Ne5 Bxe5 23.Bxe5 Bc6

Quite an amazing situation, that Black is as won as he is here. 24.Bc3 [24.Rf1] 24...Rd5 25.Re1 Kd7 [25...Rxc5!] 26.Re5 Rxe5 27.Bxe5 Ke6 28.Bf4 Rd8 29.Rb3 Rd4 30.Bc7 Rxa4 31.Rh3 Ra1+ 32.Kf2 a4 33.Rh6+ f6 34.Rxh7 a3 35.Rh8 a2 36.Ra8 Bd5 37.h4 Rc1 38.h5 a1Q 0-1