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Boris Spassky vs Tigran Petrosian
Petrosian - Spassky World Championship Match (1969), Moscow URS, rd 15, May-21
Russian Game: Cozio (Lasker) Attack (C42)  ·  1/2-1/2

8
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1
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White to move.
ANALYSIS [x]
Notes by Stockfish 9 v010218 (minimum 6s/ply)12.Ne4 was played in Timman vs Piket, 1995 (1-0)13.Bh4 was played in McShane vs Lagno, 2004 (1-0)better is 15...O-O 16.Ne4 a5 17.Nxf6+ Bxf6 18.c3 a4 19.a3 Rfd8 = -0.13 (25 ply)= +0.43 (27 ply) after 16.Ne2 Ng4 17.Rf1 Bd6 18.h3 Nf6 19.Kb1 O-O 20.Ne5 Rfe8 better is 19.Kb1 Bd6 20.Ne2 Rfe8 21.g4 b6 22.Ne5 Bb7 23.Ng3 c5 = +0.14 (26 ply)= -0.44 (29 ply); 20.Nf3 Bd6 21.Ne2 b6 22.Kb1 Nc7 23.c3 Re7 24.g4 c5 = 0.00 (25 ply)1/2-1/2

rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1
FEN COPIED

Annotations by Stockfish (Computer).      [35437 more games annotated by Stockfish]

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Kibitzer's Corner
Apr-06-08  Knight13: 20. Nf5 followed by f4 and g4. I prefer white.
Aug-19-14  Zhbugnoimt: Knight13: yes you are right, white is slightly better here, but I guess Spassky didn't feel like fighting that day
Aug-20-14  Petrosianic: Spassky had just barely escaped from a long dead lost ending the game before. He needed a breather.
Nov-28-16  Petrosianic: <20. Nf5 followed by f4 and g4. I prefer white.>

In a club game, it might be worth continuing. Among GM's, after 20. Nf5 Bf8, and Black is rock solid. With Queens off, a kingside attack isn't going anywhere.

Black might even be a little better. 20. Nf5 Bf8 If 21. f4, as you suggest, then g6 kicks the Knight right back again. To where? h4? g3? Neither looks great. Black reponds with Bd6, and the f pawn is a target. g3 and then the h pawn is a target. g3 and h4, and White's kingside is more porous than it needed to be.

Or maybe 21. g4 first, preventing an immediate g6. Black plays 21...Ng5 and White's kingside is porous again. He probably has to play 22. Bxg5, giving up the two Bishops, and forget about any White advantage. Or 22. Rh 1, but it's hart to advance in a meaningful way.

I prefer Black, if White tries your f4, g4 plan. But if he doesn't, it's about dead equal.

Nov-29-16  RookFile: Spassky made the right move by agreeing to a draw here.

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