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John J Cox vs David Guthrie
4NCL 2016/2017 (2016), Reading ENG, rd 1, Nov-19
King's Indian Defense: Makagonov Variation (E71)  ·  1-0


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Kibitzer's Corner
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Premium Chessgames Member
  patzer2: For today's Wednesday puzzle I went with 40. Re5, which allows 40...Rxa6 41. Rxa6 +- (+2.08 @ 41 ply, Stockfish 8).

My 40. Re5 might win with difficulty, but it's not near as strong as the game continuation 40. Rexe6! +- (+12.62 @ 41 ply, Stockfish 8).

According to the computer, Black's decisive mistake was 16...Re8?! allowing the strong winning move 17. Ng5! +- (+2.39 @ 33 ply, Stockfish 9 analysis of move 17.?).

Instead of 16...Re8?!, Black could have put up more resistance with 16...Nxe4 17. 0-0 ± (+1.38 @ 32 ply, Stockfish 9 analysis of move 16...?).

Earlier, instead of 7...b5 8. cxb5 ± (+0.75 @ 25 ply, Stockfish 8), our Opening Explorer indicates Black has had more success with the popular move 7...e6 = (+0.16 @ 27 ply, Stockfish 8) as in Black's win in Ponomariov vs Topalov, 2007.

Jul-11-18  saturn2: I saw after 40 RexB black is helpless.
Jul-11-18  Imran Iskandar: Wednesday puzzles are, I think, normally harder than this, but I'm not complaining.
Jul-11-18  landshark: For a while I thought 39....Re7 would save Black but I think it only delays the inevitable. White plays 40.Kd2 and if ....Kf7 then 41.R3xB, RxR 42.a7 queens, or 41... NxR 42.Rb7, Nc7 43.a7 Na8 44.RxR,KxR 45.Ke3 looks like a win because Black's c-pawn will fall and White will gobble up the remaining black pawns while Black has to go capture the a-pawn. Strong R activity!
Premium Chessgames Member
  messachess: Very easy, and easy to see.
Jul-11-18  Mayankk: Simple enough. Once you notice that the Knight is overworked, saving the key b7 square from Rb7 and a potential pawn promotion as well as the Bishop on e6, the answer is obvious.

The only other calculation you have to do is that the Knight, once on e6, canít reach the crucial b8 square in time to prevent the pawn from queening.

Jul-11-18  AlicesKnight: A nice tactical point. 40.Rexe6 should create enough advantage. If ...Nxe6 then 41.Rb7+ either gains the R or allows the a-pawn to queen (after exchange of Rs). Otherwise a longer win with material and positional advantage.
Jul-11-18  newzild: Similar to <Patzer2>'s failed try, my first thought was 40. Rc6, apparently winning a minor piece.

However, a second glance showed that 40. Rc6 Nd3 41. R(either)xe6 loses to 41...Nf4+.

Only then did I see the game continuation.

Jul-11-18  WorstPlayerEver: Net als gisteren.
Jul-11-18  lentil: The same position with no P/c3 would be a nice spoiler !
Jul-11-18  Cheapo by the Dozen: This one came easily to me too, roughly along the lines:

-- This isn't about mate; it's about material.
-- Material starts out pretty even.
-- Pawn promotion is obviously key.
-- Can we divert the knight?

Jul-11-18  leRevenant: As per <sjunto:> except that I would have preferred Belgium to beat France in the semi-final.
Premium Chessgames Member
  takchess: Happy Pawn promotion Wednesday R3e6 followed by Rb7 and axb7 wins the game.
Jul-11-18  et1: as easy as beutiful
Jul-11-18  Whitehat1963: I donít usually get Wednesday puzzles in a flash. For some reason, I took too long yesterday. So, not your usual Wednesday difficulty. Letís see what we get tomorrow.
Premium Chessgames Member
  malt: The Bounder is after the 'a' pawn,
40.Re:e6 Nd7 (40...N:e6 41.Rb7+ )
Jul-11-18  zb2cr: The good old visualization device of the "square of the Pawn" to determine whether the Black King is able to stop the Pawn, plus the Black Knight at e6 being overworked, leads to 40. Rexe6, winning decisive material.
Jul-11-18  mel gibson: Very easy today.
Premium Chessgames Member
  morfishine: The ole one-two: <40.Rexe6> 40...Nxe6 and now <41.Rb7+> and White wins
Premium Chessgames Member
  patzer2: Late in the game, Black misses a chance to hold the draw with 37...Rxb6 =.

White makes a mistake with 37. Rb6?, but Black fails to punish it with 37...Rxb6 38. axb6 Nd7 = (0.00 @ 51 ply, Stockfish 9 analysis of move 37...?).

Instead of 37...Rxb6 38. axb6 Nd7 =, Black plays 37...Rc7? and White gets back on the winning track with 38. a6 +- (+4.32 @ 32 ply, Stockfish 8).

Instead of offering to trade down material with 37. Rb6?, potentially allowing 37...Rxb6 38. axb6 Nd7 =, White should have maintained the tension with 37. Kg6 ± to +- (+ 1.82 @ 36 ply, Stockfish 9 analysis of move 37.?).

Jul-11-18  TheTamale: Holy cannoli, not only did I get a Wed. puzzle, but I got it almost instantly. I know for most this is no big feat, but for me a M/T/W trifecta is the exception.
Jul-11-18  Strelets: Cox brings home the full point with an unexpected sacrifice of the exchange. 40.Rexe6! (the b-rook has other plans) Nxe6 41.Rb7+ and Black is forced to resign due to either the promotion of the a-pawn or loss of the rook on a7. It's easy to get the impression that endgames are all technical grinding, but they're bursting with tactical opportunities if you know where to look.
Premium Chessgames Member
  CHESSTTCAMPS: In this endgame, white has a R plus 2 pawns for N+B, which might be assessed as a rough material equality. In fact, white has an easy win, but it's quite possible to fall into the trap of trying to remove the guard, e.g. 40.Re5? Rxa6 41.R5xe6?? Ra2+ 42.K moves Nxe6 is winning for black. Similarly bad is 40.Rc6? Nd3 41.R (either)xe6?? Nf4+ followed by Nxe6.

Instead, white can play 40.R3xe6! Nxe6 (Nd7 41.Rxg6 looks simplest) 41.Rb7+ Nxb7 42.ab and the pawn promotes.

Jul-11-18  PJs Studio: I quickly chose the far worse Rb5. After Nd7! Rb7 isnít check and black likely wins after Rxa7
Premium Chessgames Member
  Breunor: I felt bad for missing yesterday which seems easy at least in retrospect, but I got this one right away!
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