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Arthur Bisguier vs Aleksandar Matanovic
Bled (1961), Bled YUG, rd 18, Sep-30
Bogo-Indian Defense: Grünfeld Variation (E11)  ·  0-1

ANALYSIS [x]

FEN COPIED

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Kibitzer's Corner
< Earlier Kibitzing  · PAGE 4 OF 4 ·  Later Kibitzing>
Jan-07-17  NBZ: I see that I mucked up the obvious line, and found a way to delay the mate by 4 moves. At least it's still well within the 50 moves rule :)
Jan-07-17  AlicesKnight: I was a little surprised that 86.h6 was not tried, but <YouRang> seems to have it right.
Jan-07-17  lost in space: Got that right away
Jan-07-17  gofer: This was far to easy for a <Saturday>.

A forced mate in six moves is hardly rocket science!

All you have to work out is that once the king is on a2, the best checking square for the "mobile" knight is c1. From there you simply have to find a path to reach c1 and then count the number of moves. If the h pawn promotes before the check on c1, then its a draw if it doesn't then its a win...

85 ... Nf5
86 Ka2 Nd4
87 h6 Nb3/Ne2
88 h7 Nc1+
89 Ka1 Nd2
90 h8=Q Nb3#

Jan-07-17
Premium Chessgames Member
  agb2002: Black has two knights for a pawn.

Black can deliver mate with 85... Nf5:

A) 86.h6 Nc3 87.h7 Nd4 88.h8=Q Nb3#.

B) 86.Ka2 Nd4 87.h6 (87.Ka1 Nc3 as above) 87... Nb5 88.h7 Nc3+ 89.Ka1 Nd4 90.h8=Q Nb3#.

Jan-07-17  morfishine: Another solution is the maneuver Nd2-f1-g3 followed by Nxh5; White would then be free to execute the 2N mate in 379 moves subsequent to the obligatory opponent's blunder

*****

Jan-07-17
Premium Chessgames Member
  thegoodanarchist: This is great - I can replay a game from 55 years ago whenever I want.

Can I replay any and every pro soccer or football or basketball (or baseball or whatever) game from 1955, whenever I want?

I might get lucky and find it on youtube, or most likely no. But with chess? Close to 90% or more of them, and this one is a treat.

Jan-07-17
Premium Chessgames Member
  Sally Simpson:


click for larger view

Just one of the great attractions of Chess. With the pawn on h5 it is a win. With no pawn on h5 it is a draw.

Won a pint once in Sandy Bells by saying I could mate with two Knights v a bare King. The lad was positive no such position could be set up unless it was in the corner of the board.


click for larger view

1.Nb6+ Kc8 2.Ne6 mate.


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Not forced but it is checkmate. Which brings us on nicely to Kotov vs Najdorf, 1953


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Kotov wanted to play on explaining to the perplexed Najdorf that a Siberian amateur had worked out a forced mate with the two Knights. (see thread)

Jan-07-17  YouRang: It looks like black could have unleashed his Nh6 a couple moves earlier, when he faced this position.


click for larger view

The N that prevents the king from escaping via a3 does that job just as well here at c4 as it would at b1. He could now play <83...Nf6> and proceed with the same technique described by <An Englishman> above.

This is not a criticism though. Black played this difficult ending excellently since the final capture back on move 68. I assume he moved his N to b1 because the technique he was familiar with concluded with this mating pattern.

Most GMs play a whole career without needing this ending technique, so it's impressive that he knew it so well.

~~~

Looking at endgame explorer, I see that there are 55 game in the cg.com database with this ending.

Of these, 30 finished a draw:
Endgame Explorer: NN vs P

And 25 in which the 2N side won:
Endgame Explorer: NN vs P

Jan-07-17
Premium Chessgames Member
  Jimfromprovidence: The text after 85...Nf5, below. ( white gets mated in 5 moves)


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The same position as above but with the pawn on h6.


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White to play and draw.

Jan-07-17  YouRang: One of the interesting drawn P vs NN games featured Anand failing to find the right technique. I just put some comments about it there:

Wang Yue vs Anand, 2009 (kibitz #13)

Jan-07-17  1 2 3 4: Unbelievably easy for a Saturday
Jan-07-17  YouRang: <Jimfromprovidence><White to play and draw.>

An interesting "White to play a draw" problem because it's really *black* who must find the right technique. ;-)

Jan-07-17  ChessHigherCat: Two knights is the night (everlasting)
Jan-07-17  varishnakov: 85...Nf5 86.Ka2 Nd4 87.h6 Nb5 88.h7 N5c3+ 89.Ka1 Nd2 90.h8=Q Nb3#
Jan-07-17  Marmot PFL: If WK is on a2 black mates with Ns on b1 and c1, if the K stays on a1 than the mate happens with Ns on b3 and c3. The Nf5-Nd4-Nb3 path isn't too hard to find.
Jan-07-17  petemccabe: When I was maybe 10, Bisguier played a simultaneous exhibition in my home town (Scarsdale, NY). This is the first time I've seen a game on Chessgames featuring a player I've played against!

Meanwhile, being a casual (1500 or so) player, I always thought K+NN v K was a draw. I had no idea that an extra pawn could make things worse for the King.

Jan-07-17  Kasparov Fan: a very interesting position indeed
Jan-07-17  Absentee: <1 2 3 4: Unbelievably easy for a Saturday>

Yeah, I'd like to think I'm good, but this was easier than most Saturdays.

Jan-08-17  schachfuchs: Nobody likes my final moves 89.Ka1 Nc3 90.h8=Q Nb3# ? ;-)
Jan-08-17  N0B0DY: <schachfuchs> That's exactly right!
Jun-18-18  Omnipotent00001: 64. Kb2 and black wins 90 moves later
Aug-18-18
Premium Chessgames Member
  imsighked2: I would never have believed one could win with just two knights.
Aug-19-18  Howard: That h-pawn makes all the difference--pure and simple.
Jul-22-19  doash: Can K+N always force a lone K into a corner?
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