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Friday, February 10, 2012
Aeroflot special chess tactic
Black to move. How should black proceed?
Source: ChessToday.net
12
comments:
Yancey Ward
said...
It took me a bit to figure out why c3 was superior to Qd1. I wanted to play Qd1, but after Bc3, white will find a haven for the king at h4 for long enough to make his own mate threat at g7 effective if black persists:
1. .....Qd1?! 2. Bc3 Qd4!
Trying for mate isn't going to work: [2. ...Qe2? 3.Kg3 Qf3?? 4.Kh4+]. Continuing:
3. Bd4 Bc6 4. a5 and black is up two pawns, but the bishops of opposite color endgame is a likely draw, even with connected passers.
Black needs to make the threat to bring the queen to g2. To do this requires diverting white's queen from eyeballing e4 (and also, f2 at move 4 below). This will cost white several pawns though I can't find a mate here, if there is one:
1. .....c3! 2. Qc3
The only move for all intents and purposes. Continuing:
2. .....Qe4 3. Kg3
Nothing holds here. White's queen can't guard g2 from anywhere safe other than g3, and that allows Qh1#. Continuing:
3. .....Qg2 4. Kh4 Qf2 5. Kg5 h6! 6. Kf6
Or 6.Kh6 Qh4#. Continuing:
6. .....Qh4 7. g5 hg5 8. Be1
I can't find a better move here. White can't take at g5 due to 8. ...Kf8 with the threat of Qh8# on the next move. If white tries Ke7, black just pushes g4 with discovered check followed by gh3-h2-h1. Continuing:
8. .....Qf4 9. Ke7 Qa5 and black should win quite easily from here by forcing the queens off, if need be. With so many extra pawns, even the bishops of opposite color is easy to win.
Blogger, being run by Google, is generally fast. The load time is slowed by: - iframes and - flash (e.g., videos that fully initialize)
One way to deal with youtube videos is to include an image of the video, but not load the flash player until someone clicks on it. This is what they do on Facebook. You will need to code it using Youtube's API, don't think Youtube gives it as one of the options.
and now 10. ..., Qxa4 is probably best. Black will be able to get queens off and win, even though it is bishops of opposite colour. However, I think
10. ..., Qe5ch, 11. Qxe5, dxe5
getting queens off immediately without fuss also wins, but in practice it will have to be played with more attention than the other line because of the greater danger of falling into a draw.
Seems that black must find something spectacular here, otherwise his king position looks quite bad. The first thing I look at here is the pawn sack: 1. ... c3! 2. Qxc3 (enforced) Qe4! (threats Qg2#) 3. Kg3 (enforced) but here I begin too feel uncertain, is continued attack really something enforced? Anyhow, there is hardly time to improve this idea, so I have to try: 3. ... Qg2+ 4. Kh4 Qf2+ 5. Kg5 (Qg3 Qxd2) h6+ 6. Kf6 (Kxh6 Qh4#) Qh4+ 7. g5 hxg5! (threats g4#) 8. fxg5 (otherwise white is at least comfortably up with two pawns) Qe4! (threats Qe6#) 9. Qb3 (enforced) and here I thougt black looks pretty good after Bd5, but better is of course: 9. ... Kf8! (threats Qe7#) 10. Qxb7 Qe6# White could probably have prolonged this somewhere, but would be quite bad, I think....
12 comments:
It took me a bit to figure out why c3 was superior to Qd1. I wanted to play Qd1, but after Bc3, white will find a haven for the king at h4 for long enough to make his own mate threat at g7 effective if black persists:
1. .....Qd1?!
2. Bc3 Qd4!
Trying for mate isn't going to work: [2. ...Qe2? 3.Kg3 Qf3?? 4.Kh4+]. Continuing:
3. Bd4 Bc6
4. a5 and black is up two pawns, but the bishops of opposite color endgame is a likely draw, even with connected passers.
Black needs to make the threat to bring the queen to g2. To do this requires diverting white's queen from eyeballing e4 (and also, f2 at move 4 below). This will cost white several pawns though I can't find a mate here, if there is one:
1. .....c3!
2. Qc3
The only move for all intents and purposes. Continuing:
2. .....Qe4
3. Kg3
Nothing holds here. White's queen can't guard g2 from anywhere safe other than g3, and that allows Qh1#. Continuing:
3. .....Qg2
4. Kh4 Qf2
5. Kg5 h6!
6. Kf6
Or 6.Kh6 Qh4#. Continuing:
6. .....Qh4
7. g5 hg5
8. Be1
I can't find a better move here. White can't take at g5 due to 8. ...Kf8 with the threat of Qh8# on the next move. If white tries Ke7, black just pushes g4 with discovered check followed by gh3-h2-h1. Continuing:
8. .....Qf4
9. Ke7 Qa5 and black should win quite easily from here by forcing the queens off, if need be. With so many extra pawns, even the bishops of opposite color is easy to win.
1...c3!
2.Qxc3 Qe4
3.Qg3 Qh1#
1... c3
2. Qxc3 Qe4
0-1
if 3. Qg3, Qh1#
else 3. ... Qg2#
Also white has no checks with Q etc
2 extra pawn is good enough to win the game. Queen exchange can simplify it.
But when you are asking for tactics
c3, Qxc3 then Qe4 is an easy win.
Blogger, being run by Google, is generally fast. The load time is slowed by:
- iframes and
- flash (e.g., videos that fully initialize)
One way to deal with youtube videos is to include an image of the video, but not load the flash player until someone clicks on it. This is what they do on Facebook. You will need to code it using Youtube's API, don't think Youtube gives it as one of the options.
c3 wins the bishop. if
1. ... c3
2. Qxc3, then Qd5
3. Qg3 Qh1#
3. Qf3 Qxf3
3. Qc8+ Bxc8
3. else Qg2#
greets, jan
sorry, i meant Qe4, not Qd5. jan
No utterly forcing line, but, say:
1. ..., c3,
2. Qxc3, Qe4,
3. Kg3, Qg2ch,
4. Kh4, Qf2ch,
5. Kg5, h6ch,
6. Kf6, Qh4ch,
7. g5, hxg5,
8. Be1, Qxf4ch
9. Ke7
and now 10. ..., Qxa4 is probably best. Black will be able to get queens off and win, even though it is bishops of opposite colour. However, I think
10. ..., Qe5ch,
11. Qxe5, dxe5
getting queens off immediately without fuss also wins, but in practice it will have to be played with more attention than the other line because of the greater danger of falling into a draw.
c3!
1. c3 to threaten the bishop. 1...Qxc3 (what else?) 2. Qe4 to threaten mate. What can white do?
Because bishops are on opposite color squares, Black should place his pawns on the same color controlled by his bishop. 1...d5! is therefore in order.
Seems that black must find something spectacular here, otherwise his king position looks quite bad.
The first thing I look at here is the pawn sack:
1. ... c3!
2. Qxc3 (enforced) Qe4! (threats Qg2#)
3. Kg3 (enforced)
but here I begin too feel uncertain, is continued attack really something enforced? Anyhow, there is hardly time to improve this idea, so I have to try:
3. ... Qg2+
4. Kh4 Qf2+
5. Kg5 (Qg3 Qxd2) h6+
6. Kf6 (Kxh6 Qh4#) Qh4+
7. g5 hxg5! (threats g4#)
8. fxg5 (otherwise white is at least comfortably up with two pawns) Qe4! (threats Qe6#)
9. Qb3 (enforced)
and here I thougt black looks pretty good after Bd5, but better is of course:
9. ... Kf8! (threats Qe7#)
10. Qxb7 Qe6#
White could probably have prolonged this somewhere, but would be quite bad, I think....
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