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John van der Wiel vs Ulf Andersson
Moscow Interzonal (1982), Moscow URS, rd 2, Sep-08
Sicilian Defense: Najdorf Variation. Main Line (B99)  ·  0-1

ANALYSIS [x]

FEN COPIED

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Kibitzer's Corner
Apr-14-13  vinidivici: Wanna draw?

Its easy: Sacrifice both pawns!!
main:
52.g5!! Kxg5 (first sacrifice)
53.b7!! Rxb7 (second sacrifice)
54.Kd3 Rb3+
55.Ke4...DRAW

Now from that conclusion we know, the 2 black pawns in the same file could be useless if we know how white should defend....

But actually its the finesse of Ulf that made the win so special. He's smart enough not to take the pawn at the move 50.

if 50...Kxg4 51.b6 Rd7 52.b7! Rxb7 53.Kd3 Rb3+ 54.Ke4...draw

See that after 52...Rxb7 the position almost similar with the main draw line except now the black king at g4 (instead g5)....its both draw.

From both lines we can take the straight logic...black king needs to protect the e3 pawn because the threat of white Kd3, so from this POV Ulf's 50.Kf4 is the RIGHT THING to do.

So unfortunate for Der Wiel didnt find 52.g5!! but even that, there is another draw chance once more, look the last line under.

Theres another smart move again by Ulf beside 50...Kf4. That is 53...Kg3 (instead 53...Ke4).

53...Ke4 straight to the draw. 54.b7!! Rxb7 55.Kd1 ...draw white king soon in front of the pawn.

If 54...e2 (instead Rxb7) 55.b=Q e=Q 56.Qe8+...draw

Back to the main draw line, how if black reject the pawn

main2
52.g5 Kg3
53.Rh6 e5
54.b7! e2
55.b=Q e=Q
56.Qb3+ Kf2
57.Rh2+ Kg1
58.Rh1+ Kxh1
59.Qh3+ Kg1
60.Qxd7...apparently still DRAW.

Another draw line
Besides all the lines above, even without 52.g5, white could hope the draw with 53.Rh2 (53.Rf6? is a mistake).

If 53...Kxg4 then 54.b7 we already know draw.
53...Kf3 (53...Kg3 54.Rh5) 54.Rh3+ Kf2 55.Rh2+ Kg3 56.Rh5 Rd2 57.Kc1 Rd5 58.b7 e2 59.Rh1 Rd8 60.b=q Rxq 61.Kd2....draw, black pawn will down soon.

sources:
-my analysis (partly)
-Mednis' Practical Endgame Lessons
-sec

Apr-16-13  vinidivici: I made the further analyzes, well because i got nothing to do right now so i think its ok if i put the results. The efforts just reinforces the lines that i have posted above. <Another draw line

Besides all the lines above, even without 52.g5, white could hope the draw with 53.Rh2 (53.Rf6? is a mistake).>

I want to single out the Rh2 variation.

<53...Kf3 (53...Kg3 54.Rh5) 54.Rh3+ Kf2 55.Rh2+ Kg3 56.Rh5 Rd2 57.Kc1 Rd5 58.b7 e2 59.Rh1 Rd8 60.b=q Rxq 61.Kd2....draw, black pawn will down soon.> Yes it still draw.

If 53...Kxg4 then 54.b7 we already know draw.

But apparently there are 2 more candidate moves for black 53...e4/Kg3...

53.Rh2 e4...now white has the new aspect of the problem. 54.g5! Kxg5

55.Rh3! (now the second pawn sacrifice doesnt come into account anymore because rook at 2nd rank is a burden 55.b7 Rxb7 56.Rh3 ((56.Kd1 Rb1+ 57.Kc2 Rf1...0-1 white rook in that position is the burden)) Rd7 57.Rxe3 Kf4 58.Re1 e3 0-1...now the white king cut off along the d-file and the king at the long side just doesnt help because rook would go to the short side and not enough to get the proper checks. This for example after 58.Re1 compare with the position i give this: black pawn same at e4, black king at d4, black rook at f7, white rook at e1, and white king at g2; whoever move still draw...see the different because now the position happened in reverse black at the short side and white rook soon to be in the long side)

55...Kf4
56.b7 Rd2+ (56...Rxb7 57.Kd1...draw)
57.Kc1 Rd8
58.b=Q Rxq
59.Kd1!! ...DRAW white soon to be in front of the pawn.

Whats left for black...53...Kg3

54.Rh1 Kg2 55.Rd1 Rxd1 56.Kxd1 Kf1 57.b7 e2+ 58.Kc2 e=Q 59.b=Q....draw, if you dont believe then we have tablebases!!

Conclusion
By no means to disparage the 52.g5 line, that i found another line to draw that is 53.Rh2!!, the prophylactic moves 53... Kf3/Kxg4/e4/Kg3 are no reflection of efficacy.

So van der wiel made a fatal mistake 53.Rf6+??, but to undermine that effort just unwise due to pressure of the real match, time trouble, etc etc.

SCE singles out the 52.g5 line is a way to draw, and doesnt put the 53.Rh2!! line at all. I should write my own book i think!!!

Apr-16-13  Xeroxx: interesting

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