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May-17-15
 | | Sally Simpson: The type of position me and 'The Art of Attack' used to spend hours just messing about with wringing it dry of every tactic possible.
click for larger viewIt is so easy to cock this up and I think I have being lured in by cute a variation like a miner chasing Fool's Gold. 'Fools Gold' would be a good title for book showing loads of unsound combinations. (I see one lad has gone for the attractive 16 Bxf6 Bxf6 and Rd7 - The e5 Knight hangs. There is nothing there.) I went for 16.Nd7 not expecting 16...Qc6 but 16...Nxd7 when White has 17.Bxe7 and the Bxh7+ and Qd3+ and Rxd7 trick. This hides a lovely wee variation and convinced it's how it I went for that. It's only when you stick it in your PGN thing you go....OOPS!
click for larger viewSo 16.Nd7 Nxd7 17.Bx7 Re8. 18 Bxh7+ Kxh7 19.Qd3+ Kg8 20.Rxd7. 
click for larger viewAnd then you see Black has 20...Be4 (Buggar!).
I was off over the rainbow saccing a Rook with...
20...Qc6 21.Qg3 Qxd7 22.Bf6!
click for larger viewWhite mates.
So when you see that you just know you are on the right track. Pity about 20...Be4 White still has a pull but it's not the type of pull I ever felt confident converting. I'd hope (hope Chess is forte.) my opponent would deem his position so miserable after 20...Be4 and go active with 20...Qc6. BTW that often happen when going over a game I'd won with my opponent. He played a double-edged move giving me my type of game saying if he did not then I'd have a plus in the ending. I would reply "Would I?... I don't know about these things." . In the actual game.
Here:
click for larger viewI like 18.Be4
The Bishop stops on it's way to sacking itself to defend it's King then BANG! on h7. 
click for larger viewBut Black does have to take it. (always consider this) Kh8 and White still has some work to do. White must be winning (Bxf6) but unless it's mate then it can still be cocked up. This is how you cock it up as White.
click for larger view19.Bxh7+ Kh8 21.Bxf6 gxf6 21.Rh4 Qg5 22.Rg4 Qh5
click for larger viewAnd you win the undefended Queen with 23.Rg8+ Rxg8 24.Qxh5. 
click for larger viewAnd resign after 24...Rxg2+ and 25...Rg5+
click for larger viewNo. The discovered check does not save you. |
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| May-17-15 | | fokers13: i saw Nd7 but thought the idea was to mess up black's castle by way of taking twice on f6. The attack conducted on the h file as in the game was more refined and superior indeed. |
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May-17-15
 | | patzer2: <Correction> Make that Fritz 12 @ 22 depth is assessing a win for White (not Black) after 16...Nxd7 17. Bxe7  (+1.53 @ 22 depth).<lost in space: I would have played 16. Bxf6 Bxf6 17. Rd7 with advantage> That was my guess for this Sunday's puzzle solution. The only problem is it's not really an advantage for White. White gets no more than equality after 16. Bxf6 Bxf6 17. Rd7! Qxe5! = when Fritz indicates play might continue 18.Rxb7 Rfd8 19.Be4 g6 20.Re1 Rab8 21. g3 = (-0.14, Fritz 12 @ 22 depth). |
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| May-17-15 | | morfishine: <patzer2> But what about 16.Nd7 Nxd7 17.Bxe7 Rfc8 18.Bxh7+ Kxh7 and now instead of Fritz's 19.Qd3+ White plays <19.Rh4+> Black has no way to prevent 20.Qh5; this coordinates with the DSB covering <f8> 19...Kg6 20.Qh5#
19...Kg8 20.Qh5 and mate next move
***** |
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May-17-15
| | patzer2: <Sally Simpson> In reference to the stronger Black line 16...Nxd7 17. Bxe7 Rfc8 18.Bxh7+! Kxh7 19.Qd3+ Kg8 20.Rxd7 Be4! (diagram below):
click for larger viewYou astutely observe <Pity about 20...Be4 White still has a pull but it's not the type of pull I ever felt confident converting.> P.S.: My thoughts exactly. White is a pawn up in the position but after 21. Qd2!  or 21. Rxc7 it's not so easy to convert this to a win. So I guess what we have today is a Sunday solution with 16. Nxd7!! to win a pawn with a clear advantage. Not as exciting or fun as a mating combo or winning decisive material, but none-the-less an instructive and practical puzzle. |
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May-17-15
| | patzer2: <Morfishine> After 16.Nd7 Nxd7 17.Bxe7 Rfc8 18.Bxh7+ Kxh7 19. Rh4+ Kg8 20. Qh5 (diagram below)
click for larger viewFritz indicates Black has 20...f5!  to  (-1.67 @ 18 depth). |
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| May-17-15 | | morfishine: <patzer2> Yikes, overlooked that simple move |
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| May-17-15 | | MrSpock: After 16. Nd7 Rfd8! black has good chances to draw. E.g. 17. Nxf6 Bxf6 18. Bxf6 gxf6  |
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May-17-15
 | | agb2002: The material is identical.
There are a number of candidates: 16.Bxf6, 16.Bxh7+, 16.Nd7, 16.Ng4, 16.Rd7, 16.Rh4, etc. I don't know. I'd probably play 16.Nd7 to eliminate the best defender or get the bishop pair. |
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May-17-15
| | patzer2: <MrSpock: After 16. Nd7 Rfd8! black has good chances to draw. E.g. 17. Nxf6 Bxf6 18. Bxf6 gxf6> (diagram below)
click for larger viewHere White can win a pawn after 19. Qg4+! Kf8 [not 19... Kh8?? 20. Qh4! f5? (20...Kg7 21. Rg4+ ) 21. Rg4! ] 20. Bxh7 . However, it's not a clear win, and, as in the 16...Nxd7 line, Black has practical drawing chances. |
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| May-17-15 | | RandomVisitor: After 16.Nd7: a deeper run is needed
click for larger viewRybka 4.1 x64:
<[+0.67] d=23 16...Rfd8> 17.Nxf6+ Bxf6 18.Bxf6 gxf6 19.Rg4+ Kf8 20.Bxh7 Qe5 21.Qxe5 fxe5 22.h4 f5 23.Rg5 Kf7 24.Bg6+ Kf6 25.Bh5 Bd5 26.Rg6+ Ke7 27.Rg7+ Kd6 28.Rd1 Rh8 29.Rg5 Kc5 30.g3 Bxa2 31.Bf3 Ra7 |
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| May-17-15 | | swordfish: For my part, I "saw" Bxf6 followed by Bxh7, Qh5+ and Rh4 (echoing Penguin I think). I didn't see that that loses (hopefully would over the board). |
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| May-17-15 | | lost in space: <<patzer2:> <Correction> Make that Fritz 12 @ 22 depth is assessing a win for White (not Black) after 16...Nxd7 17. Bxe7 (+1.53 @ 22 depth).
<lost in space: I would have played 16. Bxf6 Bxf6 17. Rd7 with advantage> That was my guess for this Sunday's puzzle solution. The only problem is it's not really an advantage for White. White gets no more than equality after 16. Bxf6 Bxf6 17. Rd7! Qxe5! = when Fritz indicates play might continue 18.Rxb7 Rfd8 19.Be4 g6 20.Re1 Rab8 21. g3 = (-0.14, Fritz 12 @ 22 depth).> Thanks <patzer 2>, will also have a closer look. |
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| May-17-15 | | Moszkowski012273: "Spoke" to WGM Sukandar this morning and let her know this game had been chosen for a Sunday puzzle.... She was honored! |
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| May-17-15 | | morfishine: Perhaps <16.Bxh7+> works afer all: (1) 16...Nxh7 17.Rd7
(2) 16...Kxh7 17.Bxf6
The last option (3) 16...Kh8 is a bit trickier
***** |
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| May-17-15 | | Tiggler: No solution today, except probable draw after 16.Nd7 Rfd8 . I think <chrisowen> gave all the plausible variations. |
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| May-17-15 | | ndg2: Did not see 16 Nd7. According to SF, it is the best move, yes, but it isn't actually really advantageous (with correct response 16..Nxd7).
Only black's anwer turns it truely into a winning move. |
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May-17-15
 | | Longview: I have seen this sequence or some pattern very similar in other CG puzzles. It seems even if 16. Nd7 is followed by Nxd7 the same pattern of Bxh7+ will allow White to win. Did not play it out. |
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| May-17-15 | | RandomVisitor: After 16.Nd7, final update of this line
click for larger viewRybka 4.1 x64:
<[+0.61] d=26 16...Rfd8> 17.Nxf6+ Bxf6 18.Bxf6 gxf6 19.Qg4+ Kf8 20.Bxh7 Qe5 21.Bb1 Rxd4 22.Qxd4 Qxd4 23.cxd4 Rd8 24.Rd1 e5 25.f3 Rxd4 26.Rxd4 exd4 27.h4 Ke7 28.Kf2 |
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| May-17-15 | | morfishine: <RandomVisitor> Whats your take on <16.Bxh7+>? |
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| May-17-15 | | dgm1214: Wish I'd thought of that.. |
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| May-17-15 | | Tiggler: <RandomVisitor: After 16.Nd7, final update of this line Rybka 4.1 x64:
<[+0.61] d=26 16...Rfd8> 17.Nxf6+ Bxf6 18.Bxf6 gxf6 19.Qg4+ Kf8 20.Bxh7 Qe5 21.Bb1 Rxd4 22.Qxd4 Qxd4 23.cxd4 Rd8 24.Rd1 ....> After 24.Rd1 in that line, Houdini 1.5a prefers 24. ..f5 (+0.31 d=28). Before then, however, Houdini chose 19. Rg4+ , and the continuation is: 19. .. Kf8 20. Bxh7 Qe5 21. Qxe5 fxe5
22. h4 f5 23. Rg5 Rd7 24. Bg6 Rd2 25. Re1 e4 26. g4 e3 27. fxe3 Rg2+ 28.
Kf1 Rd8 29. gxf5 Rdd2 30. Rxg2 Bxg2+ 31. Kg1 Be4 32. Bh5 Rg2+ 33. Kf1 Rxb2
34. f6 Bd3+ 35. Kg1 Rd2 36. Rd1 Rxd1+ 37. Bxd1 Kf7 38. Kf2 Kxf6 39. Be2 Bf5 40. c4 bxc4 41. Bxc4 a5 42. Kf3 Bc2 43. Bb3 Bd3 44. h5 Bf5 45. a3 Kg5 46. e4 Bg4+ 47. Kg3 Bxh5 48. Bxe6 Bg6 49. Bd5 ½-½ 
click for larger viewEither way, it's a draw.
Black's losing move was 16. ..Qc6??
I think that's what <Sally Simpson>/<chrisowen> said, each in their own way. |
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May-17-15
| | patzer2: <morfishine> Fritz shows 16. Bxh7+ as equal after 16...Kxh7 17. Rh4+ Kg8 18. Qd3! Qxe5 19. Bxf6 Qf5! 20. Qxf5 =. |
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| May-17-15 | | RandomVisitor: <Morfishine>At low ply, R4 sees white returning the pawn he wins on h7, for an equal game: 16.Bxh7
click for larger viewRybka 4.1 x64:
[+0.11] d=21 16...Kxh7 17.Rh4+ Kg8 18.Qd3 Qxe5 19.Bxf6 Qf5 20.Qxf5 exf5 21.Bxe7 Rfe8 22.Re1 Bd5 23.Rd4 Be6 24.Bg5 Bxa2 25.Rxe8+ Rxe8 26.Be3 Bc4 27.h4 a5 28.Kh2 Kh7 29.Kg3 Kg6 30.Kf4 f6 31.g3 |
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| May-18-15 | | morfishine: <RandomVisitor> Thanks for taking the time! I thought White could continue 17.Bxf6 but 17...Bxf6 is sufficient The puzzle position is almost an optical illusion.
***** |
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Kibitzing
sac: 19.Bxh7+