| kingscrusher: <hankm> I know I am more than 9 years too late to add to the reply chorus, but after Qd1 white has 4 different ways of being equal: Mamadzhan Mukhitdinov - Tigran Vartanovich Petrosian 0-1 13.0, Tashkent m 1951
click for larger viewAnalysis by Stockfish 14:
1. = (0.03): 30.Qf2 g6 31.Bb7 Qd6 32.g3 Kg7 33.Qf7+ Kh6 34.Re1 Rd7 35.Bf3 Bd8 36.Qe6 Kg7 37.Bg4 Qd5+ 38.Qxd5 Rxd5 39.Re2 Rd6 40.Kg2 b4 41.Rc2 a5 42.Bf3 Kf6 43.Bb7 2. = (0.00): 30.Qc1 Qxc1 31.Rxc1 Ba3 32.Rf1 Rd2 33.Bb7 a5 34.g3 g6 35.Ba6 Kg7 36.Bxb5 Rxa2 37.Bc4 h5 38.Re1 h4 39.gxh4 Bd6 40.Re2 Ra1+ 41.Kg2 a4 42.Re6 3. = (0.00): 30.Qb1 Qxb1 31.Rxb1 b4 32.g3 Rd2 33.Rc1 g6 34.Rc2 Rxc2 35.Bxc2 Kf7 36.Bd3 a5 37.Bc4+ Kf6 38.Bg8 h6 39.Kg2 Ke5 40.Bf7 g5 41.Kh3 Kd4 42.Kg4 Kc3 43.Kh5 4. = (0.00): 30.Qa1 Qxa1 31.Rxa1 b4 32.g3 Rd2 33.Rc1 g6 34.Rc2 Rxc2 35.Bxc2 Kf7 36.Bd3 a5 37.Bc4+ Kf6 38.Bg8 h6 39.Kg2 Ke5 40.Bf7 g5 41.Kh3 Kd4 42.Kg4 Kc3 ( a way of losing follows : ) -
5. -+ (-5.75): 30.Bxh7+ Kxh7 31.Qf2 Qd3
32.Qf3 Qxf3 33.gxf3 Rd2 34.a4 b4 35.Re1 Bf6 36.Re6 a5 37.Ra6 Bd8 38.f4 Rd3 39.f5 Rxb3 40.f6 gxf6 41.Rd6 Ra3 42.Rxd8
The position is equal
(Gavriel, 30.09.2021)
It seems earlier in the game, at move 22, Bb4 is curiously very strong: Mamadzhan Mukhitdinov - Tigran Vartanovich Petrosian 0-1 13.0, Tashkent m 1951
click for larger viewAnalysis by Stockfish 14:
1. -+ (-3.78): 22...Bb4 23.Qc2 Qc5 24.Nef5 bxc4 25.bxc4 g6 26.a3 Ba5 27.Nd4 Rxd4 28.Bxd4 Qxd4 29.Rad1 e4 30.Nxe4 Nxe4 31.Rxd3 Qxc4 32.Qe2 Nd2 33.Re3 Nxf1 34.Rxe6 Nd2 35.Qxc4 Nxc4 36.h4 Nd2 37.Bd5 Kh8 38.Rxa6 Rf1+ 39.Kh2 Bc7+ 40.Kh3 I think the issue is that in White trying to "exploit" Petrosian's isolated e pawn ends up creating a tonne of tactical downsides. Sometimes Petrosian perhaps tells intuitively if he can "afford" visual downsides like an isolated pawn - so they are not really that "exploitable". White goes into weird knots based on e5 and optimistic moves like Qe1. | 
Kibitzing
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