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Lucas van Foreest vs Jinshi Bai
54th Groningen Open (2016), Groningen NED, rd 5, Dec-26
Sicilian Defense: Old Sicilian. General (B30)  ·  0-1
ANALYSIS [x]

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Kibitzer's Corner
May-15-17
Premium Chessgames Member
  Phony Benoni: Looking at the checks, we see that 39. ..Rd3+ is foiled by a bishop interposition. So how about eliminating the bishop?

<39. .Rxf2 40.Rxf3 Rd3+ 41.Nf3 Rxf3+ 42.Rxf3 Bxf3>, and Black's a piece up with no worries.

May-15-17
Premium Chessgames Member
  lost in space: Aha, it is Monday again!

39...Rxf2 (eliminating the most important defender) 40. Rxf2 Rd3+ 41. Nf3 (or Rf3) Rxf3+ 42. Rxf3 (or Nxf3) Bxf3 wqith a won endgame (a piece up)

May-15-17  Strelets: I spent longer than I care to admit trying to find a forced win before settling for a won ending with an extra bishop. The point? Don't waste too much time looking for something that isn't there.
May-15-17  Walter Glattke: 39.-Rd3+? 40.Bg3! not 40.Be3.
May-15-17
Premium Chessgames Member
  Nf3em: Too easy: 39... Rxf2 40.Rxf2 Rd3+ and after exchanges in f3-square, Black will be a piece-up and win the game eventually.
May-15-17
Premium Chessgames Member
  ChessHigherCat: I wouldn't say it was tweasy for a Monday. I hesitated before choosing Rxf2 because I thought "Damn, Rd3+ doesn't lead to mate now!" but in these puzzles winning a piece is enough, much like modern diplomacy, where winning the peace is just as important as winning the war.
May-15-17
Premium Chessgames Member
  agb2002: Black has a rook for a knight and a pawn.

The white king lacks mobility and 39... Rd3+ is met with 40.Bg3. Therefore, 40... Rxf2 41.Rxf2 Rd3+ 42.Nf3 (42.Rf3 Bxf3 is even worse) 42... Rxf3+ 43.Rxf3 Rxf3+ wins a piece.

May-15-17
Premium Chessgames Member
  An Englishman: Good Evening: Really nice illustration of how to sustain a pawn-down initiative after the exchange of Queens. The combination at the end was just a nice little flourish.
May-15-17  AlicesKnight: All the pieces bar one (for Black) can be exchanged off by ... Rxf2 followed by ...Rd3+, thanks to the self-blocking around the White K.
May-15-17  Iwer Sonsch: 39...Rxf2 40.Rxf2 Rd3+ wins material. No mate this time.
May-15-17  saturn2: Black is up an exchange but down a pawn.
39 ..RxB and white has only one piece to interpose after 40..Rd3+
May-15-17
Premium Chessgames Member
  patzer2: Here's my look at today's Monday puzzle (32...?) and game with the chessgames.com opening explorer, Deep Fritz 15, Stockfish 8 and others:

<1. e4 c5 2. Nf3 Nc6 3. c3 d5 4. exd5 Qxd5 5. d4 Bf5 6. dxc5 !?> I suppose this is playable and with perfect play might be good for equality, but in seeking an advantage for White I prefer the popular move 6. Be3 to = (+0.45 @ 27 depth, Houdini 5.01 x 64) as in White's win in M Vachier-Lagrave vs D Daulyte, 2017)

<6... Qxd1+ 7. Kxd1 O-O-O+ 8. Ke1> Of the five games in the chessgames.com opening explorer after the forcing moves 6...Qxd1+ 7. Kxd1 0-0-0+ 8. Ke1, Black won four and drew one.

If these practical results are any guide, 6. dxc5!? should perhaps be avoided in serious play -- even though 6. dxc5!? does look like a fun try for skittles and blitz.

<8...Nf6 9. b4> Here the computers recommend 9. Bb5 e5 10. Be3 Nd5 = (0.00 @ 34 depth, Komodo 10) as in Black's win in D Spence vs M Sebag, 2014.

<9... Nd5 10. Bd2 e5 11. Na3?!> This turns the game in Black's favor after 11...a5 (-0.37 @ 33 depth, Stockfish 8.)

Instead, White can hold it level with 11. Be2 = (-0.14 @ 31 depth, Komodo 10.3)

<11... a5 12. Nh4 Be6 13. Nc2 e4 14. g3 Be7 15. Rc1?> This loses because it allows 15...Ne5 (-1.88 @ 27 depth, Komdo 10.3)

Instead, Black can still fight on with hope for a draw after 15. bxa5 Bxc5 (-0.74 @ 28 depth, Stockfish 8)

<15... Ne5 16. Be2 Bh3> (-2.25 @ 31 depth, Stockfish 8) White's position is hopelessly lost.

<17. Ne3 Nxe3 18. Bxe3 g5> This works out fine for Black, but even stronger here is 18... axb4 19. Rb1 g5 (-2.43 @ 30 depth, Stockfish 080417)

<19. f4 Nd3+ 20. Bxd3 Rxd3 21. Bd4 Rd8 22. fxg5 Bxg5 23. Rb1 axb4 24. Rxb4 Bg4 25. Rb1 Bd2+ 26. Kf2 e3+ 27. Kg2 e2 28. Bf2 Be6 29. Rhg1 Bd5+ 30. Kh3 Be6+ 31. Kg2 Bxc3 32. Rbc1 Bd5+ 33. Kh3 Be6+ 34. Kg2 Bd5+ 35. Kh3 Rd1 36. g4 Bc6 37. Rxc3 Rxg1 38. Re3 Rf1 39. Rxe2 Rxf2! 0-1> This solves the Monday May 15, 2017 chessgames.com puzzle. White resigns in lieu of 40. Rxf2 Rd3+ 41. Nf3 Rxf3+ 42. Kg2 Rxf2+ 43. Kxf2 Kd7 (-6.66 @ 23 depth, Deep Fritz 15)

May-15-17
Premium Chessgames Member
  patzer2: Appears to me 39...Rxf2! utilizes at least three tactical themes:

1) Removing the guard by capturing the Bishop, in order to avoid 39...Rd3+ 40. Bg3 with a much more difficult winning continuation for Black.

2) Forcing a piece to f3 (decoy tactic) after 39...Rxf2 40. Rxf2 Rd3+ .

3) Overloading of pieces by forcing a two on one capture sequence after 39...Rxf2 40. Rxf2 Rd3+ 41. Nf3 Rxf3+ .

May-15-17  leRevenant: <Nf3em: Too easy:> Too easy? Do you know what day of the week this is?
May-15-17  Cheapo by the Dozen: Too loose for a mate, but White is sufficiently netted to lose material.
May-15-17  morfishine: <39...Rxf2> followed by <40...Rd3+> wins

*****

May-15-17  et1: not Too Easy but Easy. Too Easy is the usual Queen sac. Spent a lot of time checking for something better before settling for the obvious R takes B
May-15-17  Iwer Sonsch: <patzer2> White's knight moves to the rim were simply dim. By 11.Na3!? and 12.Nh4!?, White went from an almost equal -0.14 (depth 33) down to -0.73 (depth 27).

Even though Black's advantage would have already been decisive after 15.Rc1? Ne5! in a grandmaster-level game, Black's edge drastically increased after 19.f4? Nd3+! 20.Bxd3 Rxd3 (-4.22 @depth 23).

Instead, White could have put up more resistance with 19.Bd4! Bf6 20.f4 gxf4! (-1.84 @depth 26).

In the game line, Black could have manifested his advantage by playing 24...Rd2!


click for larger view

For example, 25.Ra4 Rc2 26.Ra8+ Kc7 27.Rxd8 Kxd8 28.Rg1 Rxa2 (-6.25 @depth 24).

May-15-17  mel gibson: I was looking for a checkmate but it boils down to a winning end game. The computer says:

39. Rxe2 Rxf2 (39. .. Rxf2 (♖f1xf2 ♖e2xf2 ♖d8-d3+ ♘h4-f3 ♗c6xf3 ♔h3-g3 ♗f3-d5+ ♔g3-h4 ♔c8-c7 ♔h4-g5 ♔c7-c6 h2-h4 ♖d3-d4 h4-h5 ♗d5-e6 ♖f2-g2 ♔c6xc5 a2-a3 f7-f6+ ♔g5xf6 ♖d4xg4 ♖g2-e2 ♗e6-d5 ♖e2-e8 ♖g4-g3 ♖e8-c8+ ♔c5-d4 ♖c8-h8 ♗d5-g8 ♔f6-f5 b7-b5) +3.50/23 99)

blacks score +3.50 depth 23

May-15-17
Premium Chessgames Member
  gawain: Unusual for a Monday: no checkmate, and not even the outright win of a major piece. But a nice little combination, all the same.
May-15-17
Premium Chessgames Member
  patzer2: <Iwer Sonsch> Thanks for the excellent analysis of 19. f4?! and 24...Rd2!

As you observe, positions such as those after Black's 18th move here -- which look easy to win with GM technique or computer analysis -- are not so easy to win over the board.

As Lasker said "The hardest game to win is a won game."

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