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Oct-18-12
 | | Abdel Irada: <Robespierre>: In _Paradise Lost_, Milton describes the "virgin" birth of the monster Death from its mother, Sin. This refers back to the biblical epigram in the title of my post. |
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Oct-18-12
 | | al wazir: OK, I'll bite. 12...Nf6 13. Ng4 (Honza's suggestion) gxh5 14. Nxf6+ Kg7 15. Rxh5 Rh8. Now what? If 16. Ne8+ Kg8 17. Nxc7 Bxc7 18. Bxh8 Kxh8, white is up an exchange and a  . That should be a win, but it's not enough to bring a shower of gold coins down on the board. |
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Oct-18-12
 | | scormus: 12 Qh5! Cool. 12 .... Nf6 I guess, and now .....
Drat, all that time I took before I saw the Ng4 follow up and it was 1-0 immediately |
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Oct-18-12
| | Abdel Irada: <al wazir>: After 12. ...Nf6; 13. Ng4 (not only Honza's suggestion; you'll see it in my post and others), gxh5; 14. Nxf6†, Kg7?, White does not play 15. Rxh5? The correct continuation is 15. Ne8††, forcing the Black king to g8 (where 16. Rg1 mates immediately), g6 or h6 (where it is mated quickly, as detailed in my post and several others). The continuation 15. Rxh5 occurs only in reply to the more accurate defense 14. ...Kh8, when there is no double check, and discovered checks for White fail to win. And there, as the final variation in my analysis shows, Black can bail out, at the cost of entering the endgame three pawns to the bad. |
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| Oct-18-12 | | stacase: Examine the Queen sacrifice first, and you will save a lot of time figuring out most of these puzzles. |
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Oct-18-12
 | | aidfarh: After 12...Nf6, I do see that 13. Ng4 is best. However, why is 13. Qh6 bad? If 13...d4 14 Ng4 wins, or is there something I'm missing? |
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| Oct-18-12 | | goodevans: <11.Rf3> is just naked aggression and black needs to play accurately to counter the obvious threat. He doesn't and he pays the price! |
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| Oct-18-12 | | Dr. J: Sorry, gang, but all the lovely analysis so far is wrong! Ater 12...Nf6
click for larger view13 Ng4? is a mistake. There is a quick mate after 13 Nd7!, the point being 13...gxh4 14 Rg3+ Kh8 15 Bxf6#, or 13...Qxd7 14 Bxf6 gxh5 15 Rg3#. Also, I think 13 Qh6, threatening 14 Ng4 is another quick simple mate. If I haven't made a mistake (well, two, actually) then this explains why Black resigned right away. |
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Oct-18-12
| | aidfarh: <Dr. J> After 12...Nf6 13 Nd7 gxh4 14 Rg3+, 14...Ng4 complicates things. |
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Oct-18-12
| | Abdel Irada: <Dr. J>: Your 13. Nd7 is an interesting and picturesque idea, but how did you plan to proceed after 13. ...Nxh5? |
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| Oct-18-12 | | captainandrewwiggins: white's knight on e5 is a colossal pain, how black can suffer this cancer in his centre is beyond me and i think goes principally towards his undoing that and white's fianchettoed bishop on that uncontested diagonal; from 9...0-0 where he castles, black just tolerates the knight, he's squandered three moves where he could have removed it and to stymie white's bishop, and moreover, he's blithely let that white rook on the open file to annihilate the king; black's got great potential to hold the centre, to wrangle some material and press for the win given superior manouverablity or he could go straight for the jugular and force a mate; he does neither. lesson to be learnt: do not tolerate a knight in your centre where he can run amuck; contenst it or ignore it to your demise. |
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| Oct-18-12 | | kasputine: The critical line is the following:
12 ... Nf6
13 Ng4 gxh5
14 Nxf6 Kh8 (Kg7 leads to mate)
15 Rxh5 h6
16 Nxd5 Kh7
17 Nxc7 Bxc7
18 Rxc5 and white remains with 3 pawns ahead. |
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| Oct-18-12 | | kasputine: This position can arise quite often with reversed colors in Nimzo-Indian openings with Bb4, b6, Bb7 Bxc3 etc. when white plays e3 instead of Bg5. In fact there is a game with exactly the same moves but with reversed colors. |
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Oct-18-12
| | aidfarh: I'm still waiting for a refutation for 12 ... Nf6 13. Qh6. One possible defense is 13... Nh5, in which case the game goes: 12... Nf6
13. Qh6 Nh5
14. Qxh5 f6
15. Nxg6 hxg6
16. Qh8+ Kf7
17. Qxf6 Ke8
18. Qxg6+ Kd7
19. Rh7+ Be7
20. Be5
click for larger view
where White is up 3 pawns with a strong attack. |
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Oct-18-12
| | aidfarh: Or rather, in my line above,
20. Bf6 Re8
21. Bxe7 Rxe7
22. Rxe7+ Kxe7
23. Qg7+ Kd6
24. Qxc7+ Kxc7
for a simply winning endgame.
click for larger view |
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| Oct-18-12 | | gofer: If Ne5 wasn't there then White would be able to play Qh5! and the only
way to stop mate gxh5 allow Rg3#! So we just need to move Ne5, sometimes
in these positions the right option is difficult to judge, but here its simple! <12 Nxd7 ...>
12 ... Bxd7 13 Qh5 mating
12 ... Rd8 13 Qh5 mating
<12 ... Qxd7>
<13 Bf6!! ...>
Suddenly Pf7 has become a huge problem for black.
13 ... Be7/Qe7 14 Qh5 mating
<13 ... Rd8>
<14 Rxh7! Kxh7>
<15 Qg4>
Game over...
~~~
Doh! Two days in a row where my choice has been the opposite of
everyone else. Yesterday I was completely wrong, but what about
today? Anyone tell me if <13 Bf6> works? |
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| Oct-18-12 | | Dr. J: <aidfarh: <Dr. J> After 12...Nf6 13 Nd7 gxh4 14 Rg3+, 14...Ng4 complicates things.>
THUNK! (Actually, White might still come out ahead after 14 Bxf6 Bxf4 15 exf4 Qxf4 16 Be5, but that's not the quick mate I advertised.) <Abdel Irada: <Dr. J>: ... how did you plan to proceed after 13. ...Nxh5?> THUD!! There's no saving this one.
Still, I think <aidfarh>'s 13 Qh6 may be best, but it, too, is not the fast mate that I thought. |
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Oct-18-12
| | aidfarh: <gofer> If 12. Nxd7, then 12... Bxd7
13. Qh5 f6! and there's no mate. |
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| Oct-18-12 | | jonyfin: 12...Nf6 13.Ng4 gxh5 14.Nxf6+ Kg7 15.Ne8+ Kg6 16.Rg3+ Kf5 17.Rg5+ Ke4 18.Nc3# |
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| Oct-18-12 | | Dr. J: <gofer> Your idea 12 Nxd7 Bxd7 13 Bf6 looks promising: 13...e5 14 Rh4 and Black holds on, but White has a considerable, probably winning positional edge. But the game continuation still looks better. |
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| Oct-18-12 | | captainandrewwiggins: kasputine: The critical line is the following:
12 ... Nf6
13 Ng4 gxh5
14 Nxf6 Kh8 (Kg7 leads to mate)
15 Rxh5 h6
no i think 15. Knxh5+ (discovered check) might be a better line requiring only rg3# |
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Oct-18-12
 | | morfishine: Black is set to liquidate favorably on <e5> <12.Qh5> White mates in two if Black captures the Queen:
12...gxh5 13.Rg3+ Kh8 14.Nxf7++ & mate; Meanwhile, White
threatens mate at <h7> Black is forced to play <12...Nf6> since its the only way to
protect <h7>
Here, I had to contemplate two candidates that look good for
White: 13.Qh6 & 13.Ng4
(1) <13.Qh6> Preparing to overwhelm the Black Knight.
White threatens 14.Ng4; 13...Bxe5 doesn't help now due to
14.Bxe5 Qe7 15.Bxf6 Qxf6 16.Qh7 mate; and 13...Nh5 is crushed by
14.Rxh5 gxh5 15.Qg5+ Kh8 16.Nxf7++ & mate;
If Black tries to give the King room with 13...Re8, then 14.Ng4
wins: If 14...Nxg4 15.Qg7 mate & if 14...Nh5 15.Rxh5
If Black tries to give the King room with 13...Rd8 14.Ng4 Ne8
15.Nf6+ Nxf6 16.Bxf6 Bf8 17.Qxh7 mate
(2) <13.Ng4> double-attack on the protector of <h7>; Black can't
play 13...Nxh5 due to 14.Nh6 mate; and 13...gxh5 14.Nf6+ Kg7
15.Ne8++ Kg6 16.Rg3+ Kf5 (16...Kh6 17.Bg7 mate) 17.Rg5+ Ke4
18.Nc3 mate
From what I can tell, after <12.Qh5 Nf6> both 13.Qh6 & 13.Ng4 win
for White |
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| Oct-18-12 | | Dr. J: <aidfarh: 12...Nf6 13. Qh6 Nh5 14. Qxh5 f6 15. Nxg6 hxg6 16. Qh8+ Kf7 17. Qxf6 Ke8 18. Qxg6+ Kd7 19. Rh7+ Be7 20. Bf6 Re8 21. Bxe7 Rxe7 22. Rxe7+ Kxe7 23. Qg7+ Kd6 24. Qxc7+ Kxc7 for a simply winning endgame.> Black can avid the general exchanges, by 18...Kd8 19 Bf6+ Be7, but of course White's advantage is still immense. |
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Oct-18-12
 | | FSR: Easy if you've seen this sort of thing before. I have - Black does it in a line of the 4.e3 b6 Nimzo-Indian. 13.Qh5! Nf6 14.Ng4!! crushes. The only line of any difficulty is 14...gxh5 15.Nxf6+ Kg7 (15...Kh8 16.Rxh5 Kg7 17.Ne8+ Kg6 18.Rg5+ Kh6 19.Bg7#) 16.Ne8+ Kg6 (16...Kg8 17.Rg3#; 16...Kh6 17.Bg7+ Kg6 18.Rg3+ etc.) 17.Rg3+ Kf5 (17...Kh6 18.Bg7#) 18.Rg5+ Ke4 19.Nc3#. But wait, I'm confused by 15...Kh8! 16.Rxh5 h6! I'm probably overlooking something obvious, but I don't see how to win against that line. Alternatively, there's 15.Nh6+!? (instead of 15.Nxf6+) Kg7! 16.Rg3+ Kxh6 17.Bxf6 (threatening 18.Bg7#), but that line also isn't so clear to me. After 17...Bf8 18.Bg5+ Kg6 19.Bd8+ White regains the queen but there's no mate. I would definitely go in for 13.Qh5! Nf6 14.Ng4 and hope it got clearer to me with a few more moves on the board. |
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Oct-18-12
| | Abdel Irada: <gofer>, <Dr. J>: The line 12. Nxd7, Qxd7; 13. Bf6 looks promising, but only as a long-term positional approach. After 13. ...Re8; 14. Rxh7?, we find that Black can defend and may be able to reach the endgame with the exchange for a pawn: 14. ...Kxh7; 15. Qg4, Bf8!; 16. Qh4†, Bh6; 17. Bg5, Rh8; 18. Bxh6 (not 18. Qxh6†, Kg8, trapping the queen), Kg8, and White can't move the queen to f6 because the bishop hangs. Then after, say, 19. Qg5 (to break the pin and prepare 20. h4 and 21. h5), Ba6; 20. h4, Qd8! White must allow the exchange of queens and may actually be worse. This does not constitute a refutation of the essential idea: to exchange on d7 and tie down Black's kingside with Bf6. But it does call into question the apparently premature rook sac on h7. |
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