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Michael Adams vs Tony Miles
Tilburg Interpolis (1993), Tilburg NED, rd 2, Nov-17
Sicilian Defense: Dragon. Classical Variation General (B72)  ·  1/2-1/2

8
7
6
5
4
3
2
a
1
b
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d
e
f
g
h
White to move.
ANALYSIS [x]
1/2-1/2

rnbqkbnr/pppppppp/8/8/8/8/PPPPPPPP/RNBQKBNR w KQkq - 0 1
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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 1 OF 2 ·  Later Kibitzing>
Feb-13-04  Whitehat1963: Adams' longest in the database.
Feb-13-04  WMD: 90.b8=N is a rare practical example of necessary underpromotion.
Jul-24-05  WMD: Tony Miles: 'It was actually drawn around move 135, but neither the players nor the computer monitor could keep track during the final time scramble.'
Aug-15-06  LivBlockade: Not that it matters, but could both players have really overlooked 116. ♘c3+ winning the rook and drawing instantly?
Aug-15-06  dzechiel: Saw this one pretty quickly (just a couple of seconds, [it helped to know that this was "defence" week]).
Aug-15-06  RandomVisitor: can Black maintain a small advantage with 76...Re8 ?
Aug-15-06
Premium Chessgames Member
  cu8sfan: <this was "defence" week> I thought it was "swindle week". Nice puzzles, though, I like that style.
Aug-15-06  tjshann: "White to play and draw in 32 moves."
Aug-15-06  ahmadov: It is obvious that white has to promote to a knight, otherwise a loss is imminent.
Aug-15-06  syracrophy: Quite easy puzzle. 90.b8=N was obviously the only saving resource for white. Promote to a piece that protects the a6-pawn and avoid the mate, because 90.Ka3?? Rxa6+ 91.Kb4 Rb6+ and curtains down.

Quite easy. There was no other possibility with other moves

Aug-15-06  HelaNubo: Why not simply 93.a7 forcing an immediate draw? or white was looking for a win with 93.Nc6?
Aug-15-06  chessmoron: Got it. But the 32 moves after move 90. was unnecessary. Waste of time and energy.
Aug-15-06  syracrophy: As <HelaNubo> pointed out, it was an immediate draw after 93.a7 Rd1 94.Ka5 Ra1+ 96.Kb6 Rxa7 97.Kxa7 1/2-1/2
Aug-15-06  khense: I'm sure there are some positions where K & R win against K & N. However after 97 Kb4, if black wants to win, he can only hope for a blunder
Aug-15-06  prinsallan: Missed this. I figures it was an underpromotion to knight, but it felt like a lost game anyway ;D
Aug-15-06  pebble767: It perplexed me for a second but I laugh when I realized the answer.
Aug-15-06  Bg2: W made error, after 88...Kc2 89.Ka3 Rd3+ 90.Ka4 Rb3 91.a6 Kc3 92.a7 and wins
Aug-15-06  WarmasterKron: I saw it all the way to the end in 0.00001 seconds. Honest.

I did see the underpromotion, though.

Aug-15-06  EmperorAtahualpa: Yep, solved this one! It would have been nicer I think if this puzzle started a couple of moves earlier.
Aug-15-06  Aristarch: <Bg2: W made error, after 88...Kc2 89.Ka3 Rd3+ 90.Ka4 Rb3 91.a6 Kc3 92.a7 and wins> No, it's still a draw after 88. ... Kc2 89. Ka3 Kc3! (not Rd3+?) 90. Ka4 (Ka2 Kc2) Kc4! 91. a6 Rd1! 92. Ka3 (Ka5 Kc5 93. Ka4 Ra1+ 94. Kb3 Rxa6 95. b8=Q Rb6+ 96. Qxb6 Kxb6) Kc3 93. Ka2 Rd2+! 94. Kb1 (Ka3 Rd1) Rd1+ 95. Ka2 Rd2+, and a clear draw is reached, only much faster!
Aug-15-06
Premium Chessgames Member
  chessgames.com: <It would have been nicer I think if this puzzle started a couple of moves earlier> We tried, but it would kill the puzzle's theme. Tablebase indicates that 89.Ka3 is also good for a draw, and it need not involve underpromotion.
Aug-15-06  cavaleiro: <LivBlockade: Not that it matters, but could both players have really overlooked 116. c3+ winning the rook and drawing instantly?>

That's an interesting observation. How could Adams overlook it?

Aug-15-06  RandomVisitor: Rybka scores the game as drawn after 60...Ke8 and thinks that 60...Bg8 is the last attempt to maintain a slight Black advantage.
Aug-15-06  Sami Jr: Question: Is it not possible for Adams to actually win this instead of forcing a draw? If the game was played up to 93 as carried out and then if 93 a7 instead of Nc6, how does black prevent white from promoting the "a" pawn as well? (leading to a win for Adams). Am I missing something here? I would appreciate some input here.
Aug-15-06
Premium Chessgames Member
  Richard Taylor: Fatigue.

The "solution" move was obviously to make knight - an interesting struggle.

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