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David Berczes vs Gokhan Kursuz
European Club Cup (2007), Kemer TUR, rd 3, Oct-05
Torre Attack: Fianchetto Defense (A48)  ·  1-0

ANALYSIS [x]

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Kibitzer's Corner
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May-20-17  ozmikey: I worked it out differently - 25.Qd8+ Rxd8 26.Rxd8+ Bf8 27.Rxf8+ Kg7 28.Rg8+ Kh6 29.Bf4+ g5 30.Nxg5 with mate coming on either g5 or f7 (30...Ne2+ 31.Kh2 changes little). But the game continuation sac'ing the rook on f8 is much nicer.
May-20-17  Morphys Law: This one seemed much easier than yesterday's.
May-20-17  kungfufighter888: ya white should win by 28 Rg8+
May-20-17
Premium Chessgames Member
  agb2002: White has a rook, a bishop and a pawn for a knight.

Black threatens Nxd5, Nxd1 and Nxe6.

A slow path to victory seems to be 25.Bxc8 Nxd5 26.Rxd5 but White has 25.Qd8+ Rxd8 (25... Bf8 26.Qxc8, etc.) 26.Rxd8+ Bf8 27.Rxf8+ Kg7 28.exf6+:

A) 28... Kxf8 29.Bd6+ Ke8 30.f7+ Kd8 31.f8=Q(R)#.

B) 28... Kh6 29.Bf4+ Qxf4 (29... g5 30.Bxg5+ Kg6 31.Rg8# or 31.Bf5(7)#) 30.exf4 Nxe6 (+ - [2R+2P vs n]) 31.g5+ Kh5 32.Rh8 wins.

May-20-17  Walter Glattke: Don't forget, that 30.Nh4 above threatens 31.Nf5# - Play 28.Rg8+, please.
May-20-17  claudi: I admit that 25.Qd8+ is a very interesting move.
May-20-17  Walter Glattke: Ah, CG get mating with 28.gxf6 Kh6
29.g5+! Kh6 30.Rh8 or the moon kibitzer with 28.-Kxf8 29.Bd6+ Ke8 30.f7+ Kd8 31.f8R or Q# 28.Rg8+ last a little bit longer then.
May-20-17  goodevans: Is it Monday already?
May-20-17  Iwer Sonsch: Very difficult???

White is up an entire rook (and a pawn).

25.Qd8+ Rxd8 (25...Bf8 26.Qxf8 wins a Knight) 26.Rxd8+ Bf8 27.Rxf8+ (White is still 5 points up in material) Kg7 28.Rg8+ Kh6 29.Bf4+ g5 (29...Qxf4 resigns) 30.Bxg5+ fxg5 31.Nxg5 and 32.Nf7#.

So what is very difficult about this?

May-20-17  Iwer Sonsch: So the challenge was to find the quick mate - which White even missed in the game with 31.Rc8!? (+17.91 @depth 24).

The fastest mating moves are, as annotated, 29.g5+! Kh6 30.Rh8 and 33.Rxg7#.

My line is mate in 10 after 29...Qxf4 30.exf4.

25...Bf8 is mate in 4 after 26.Qxf6+!, but 26.Qxc8 Nxe6 27.Qxe6 also wins (22.61 @depth 23).

Black's decisive mistake was the overly aggressive 19...Rc8?, allowing the counterattack with 20.dxe5!, pinning Black's D pawn to the queen (20...fxe5? Qxe4! 4.62 @depth 21).

Instead, Black could have kept it equal with 19...Qxb4! 20.Rab1 Qf8! 21.dxe5 fxe5 (0.20 @depth 25).

After 21...Ndc5?! 22.Qxd5+, Black was completely lost (4.24 @depth 25). He could have fought on after 21...Nb6! 22.Bxe8 Rxe8 (1.64 @depth 24).

May-20-17  Iwer Sonsch: Out of the 41 possible moves (if I didn't overlook one), 16 are winning, 3 are losing, 12 are equalizing, and the other 10 leave White with an advantage.

<al wazir> Your line is winning up to 28.g5? Nxe6 (0.68 @depth 24). Instead, the simple 28.Bxc8! (10.42 @depth 22) makes this one of the strongest non-Qd8+!-lines.

May-20-17  Iwer Sonsch: <Cheapo by the Dozen> Perfect Monday-style solution for this Tuesday puzzle.
May-20-17  patzer2: Here's a look at today's Saturday puzzle (25. ?) and game with the chessgames.com opening explorer (OE), Stockfish 8, Deep Fritz 15 and Houdini 5.01:

<1. Nf3 Nf6 2. d4 g6 3. Bg5 Bg7 4. c3> This quiet opening move has decent winning results (36.5% wins vs 25.8% losses out of 422 games in the OE) and is the second most popular.

Most often played is 4. Nbd2 = (0.00 @ 36 depth, Houdini 5.01 x 64) as in White's win in B Sambuev vs Fishbein, 2017 or Black's win in E Torre vs G Jones, 2017.

<4...O-O 5. Nbd2 d5 6. e3 c6> The computers evaluate 6...c6 as level, but this seldom played move has not been good for Black. Of 21 games with 6...c6 in the OE, White won 10 and Black won one.

The popular move and my preference is 6...Nbd7 as in the draw in Kramnik vs Radjabov, 2017.

<7. Be2> This is good, but also playable is 7. Bd3 as in White's win in Balashov vs Gufeld, 1975 or Black's win in A Saric vs T Grzincic, 2001.

<7...Bg4> This is OK, but slightly better IMO is 7...Bf5 as in Black's wins in O Yaksin vs D Baramidze, 2007 and Kamsky vs M Vachier-Lagrave, 2013.

<8. h3 Bxf3 9. Nxf3> We appear to leave opening theory, as this is the only game with this move in the OE.

Equally strong is 9. Bxf3 as in White's win in Khenkin vs Zaur Bayramov, 2017.

<9. Nbd7 10. O-O Re8 11. Bf4 Ne4 12. Bh2 e5 13. g4 Qa5 14. Qc2 Rad8 15. b4 Qc7 16. c4 Qd6 17. cxd5 cxd5 => Up to now, Black has done well holding it level against a much stronger opponent.

<18. Bb5 f6?!> This is not too bad, as Black may be able to survive with only a slight disadvantage after 19. dxe5 Qxb4 20. Rab1 Qf8 21. e6! (+0.56 @ 32 depth, Stockfish 8.)

The main point of being critical of 18...f6>?! is there's a much better move available. Instead of 18...f6?, Black should play 18... Rc8 19. Qb2 h5 20. Nxe5 Nxe5 21. f3! Nc4! 22. Bxc4 Ng3!23. Qf2 Rxc4 24. Bxg3 Qxb4 = to (-0.33 @ 33 depth, Stockfish 8) with a good game.

<19. Rfd1!> This is a good move, which becomes an excellent move when Black takes the bait and plays 19...Rc8? to take the "open file."

An equally good or better option for White might be the above mentioned computer suggestion 19. dxe5 Qxb4 20. Rab1 Qf8 21. e6! (+0.56 @ 32 depth, Stockfish 8.)

<19... Rc8?> Allowing 20. dxe5 Qxb4 21. Qd3 to (+1.92 @ 30 depth, Stockfish 8), this seems to be the losing move.

Instead, Black should play 19... Qxb4 20. Rab1 Qf8 21. dxe5 fxe5 22. Kg2 Ndc5 23. Bxe8 Qxe8 24. Qb2 b6 25. Bxe5 Na4 26. Qd4 Bxe5 27. Nxe5 Nac3 28. Rbc1 Nxd1 29. Rxd1 Qb5 30. g5 Qc5 31. h4 (+045 @ 32 depth, Stockfish 8) with only a small edge for White.

<20. dxe5 Qxb4 21. Qd3 Ndc5 22. Qxd5+ Re6 23. Bd7 Nc3 24. Bxe6+ Kh8 25. Qd8+!!> This solves the Saturday May 20, 2017 chessgames.com puzzle.

<25...Rxd8 26. Rxd8+ Bf8 27. Rxf8+ Kg7 28. exf6+!> With best play, 28. exf6+! yields mate-in-six.

My winning try was 28. Rf7+ Kh6 29. Bf4+ g5 30. Bf5 Ne2+ 31. Kh2 Qxf4+ 32. exf4 gxf4 33. Rxh7#.

Another strong winning option is 28. Rg8+ Kh6 29. Bf4+ g5 30. Nxg5 Ne2+ (30... fxg5 31. Bxg5#) 31. Kh2 Qxf4+ 32. exf4 Nxe6 33. Nf7#.

<28... Kh6> If 28... Kxf8, it's mate-in-three after 29. Bd6+ Ke8 30. f7+ Kd8 31. f8=Q#

<29. Bf4+> This wins, but even faster is mate-in-five with 29. g5+ Kh5 30. Rh8 Ne2+ 31. Kg2 Nf4+ 32. Bxf4 Nxe6 33. Rxh7#.

<29... Qxf4 30. exf4 Nxe6 31. Rc8 1-0> Black resigns.

It's mate-in-nine after 31...Ne2+ 32. Kh2 N2xf4 33. Re1 b6 34. Re5 a6 35. g5+ Nxg5 36. Nxg5 Kh5 37. Nf7+ Kh4 38. Rc4 g5 39. Rxg5 b5 40. Rxf4# (Deep Fritz 15 @ 23 depth).

May-20-17
Premium Chessgames Member
  malt: 25.Qd8+ R:d8 26.R:d8+ Bf8 27.R:f8+ Kg7 28.ef6+ K:f8 29.Bd6+ Ke8 30.f7+
May-20-17  RandomVisitor: After 18.Bb5 <Rc8>


click for larger view

Komodo-10.1-64bit: <7 hours computer time>

-0.35/40 19.Qe2 Nc3 20.Qd3 Nxb5 21.Qxb5 a6 22.Qd3 Qxb4 23.Rab1 Qe7 24.Bxe5 b5 25.a4 bxa4 26.Bxg7 Kxg7 27.Qxa6 Ra8 28.Qc6 a3 29.Qxd5 a2 30.Rb7 a1Q 31.Rxd7 Qa5 32.Qxa5 Qxd7 33.Qc3 Qd5 34.Nd2 h5 35.e4 Qg5 36.f4 Qa5 37.Qxa5 Rxa5 38.gxh5 Ra2 39.Rf2 gxh5 40.Kg2 Kf6 41.Kg3 Rc8 42.Nf3 Rxf2 43.Kxf2 Ke6 44.f5+ Kd6 45.Ke3 Rc3+

May-20-17  morfishine: Puzzle position seems a bit timid for a Saturday. Straight forward and obvious is <25.Qd8+> which nets White a winning position after all the exchanges. White can do this because he's already up an exchange

*****

May-20-17  clement41: Given the material imbalance in the puzzle position, you need very basic calcs to understd that sacking the Q is OK. 1 Qd8+ Rxd8 (...Bf8 2) Qxc8 )
2 Rxd8+ Bf8 forced
3 Rxf8+ Kg7 and here two lines mainly

I 4 Rg8+ perhaps the most natural Kh6
5 Bf4+ Qxf4 (...g5 6 Nxg5 looks (eg 6...fxg5 7 Bxg5#; 6...Nxe6 Nf7#) 6 ef Nxe6

II 4 ef+! Kh6 (...Kxf8?? 5 Bd6+ Ke8 6 f7+ Kd8 7 f8=R#) 5 g5+ Kh5 (game line works too, like many moves: 5 Bf4+ Qxf4 (...g5?? 6 Bxg5+ Kg6 7 Bf7# an original net!) 6 Bg4+ Qxg4
7 hg+ Kxg4 with an even greater material imbalance

May-20-17
Premium Chessgames Member
  thegoodanarchist: Another puzzle from a 2007 game!
May-20-17  patzer2: <Random Visitor> Thanks for the deep analysis of the Black improvement 18...Rc8 to =.

One interesting aspect of this game is that taking the open file with 18...Rc8 is really good for Black, but waiting to take it a move later after <18...f6?! 19. Rfd1 Rc8?> is really bad. So bad, in fact, that 19...Rc8? is practically Black's losing move.

May-20-17  morfishine: Black played some really suspect, weak and pathetic moves leading up to this debacle, (now that I've gone over the entire game)

*****

May-20-17  morfishine: Have to admit <28.exf6+> was truly lovely

*****

May-20-17  Iwer Sonsch: <al wazir> 1.72 @depth 39, which means it is probably still winning if a GM takes over your game.
May-20-17
Premium Chessgames Member
  Willem Wallekers: Finally a saturday I love.
May-20-17  patzer2: I was curious as to why 18...Rc8 is so good and 19...Rc8? is so bad.

So I plugged it into Stockfish 8 and soon realized the strong 18...Rc8 works because 19. dxe5? now fails due to the unobstructed Bishop on g7.

After 18...Rc8 19. dxe5? Black wins with 19...Nxe5 20. Bxe5 Bxe5 (-3.07 @ 32 depth, Stockfish 8


click for larger view

due to the dual threat 21. Bxa8 or 21. Rxc2.

Instead, with 18...f6?! Black blockades his strong Bishop on g7, and after the successful trap 19. Rd1 Rc8? White is practically winning with 20. dxe5! (+2.23 @ 31 depth, Stockfish 8.)

P.S.: A lesson learned might be to not make dubious pawn moves (e.g. 18...f6?!) which get in the way of your own pieces coordination.

May-20-17
Premium Chessgames Member
  drollere: i agree, this is a tuesday puzzle. took me about one minute to confirm 25. Qd8 with the R following and the advancing pawn.

i didn't see an analysis of 28. Rg8+ before the pawn capture, but the 2 B mating net that follows 28. ... Kxf8 is pretty.

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