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Fridrik Olafsson vs Larry Evans
Dallas (1957), Dallas, TX USA, rd 10, Dec-10
King's Indian Defense: Fianchetto. Panno Variation (E63)  ·  1/2-1/2

8
7
6
5
4
3
2
a
1
b
c
d
e
f
g
h
White to move.
ANALYSIS [x]
Notes by Stockfish 11 (minimum 6s/ply)better is 12.Bb2 e5 13.Nd1 Nh5 14.e4 f5 15.exf5 gxf5 16.Bc3 Nb7 = +0.17 (29 ply)= -0.47 (24 ply) 13...Re8 14.Nde4 b4 15.Nxf6+ exf6 16.Nd1 Bh6 17.Bc1 Bxc1 = -0.37 (18 ply)= +0.47 (21 ply)better is = 0.00 (21 ply) 15.e4 Nh5 16.Ne3 f5 17.exf5 gxf5 18.Bf3 Qg5 19.Bxh5 f4 ⩲ +0.55 (26 ply) ⩱ -0.95 (20 ply)better is 16.e3 Qb6 17.a3 Bb7 18.Bxb7 bxa3 19.Rxa3 Rxb7 20.f4 d5 = 0.00 (28 ply) ⩱ -0.67 (29 ply) 19.Ndc4 Nd4 20.Qd3 Bc8 21.Rf1 Be6 22.a4 bxa3 23.Rxa3 d5 = -0.39 (26 ply) ⩱ -1.15 (29 ply) 20.Qd1 Bc8 21.Bxd4 cxd4 22.Qc2 Bh6 23.Nxf6+ Qxf6 24.Nc4 ⩱ -0.74 (27 ply) ∓ -1.79 (24 ply) 21.Nf4 Ng4 22.Nf3 d3 23.Nxd3 Bxa1 24.Rxa1 Rxf3 25.Bxf3 ⩱ -1.03 (24 ply) ∓ -1.85 (27 ply) 27...Rbe8 28.Nxc3 Qxc3 29.Qxc3+ bxc3 30.Bd3 Rf3 31.Be2 ∓ -2.13 (34 ply) ⩱ -1.33 (32 ply) 30...Rbe8 31.Qe2 Re5 32.Rd1 Qf3 33.Qxf3 Rxf3 34.Rxd6 ∓ -1.69 (32 ply)+- +4.16 (35 ply) = 0.00 (21 ply)+- +3.75 (27 ply) = 0.00 (19 ply) 38.Qd2+ Qd4 39.Qe2 Kc6 40.h3 Qa1+ 41.Kg2 Qxa2 42.Qe4+ Kd6 +- +5.28 (9 ply)= 0.00 (28 ply) 39...Raf8 40.Qd3+ Ke5 41.f3 R8f7 42.f4+ gxf4 43.Rh5+ Rf5 = 0.00 (24 ply) 40.Rg7 Raf8 41.f4 Qe3+ 42.Kh1 Re6 43.Qc4 Qf3+ 44.Kg1 +- +2.94 (29 ply)= 0.00 (20 ply)= 0.00 (30 ply) after 43.Bg2+ f3 44.Qa6+ Kd5 45.Qd3+ Kc6 45.Qa7 Qf3+ 46.Bg2 Qe3 47.Qd7 Qe1+ 48.Kh2 Qg3+ 49.Kg1 = 0.00 (30 ply); 45...Qc3 46.Qe2+ Qe3 47.Qg2 R8f7 48.Rh8 f3 49.Re8+ Kd6 -+ -3.36 (23 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
Dec-07-14  Howard: Evans analyzed the adjourned position in his book Chess Catechism (sp). In it, he argues that 41.f4 almost forced a win, but not quite.

But in a 1978 issue of Chess Life and Review, some alert reader submitted an extensive analysis of that position which seemed to argue that 41.f4 should have won by force.

Anyone with a computer wanna tackle this ?

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