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Jesse Kraai vs Eric Schiller
National Open (2002), Las Vegas, NV USA, rd 5, Mar-10
Nimzo-Indian Defense: Panov Attack. Main Line (E54)  ·  1/2-1/2
ANALYSIS [x]

FEN COPIED

Annotations by Eric Schiller.      [184 more games annotated by E Schiller]

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Kibitzer's Corner
Sep-19-07
Premium Chessgames Member
  gambitfan: 55... ♘d1?
55... ♔b4!

The target of the Black King should be c1 in order to control the Bishop...

I feel that this game was a draw because the Black King was restricted and was not able to reach a position wher he would have been able to support his would-be queening pawn...

Am I right ??

Sep-19-07
Premium Chessgames Member
  SwitchingQuylthulg: <gambitfan> This game is a draw (both my feeling and tablebase's) even if your suggestion of 66...Kb4 is played (and please, use the right move numbers - they aren't all that hard to figure out if you look at the moves before and after...)

All of this also applies to I A Horowitz vs Boleslavsky, 1946 where it seems to me that Black's king just heads for h8 so he can exchange at g4 if White's knight tries to block the bishop. For example 67.Kf4 Kd8 68.Ng4 Bxg4 draw.

Sep-19-07
Premium Chessgames Member
  SwitchingQuylthulg: <gambitfan> The stronger side's chances of winning such positions largely depend on whether or not he's able to keep the opposing king away from the pawn for long enough. Here for example after 66...Kd2 White's king can't get to the pawn very easily and Black will win.
Sep-19-07
Premium Chessgames Member
  gambitfan: Can't we say as a rule that if the Black King manages to reach the c3 case, then the black b-pawn will be queening ??
Sep-19-07
Premium Chessgames Member
  SwitchingQuylthulg: <gambitfan> No, reaching c3 usually isn't enough if White's king makes it to the e-file - here, for example, 66...Kc3 67.Ke3 draws as Black can't make further headway with his king. Black's king is blocked from going to c2 so White doesn't even need the threat on Black's knight to get there in time. Black can't stop White from playing Kd1, when any interposition at c2 will be out of the question probably forever. Even if Black could stop Kd1 (by bringing his king to d2 and later c1) winning would depend on him getting his knight to c2 and pawn to b2 before White can get his king to c3 (controlling the interposition square). For example here 66...Kd2 wins because Black's knight gets at c2 in time - at d2 Black's king is an ideal blockader totally cutting off its White counterpart but he still has to be careful. If Black's knight were at, say, h6 it would be too far away from the interposition square and White would be able to draw even after 66...Kd2 despite being blocked off d1.
Sep-19-07
Premium Chessgames Member
  gambitfan: Thanks a lot <SwitchingQuylthulg> for your long explanation... I will be trying very hard to understand it and to put it into practice in my present correspondence chess game with this type of ending...
Jul-08-09  Chess Addict: Why is 19...Nc6 a good move? It's looks like it's just a normal developing move to me.
Jun-23-16  Smothered Mate: I realize the moves after 58 are presumably just analysis, but according to the Lomonosov tablebases, at least one of ​ ​ ​ black's 62 ​ black's 63 ​ ​ ​ gives away a win:

The Lomonosov tablebases indicate that black has a forced mate-in-at-most-23 starting with ​ 62. ... Kxa4 , ​ but those tablebases and standard tablebases agree that ​ 64. Kg4 ​ draws. ​


(The win starts with ​ ​ ​ 62. ... Kxa4 ​ 63. Kf5 Ka3 ​ .)

After ​ ​ ​ 62. ... Ng1 ​ 63. Kf5 ​ , ​ ​ ​ both tablebases agree that both immediate captures only draw, and Stockfish at 43 ply evaluates the best _other_ move as just [-0.04]. ​ ​ ​ ​ ​ ​ ​ ​ (Also, just-in-case, I checked the position between the 62's with Stockfish, and it's 36-ply eval of Kxa4 was [-11.48].)

Thus, it's highly probable that ​ 62. ... Ng1 ​ throws away the win and ​ 63. Kf5 ​ keeps the now-draw.

Jun-23-16  Smothered Mate: Bearing that in mind, my engine analysis seems to indicate that ​ 58. Ka6 ​ loses, and Bc2 was the only drawing move.

The main line is ​ ​ ​ 58. Bc2 Nb8 ​ 59. Bd1 Nc6+ ​
60. Ka6 Nd4 ​ 61. Kb7 b3 ​ 62. Bxb3 Nxb3 ​ 63. Kc7 ​ .

The Lomonosov tablebases indicate that Bxb3 draws,
​and 6-piece tablebases agree that Nxb3 draws,
​with Kc7 then being white's only drawing move.

Black's moves in that line _before_ Bxb3 are the only moves that Stockfish evaluates as better than [0.00] at slightly over 30 ply.

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