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Lajos Portisch vs Leonid Stein
Amsterdam Interzonal (1964), Amsterdam NED, rd 4, May-24
Benoni Defense: Hromadka System (A57)  ·  1-0

8
7
6
5
4
3
2
a
1
b
c
d
e
f
g
h
White to move.
ANALYSIS [x]
Notes by Stockfish 9 v010218 (minimum 6s/ply)better is 11.h3 Nf4 12.Bxf4 exf4 13.Qxf4 f5 14.O-O fxe4 15.Qxe4 ⩲ +1.04 (24 ply)better is 11...Na6 12.a3 Bd7 13.g3 Nc7 14.g4 Nf4 15.Bxf4 exf4 = +0.42 (22 ply) ⩲ +1.09 (21 ply) 15...Na6 16.h5 g5 17.O-O Nc7 18.Rae1 Kh8 19.Nh2 Rb8 20.b4 ⩲ +1.01 (21 ply) ± +1.82 (20 ply)better is 17...Kg8 18.Rde1 Nd7 19.Kb1 Bxf3 20.Ng5 Ne5 21.Nxf3 Rxf3 ⩲ +1.50 (22 ply) ± +2.13 (25 ply)better is 18...Rxf3 19.Rde1 Qf8 20.h5 Kg8 21.hxg6 Nd7 22.Be2 Ne5 ⩲ +1.50 (22 ply) ± +2.13 (24 ply)better is 24...Ng4 25.f3 Nf2 26.Be4 Bf8 27.Nf5 Nxh1 28.Rxh1 Rxf5 ± +1.75 (23 ply) ± +2.40 (23 ply) 26...Rf8 27.Nxh6+ Bxh6+ 28.Rxh6 R8f3 29.Kb1 Rf1 30.Rh7 +- +2.89 (26 ply)+- +4.33 (22 ply) after 27.Nxh6+ Bxh6+ 28.Rxh6 bxc4 29.bxc4 Raf8 30.d6 Rf1 38...Rxd7 39.Bxd7 Kf6 40.Ra8 Be3 41.Rf1+ Kg5 42.Rxa7 h3 +- +11.85 (25 ply)1-0

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

Annotations by Stockfish (Computer).      [35435 more games annotated by Stockfish]

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Kibitzer's Corner
Feb-20-10  jerseybob: What a stinker, the "Bad" Stein on full display, in contrast to his game vs Portisch at the 1962 Interzonal. Maybe 9..Ne8 would've been better, with the same object of f5 but keeping the knight in a safe place. The whole Nf4 thing just backfired.

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