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| Feb-05-06 | | kevin86: A problematic finish:black guarded the seventh row with his rook-but blocked his bishop's coverage of f8,right after said bishop vacated the square for that exact purpose! |
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Feb-05-06
 | | pittpanther: If 29 ... Kxh7 30. g6+ Kg8 31. Rxf7 Rxf7 32. Rxf7 Qxf7 33. gf+ Kxf7 Black has a rook and bishop for the queen. I think white is better but not immediately won. in fact, if black throws in a Bc5+ intermezzo that would help his position a bit. Am I missing something? Thoughts? |
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| Feb-06-06 | | patzer2: White's 27. Bxe5!! prepares a decisive demolition of pawn struture combination, with the sham sacrfice offers 28. Nf6+! and 29. Nxh7! to follow. |
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Dec-27-12
 | | perfidious: <vizir: please can someone explain me the 14.g4 ? What about 14...d5 ?
Doesnt an appropriate reaction on the center would refute the smyslov's idea which appears to me too optimistic ?> The snag with 14....d5 is that after 15.e5, the position is converted to a French structure where Black has exchanged with ....cxd4, but obtained insufficient play to compensate for releasing the central tension. In this form, he lacks even the typical French lever ....f6 because of the weakness at e6, so the resulting position is clearly better for White, who will build up a kingside attack. |
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Jun-21-15
 | | Penguincw: Oops, guessed Nf6+ Kh8 Nxh7 a move too early. :p At least I can look forward to tomorrow... Anyway, like I mentioned on the <GOTD> page, I feel bad for Hort, being on the losing side of the GOTD and POTD. :p |
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| Jun-21-15 | | paramount: Not so hard for the sunday puzzle!! |
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| Jun-21-15 | | abuzic: 27.Nf6+ Kh8 28.Nxh7 Kxh7 29.Bxe5 Rxe5 30.Qh3+ <this is stronger the other options> Kg8 31.Rxf7 |
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| Jun-21-15 | | M.Hassan: "Insane"
White to play 27.?
Each side has lost two pawns
27.Nf6+
A)
27...........gxf6
28.gxf6+(disc.) Kh8
29.fxe7 Qxe7
White falls ahead by a Rook for a Knight, worthed
B)
27..........Kh8
28.Nd5 Nxd5
29.Nxd5 Bxd5
30.exd5 Qc4
31.Qh3 Rb8
32.Rf4 Qxc2
33.Be4 Nf3+ out of desparation
34.Qxf3 Qxa4
White falls ahead by a Bishop for two pawns plus having an outstanding position.
Time to review
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My line is quite different but as far as I can see, there is nothing wrong with it. Any comments? |
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Jun-21-15
 | | Fusilli: <perfidious: <vizir ... What about 14...d5 ?> The snag with 14....d5 is that after 15.e5, the position is converted to a French structure where Black has exchanged with ....cxd4, but obtained insufficient play to compensate for releasing the central tension.> I made that mistake against GM Becerra, and as <perfidious> indicates, soon found myself in a passive position with no chance of counterplay: J Becerra Rivero vs M Sana, 2004. |
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| Jun-21-15 | | morfishine: I too started with <27.Nf6+> not even considering 27.Bxe5 Nice posts <abuzic> & <M.Hassan> ***** |
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| Jun-21-15 | | wooden nickel: I was convinced that this was a choice between 2 knight sacs with check as in various past puzzles during the week.
The line 27.Nh6+ doesn't look too ambitious and might only lead to a draw:
27.Nh6+ gxh6 28.Bxe5 dxe5 29.gxh6+ Kh8 30.Qg5
click for larger view
The line 27.Nf6+ was screaming to be played, because 27... gxNf6 loses for Black.
On 27...Kh8 White could try another knight sac 28.Nxh7.
28... Kxh7 29.Bxe5 Rxe5 30.Qh3+ Kg8 31.Rxf7
click for larger view
The played line 27.BxNe5 took me by surprise in this game with a couple of my favorite top world players! |
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| Jun-21-15 | | Patriot: My line went: 27.Bxe5 dxe5 28.Nf6+ Kh8 29.Nxh7 Kxh7 30.g6+ fxg6 31.Rxf8 Rxf8 with mate threats. It took a long time to decide on 27.Bxe5, as opposed to 27.Nf6+. The key move seemed to be eliminating the knight first in order to meet 29...Kxh7 with 30.g6+. But I haven't double-checked this with a computer. |
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| Jun-21-15 | | RandomVisitor: After 21.Nf3 black likely had equal chances:
click for larger viewRybka 4.1 x64:
<[+0.13] d=23 21...Rcd8> 22.Nh4 g6 23.a5 Qc7 24.f5 Ne5 25.axb6 Qxb6 26.b3 Qb4 27.Bd2 Qb6 28.f6 Nc6 29.Be3 Qb4 30.Bd2 Nd4 31.Ne2 Nxe2+ |
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| Jun-21-15 | | patzer2: <1. e4 c5 2. Nf3 e6 3. d4 cxd4 4. Nxd4 Nf6 5. Nc3 d6 6. Be2 Be7 7. O-O a6 8. f4 O-O 9. Be3 Qc7> The most popular move and my preference is 9... Nc6 as in the Super GM game M Vachier-Lagrave vs Van Wely, 2015. Of course Black can transpose back to this 9...Nc6 line in this game after 10. a4 Nc6 =. <10. a4 b6> Here I prefer the popular move 10... Nc6 as in Black's win in N Pogonina vs Ivanchuk, 2014.
According to the chessgames.com opening explorer (OE), 10...Nc6 has been played in 918 games while 10...b6 has been played in only 61 games. <11. Bf3 Bb7 12. Qe1 Nbd7 13. Bf2 Rac8> This is where theory based on practice ends as this the only game with this move in the OE database. Even though the line is not popular, I suppose it's OK as the computer assesses the position after 13...Rac8=(-0.09 @ 21 depth, Deep Fritz 14) as equal. Perhaps another worthy alternative is 13...g6 = as in Black's win in
J Kalish vs G Sanakoev, 1978, <14. g4 Nc5 15. g5 Nfd7 16. Rd1 Nb8 17. Be3 Nc6 18. Qg3 Rfe8 19. Bg2 Bf8> Here Fritz prefers a more active counter with 19... Nb4 when play might continue 20. Qh4 d5 21. e5 (21. exd5 Nxd5 22. Bxd5 Bxd5 23. Nxd5 exd5  ) 21... g6 22. Bh3 Bf8 23. Rf3 Ne4 24. Bg4 h5 25. gxh6 Qe7 26. Qxe7 Rxe7 27. Nxe4 dxe4 28. Rh3 Nd5 29. Bc1 Kh7 30. Be2 Rd7 31. Kf1 Rcd8 32. c3 Bc5 33. Ke1 Nb4 34. Be3 Bxd4 35. cxb4 Bxe3 36. Rxe3 Rxd1+ 37. Bxd1 Kxh6 38. Rc3 Rd7 39. h4 = (-0.02 @ 22 depth, Deep Fritz 14). <20. Rf2 Qd7 21. Nf3 Nb4 22. Ne5 Qc7 23. Ng4 Nd7 24. Bd4 e5 25. fxe5
Nxe5 26. Rdf1 Re7?> This is the decisive error. Instead Black should play 26... Nxg4 27. Qxg4 Re7 28. Qh4 Rce8 29. Rd2  (+0.55 @ 21 depth, Deep Fritz 14), when White has an advantage but Black has active counterplay and drawing chances. <27. Bxe5!> This solves today's Sunday puzzle. My attempt was 27. Nf6+ which also wins after 27...Kh8 (28... gxf6 29. gxf6+ Kh8 30. fxe7  ) 28. Nxh7 Kxh7 29. Bxe5! Rxe5 30. Qh3+ Kg8 31. Rxf7 Qxf7 (31...Qc6 32. g6 ) 32. Rxf7 Kxf7 33. Qd7+ Re7 34. Qf5+ Ke8 35. Bf3! (+4.98 @ 25 depth, Deep Fritz 14). <27... dxe5 28. Nf6+ Kh8> If 28... gxf6, then 29. gxf6+ Kh8 30. fxe7 (+11.56 @ 20 depth). <29. Nxh7 Re6>
If 29... Kxh7, then 30. g6+ fxg6 (30... Kg8 31. Rxf7 Rxf7 32. gxf7+ Kh7 33. Qh4+ Kg6 34. Rf5 ) 31. Rxf8 (+ 15.24 @ 22 depth, Deep Fritz 14) <30. Rxf7 Bc5+ 31. Kh1 Re7 32. Rf8+ 1-0> Black resigns in lieu of 32...Rxf8 33. Rxf8+ Kxh7 34. g6+! Kh6 35. Rh8#. P.S. Though I found the first couple of moves of an alternative win with 27. Nf6+!, I didn't see all the follow-up needed to assure the win. So no points or me on this Sunday puzzle. |
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| Jun-21-15 | | BOSTER: Better was to ignore the thteat Rxf7, and play
26...Nxg4. If 27 Rxf7 Qc4 with tempo. |
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| Jun-21-15 | | CHESSTTCAMPS: Material is even, with all major and minor pieces on the board. White enjoys a space advantage, with the advanced g5 pawn and the rook battery on the c-file. Also, the black king is lightly defended, with h7 defended only once. It seems that White can start an invasion with a free shot that directly attacks weak h7. 27.Nf6+!
A) 27... gxf6 28.gf6+ Ng6 (Kh8? 29.fxe7 Qxe7 30.Rxf7 is even worse) 29.fxe7 Qxe7 (Bxe7 30.Rxf7) 30.Bxb6 (R+P for a knight) B) 27... Kh8 28.Qh4 and now:
B.1) 28... gxf6 29.gxf6 Re6 30.Rf5 Qc4 (Qd8? 31.Rh5 Rxf6 32.Rxh7+ Kg8 33.Rh8+ Kg7 34.Qh7#) 33.Rh5! Qxd4+ 34.Kh1 h6 (there is no defense to Rh7+) 35.Rxh6+ Bxh6 36.Qxh6+ Kg8 37.Qg7# B.2) 28... h6 29.gxh6 gxf6 30.Rxf6 (threatening Qh5 followed by Rxf7) Qc4
31.Rxd6 and white has 3 pawn for the piece with powerful threats of Rf5 and Qh5 B.2.1) 30... N4c6 31.Nd5 Qd8 (Qd7 32.Bh3) 32.Bxb6 Qe8 33.Nxe7 with 4 pawns for piece and ongoing initiative. Time for review.... |
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| Jun-21-15 | | CHESSTTCAMPS: There seem to be several good options for white. I'll review later to see if my lines have a big hole. |
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| Jun-21-15 | | agb2002: The material is identical.
A first idea was 27.Bxe5 dxe5 28.Nh6+ gxh6 29.gxh6+ Kh8 but seems to stagnate. Another option is 27.Nf6+ Kh8 (27... gxf6 28.gxf6+ wins the exchange) 28.Qh3: A) 28... gxf6 29.gxf6
A.1) 29... Re6 30.Rf5
A.1.a) 30... Nxc2 31.Rh5
A.1.a.i) 31... Nxd4 (or 31... Rxf6) 32.Rxh7+ Kg8 33.Rh8+ Kg7 34.Qh7#. A.1.a.ii) 31... h6 32.Rxh6+ Bxh6 (32... Rg8 33.Rh8#) 33.Qxh6+ Kg8 34.Qxg7# A.1.a.iii) 31... Ng6 32.Rxh7+ Kg8 33.Rff5 Nxd4 34.Rfh5 Rxf6 35.Rh8+ and mate in two. A.1.b) 30... Ng6 31.Rh5 with the same idea as in A.1.a. B) 28... h6 29.gxh6
B.1) 29... gxh6 30.Be3
B.1.a) 30... Kh7 31.Nd5 Nxd5 32.exd5 and the threat 33.Be4+ looks winning. B.1.b) 30... Bg7 31.Bxh6 Bxf6 32.Bg5+ followed by Bxf6 wins. B.2) 29... g6 30.Ncd5 Nxd5 31.Nxd5 Bxd5 32.exd5 and White is a pawn ahead with a much better position. For example, 32... b5 33.axb5 axb5 34.Rxf7 Rxf7 35.Rxf7 Qxf7 36.Qxc8 wins a second pawn. This is all I can do today. |
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| Jun-21-15 | | Moszkowski012273: No lie I have to meet this <chrisowen> guy... Also--- 32...Nf6 is a prettier mate imho. |
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| Jun-21-15 | | RandomVisitor: After 10...b6:
click for larger viewRybka 4.1 x64:
<[+0.13] d=23 11.Bf3 Bb7 12.Qd2> Re8 13.g4 Nc6 14.g5 Nd7 15.Rad1 Nxd4 16.Qxd4 Rac8 17.Rf2 Qd8 18.Bg4 Nc5 19.h4 Bc6 |
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| Jun-21-15 | | CHESSTTCAMPS: Try playing the puzzle position against Crafty, using the following URL: http://www.chessvideos.tv/endgame-t... Needless to say, if you came up with a flawed solution, Crafty will enlighten you! |
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| Jun-21-15 | | CHESSTTCAMPS: One general lesson from the last couple of puzzles this week - keeping the tension in a position may be a good approach in many cases, but there are also many situations where a key simplification (e.g. 27.Bxe5!) gets the result. |
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| Jun-21-15 | | Sniffles: Not seeing a very difficult puzzle. The play is quite intuitive. On the left, Nero fiddled, on the right, Rome burned.
29... RE6 wasn't the brightest bulb in the light factory. |
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| Jun-21-15 | | RandomVisitor: After 9...Qc7:
click for larger viewRybka 4.1 x64:
<[+0.23] d=23 10.Bf3> Nc6 11.Nxc6 bxc6 12.Na4 c5 13.c4 Bb7 14.Qc2 Rad8 15.Rad1 Nd7 16.b3 h6 17.Kh1 Rfe8 18.Qd2 |
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| Jun-22-15 | | Tiggler: <abuzic: 27.Nf6+ Kh8 28.Nxh7 Kxh7 29.Bxe5 Rxe5 30.Qh3+ <this is stronger the other options> Kg8 31.Rxf7> This was my solution also. It wins by force, even though it is second best to 27. Bxe5 etc. |
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