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Later Kibitzing> |
| Mar-09-11 | | Patriot: I got lost in the details on this. My first game last night involved the f7 weakness--my weakness! Here's how it went (I was black):
1.d4 Nf6 2.Nf3 g6 3.Bf4 Bg7 4.e3 O-O 5.Bc4 d6 6.Nbd2 Nbd7 7.O-O Re8?? 
click for larger view8.Bxf7+! Kxf7?? 9.Ng5+ Kg8 10.Ne6 Resigns
Before playing 7...Re8, I calculated the classic sacrifice 8.Bxf7+ Kxf7 9.Ng5+ Kg8 and saw nothing beyond that. I can't explain it except that I'm human. Maybe I need to study lots of tactics dealing with the f7/f2 weakness and/or trapped pieces. My opponent was rated around 1540 and I won the next two games--both against players rated around 1730. I managed to gain a whole point in USCF. |
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| Mar-09-11 | | alachabre: <sevenseaman> Might I suggest that Nh6 was hard to find because the follow-up Bxh6# is not immediately obvious? I notice that I neglected to finish that line in my analysis, as if it was crystal clear to the casual observer, which it really is not from the original position. |
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| Mar-09-11 | | SufferingBruin: I should say for the two of you that might be curious that <I> missed it. I'd tell you why but then I'd be plagiarizing <sevenseaman> and compared to him, I write like a kindgergartner. I'm better off reading <Once> and smiling. Yeah, I'm in a fawning mood this morning. |
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Mar-09-11
 | | scormus: nice finish to a deceptively tricky position, veiled threats of dis+ always make me nervous. I found the moves but didnt see it was # after 11 Nh6 gxh6, though I also wasnt sure how best to go if B put the K somewhere else. Went with the more silod (oops, Freudian slip) 9 Nxe7+. Glad to see I'm in good company with <gofer> and <eblunt> and that <Once>'s analysis means we get the points decision. |
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| Mar-09-11 | | DarthStapler: I at least considered the first two moves |
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| Mar-09-11 | | kevin86: Another easy one...white threatens mate in two ways,if the knight captured,the bishop mates in crossfire fashion,aided by the queen. |
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| Mar-09-11 | | agb2002: From an Scotch Game, I think.
White is a pawn down.
Black threatens 9... Nxg5 and 9... Bxg5.
The black castle looks poorly protected, in particular f7. Therefore, 9.Bxf7+: A) 9... Kxf7 10.Qd5+ Kf8 (10... Kg6 11.Nh4+ Kh5 12.Bxe7+ and 13.Bxd8) 11.Nh6 gxh6 (11... Nf6 12.Qf7#) 12.Bxh6#. B) 9... Kf8 10.Nxe4 (10.Bxe8 Nxg5 is unclear)
B.1) 10... Kxf7 11.Qd5+ is similar to A.
B.2) 10... Bxg5 11.Bxe8 Qxe8 (11... Kxe8 12.Qh5+) 12.Qe2 + - [R+N vs 2B]. C) 9... Kh8 10.Nxe4 Rf8 11.Nxe7 Nxe7 (11... Rxf7 12.Ng6+) 12.Qh5 + - [N]. Another option is 9.Nxe7+ Nxe7 10.Nxe4 d5 11.Bxe7 Qxe7 12.Bxd5 c6 but Black looks better. |
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| Mar-09-11 | | Marmot PFL: David Bronstein (200 Open Games) gives a list of objectives for all open (1 e4 e5) positions. #1 on the list for white - the attack on f7.
#1 for black - the defence of f7. |
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| Mar-09-11 | | CHESSTTCAMPS: In view of the number of plausible candidates in today's POTD, I took a slight detour from my usual approach. Instead of trying to glom on to the best move quickly and then analyze it to "proof" of result, I spent some time considering the ordering of candidates. Of course, chess engines order candidates by examining forcing moves first (especially checks and captures), a pragmatic, effective approach that a number of kibitzers on this site advocate regularly. In this position, there are 5 white moves that involve piece captures and checks, including one move that does both. However, I noticed that 9.Qd5(?) threatened mate in two; therefore, I decided it could be upgraded to a designation of "forcing" and promoted to #1 in a human ordering of candidates. I had already looked at defenses 9... Rf8? and 9... Kh8? before I noticed that 9... Nxg5 is an instant refutation. So much for trying to play beat the computer - back to common sense and my formulaic write-up. In this opening position, white has gambited a pawn in order to obtain active minor pieces and a strong intiative. Black has a loose knight on e4, but white can't grab it right away in view of 9.Nxe4 Bxg5 and black's control of the open e-file turns the tables. Therefore, white must first play: 9.Nxe7+
As a capture and a check, this forcing move must get top billing. As side benefits, it preserves the bishop pair and puts extra wood on the e-file to shield the WK. Black can't avoid material loss: A) 9... Nxe7 10.Nxe4 d5 11.Be2 f6 12.Bxf6 gxf6 (dxe4 13.Qxd8) 13.Nxf6+ wins an exchange + pawn and exposes the BK. A.1) 11... dxe4 12.Qxd8 Rxd8 13.Bxe7 wins a piece.
B) 9... Rxe7 10.Bxe7 Qxe7 11.Nd5! Qc5 12.Qe2 Nd6 13.Bb3 with the exchange + intiative for a pawn. B.1) 10... Nxc3 11.Bxd8 Nxd1 12.Bxc7 Nxb2 13.Bc3 with an exchange advantage and a trapped Nb2. Time to see if there is something more decisive.... |
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| Mar-09-11 | | CHESSTTCAMPS: Yep, I missed it - I liked the looks of 9.Bxf7+ but was blind to 11.Nh6, focusing my attention on g7. |
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| Mar-09-11 | | Sharpen Your Tactics: I spent alot of time calculating moves starting with Qd5. totally missed it although I often play a Bf7 sac in the openings I play. |
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| Mar-09-11 | | PhilFeeley: I take one look at this position and I think, "There's gotta be a mate in here somewhere!" So, start with 1. Bxf7+ (the weakest square) and go from there. Unfortunately, instead of Qd5+, I thought Qh5+ would do it, but I suppose if I looked longer I would have found the rest. |
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Mar-09-11
 | | doubledrooks: I went with 9. Bxf7+ Kxf7 10. Qd5+ and now:
a. 10...Kg6 11. Nh4+ Kh5 12. g4+ Kxg4 13. Rg1+
a.1 13...Kh3 14. Qf5+ Kxh2 15. Nf3#
a.2 13...Kh5 14. Bf6+
a.2.a 14...Ne5 15. Qxe5+ Kh6 16. Bxg7#
a.2.b 14...g5 (I failed to notice this in my original analysis) 15. Qf7+ and mate next move b. 10...Kf8 11. Nh6 and mate next move. |
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| Mar-09-11 | | stst: Not much comment today, everything follows naturally, including 10. ..Kg6 to expose itself for further harassment. |
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| Mar-09-11 | | wals: Got that one.
The King is really stitched up.
End result,
Analysis by Rybka 4 x64: d 16 : 4 min :
1.  (#1): 11...Nxg5 12.Qg8#[]
2. (#1): 11...Bxg5 12.Qf7#[]
if 11...gxh6,
(+#1.) 12. Bxh6#.
Black's blunder:-
8...Nxe4, +1.62. Best,
1. = (-0.13): 8...Bb4 9.0-0 Bxc3[] 10.bxc3 Rxe4 11.Qd3 d5 12.Bxf6[] Qxf6 13.Bxd5[] Re8 14.Ne3 Ne5 15.Qd4 c6 16.Bb3 b6 17.f4 Ng4 18.Nxg4 Bxg4 19.Qxf6 gxf6 20.Rfe1 Kg7 21.Kf2 Kg6 22.Kg3 Bf5 23.Rad1 2. = (0.23): 8...d6 9.Nxe7+ Qxe7 10.0-0 Qe5 11.Qd2 h6 12.Bxf6 Qxf6 13.Nd5 Qd8 14.Rae1 Ne5 15.Be2 a5 16.f4 Nd7 17.Bf3 c6 18.Ne3 Nc5 |
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| Mar-09-11 | | Patriot: I calculated up to 11.Nh6 but thought 11...Nxg5 took care of it (protecting f7) and failed to notice 12.Qg8#. How many of you made this mistake? |
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Mar-09-11
 | | Penguincw: When I looked at the front page,the position sort of reminds me of a famous Ruy Lopez trap which goes: 1.e4 e5 2.♘f3 ♘c6 3.♗b5 a6 4.♗a4 ♘f6 5.0-0 ♗e7 6.♖e1 b5 7.♗b3 d6 8.c3 0-0 9.h3 ♘b8 10.d4 ♘bd7 11.♘bd2 ♖e8?? 12.♗xf7+.
click for larger view
It was only played once in the database,however the trap wasn't played:Judit Polgar vs Spassky, 1993. |
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| Mar-09-11 | | morfishine: <alachabre> I am impressed with your determination and thoroughness. Give it time: fruit will bloom (does fruit bloom?). I have been undergoing a rigorous analysis of endgame positions from the recent POGO game. What I've found is my calculating speed is increasing over time, and thats the name of the game: calculate quickly. Keep at it and stay focused :) Morf |
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| Mar-09-11 | | mworld: I took the Nxe7+ road thinking bxf7+ worked a bit better later on down the line - its obviously better first, I just missed that bxh6 was mate when looking at it. My line was 9.Nxe7+ Nxe7 10. Bxf7+ Kxf7 11. Qh5+ Kg8 12. Nxe4 |
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| Mar-09-11 | | BOSTER: <sevenseaman> <eluded Nh6. >
Looking at diagram on your comment I have to say that before playing Nh6 I saw the position like this.
click for larger view
with Boden's mate in the air. Sometimes it is very useful to see the pattern.
And.. when we try to find the solution to the <CG> puzzle, we spend "n" time to find the first move of combo, but then we forget that the position after this move (and reply), or second ... we have to try the same way as a new puzzle. |
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| Mar-09-11 | | CHESSTTCAMPS: <BOSTER:> Your diagram reminded me that we more often see Boden's mate on the queenside because of the long castle. Perhaps that contributed to my blindness in this case. |
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| Mar-09-11 | | alachabre: <morfishine> Thanks, morf. My youngest son (now 25) has finally gotten to the point where he beats me consistently, so I'm "hitting the books" again. As an aside, I was just looking at my analysis, and realized I left out a whole move in the 10. ... Kg6 line: 11. Nh4+ Kh5 and now 12. Bxe7+. |
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| Mar-09-11 | | TheoNov: After 9...Kh8, sure White is up the exchange, but it is not an easy win: 10. Nxe4 Bxg5 11. Bxe8 Qxe8 12. O-O Bd8 (what else? 12. .. d5 (or d6) 13. Nxg5 Bxf5 is no better, and 12. .. Qxe4?? 13. Re1 wins the queen.) 13. Qd5 Qg8 14. Ne3 d6 15. Qxg8+ Kxg8 16. Rad1 Rb8
17. Rfe1 b5 18. f4 h6 19. Rd2 Kf7 20. g3 a5 21. Nc3 Ne7 
click for larger viewStill a long tough battle ahead. Can anyone find an improvement for White? |
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| Mar-10-11 | | patzer2: Yesterday's Wednesday solution 9. Bxf7+! exploits the weakened castled position. However, IMO it's more difficult than our typical mid-week offering. After 9...Kh8!, Black is at a disadvantage, but can make a fight of it.
White can win but it's not a piece of cake. Also the mate after 10...Kg6 11. Nh4+! is not so obvious either. |
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| Mar-10-11 | | morfishine: <alachabre>...<As an aside, I was just looking at my analysis, and realized I left out a whole move in the 10. ... Kg6 line: 11. Nh4+ Kh5 and now 12. Bxe7+>...Yep, thats the one that crushes...You see, you went back, you found it and now you know it...thats the way. Morf |
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Kibitzing
sac: 9.Bxf7+