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Oct-15-13
 | | Phony Benoni: Nice deflection, the point being not so much the fork as driving the queen away from protecting g7 |
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| Oct-15-13 | | Bartimaeus: Despite material equality, White has built up a very strong attack on the Black king. The Queen is heavily loaded with defensive duties trying to protect both g7 and g6. The objective seems to be just pile on the load a bit more thereby causing the entire black defense to tip over. Be7 achieves this beautifully. A) 31. Be7 Qxe7 32. Qxg7+ Ke6/8 33. Qxe7#
B) 31. Be7 Kxe7 32. Rxg7+ Kd6 (Ke8/f8 leads to mate soon) 33. Rxg6 winning the Queen and the game comfortably. |
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| Oct-15-13 | | paramount: Very nice puzzle maybe for tomorrow. |
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| Oct-15-13 | | weary willy: Good puzzle. I spent an embarrassing amount of time trying to make Bxg6 and Rxg7 work - but, I agree with paramount that it feels Wednesday-ish ... although perhaps not for replay tomorrow. PS England 3-1 Poland |
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Oct-15-13
 | | agb2002: White has the bishop pair for a bishop and a knight. The black royal family protects the bishop. This suggests 31.Be7, trying to divert the king or the queen: A) 31... Kxe7 32.Rxg7+
A.1) 32... Kd(e)6 33.Rxg6 + - [Q+B+P vs R+N].
A.2) 32... Ke8 33.Qh8+ Qf8 34.Bxg6#.
A.3) 32... Kf8 33.Qh8#.
A.4) 32... Qf7 33.Qg5+ Ke8 34.Rxf7 Kxf7 35.Qxd8 + - [Q+B vs N]. A.5) 32... Qxg7 33.Qxg7+ and Black will lose more material. B) 31... Qxe7 32.Qxg7+ Ke6(8) 33.Qxe7#.
C) 31... Kg8 32.Bxf6 Bxh6 33.Bxg6 (with the triple threat 34.Rh8#, 34.Bxd8 and 34.Rxh6) 33... Bg7 34.Rxg7+ Kf8 (34... Kh8 35.Rh7+ Kg8 36.Rh8#) 35.Rh7 and mate in three. D) 31... Ke8 32.Rxg7 wins.
E) 31... Rh8 32.Bxf6 Rxh7 33.Qxh7 Kxf6 34.Qxg6+, etc. |
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| Oct-15-13 | | diagonalley: well yes... 31. B-K7... but i confess it took me a full 10-12 minutes to come up with that... not quite "easy" methinks |
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| Oct-15-13 | | Patriot: 31.Be7
31...Qxe7 32.Rxg7+ 
31...Kxe7 32.Rxg7+ Ke6/Kd6 33.Rxg6
31...Kxe7 32.Rxg7+ Kf8/Ke8 33.Qh8#
31...Ne3 (threatening mate on the spot!) 32.Qxg7+ Qxg7 33.Rxg7+ Kxg7 34.Bxd8 (I think 32.Qxg7+ is necessary in this line to make sure the next move is at least a check) 31...Rd1+ 32.Kxd1 Ne3+ 33.Ke2 Nf5 34.Bxf5 Qxf5 35.Rxg7+ Ke6 36.Qxg6+ Qxg6 37.Rxg6+ Kxe7 38.Rxc6 31.Be7 is a quiet move, making it a little more difficult for a Tuesday. I pretty much had to eliminate other possibilities first. |
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| Oct-15-13 | | Patriot: Ok, so 31...Ne3 32.Bxd8 wins although my line simplifies and wins. And my third line after 32...Ke8, 33.Qh8 is not mate as <agb2002> points out. |
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| Oct-15-13 | | TheaN: Tuesday 15 October 2013
<31.?>
This Tuesday puzzle is a typical example of a pressure increasing position, where it's white's job to find the final chain in a combo of pressures that overload the black defense. The key is the weakness and immediate danger of mate on g7. White's actual offense on g7 is too weak, even with potential pins. The only way white can continue is by pressuring the square in question, or the current defense. Offense is impossible, reducing defense can only be done in two ways. 31.Bxg6+ Qxg6  keeps the queen too close and doesn't work, but the other way around works. <31.Be7> and black's structure falls apart. Not so much that white gains Bg7, that would be a trade of bishops. The point is that the whole structure collapses, winning either king or queen. Neither capture works to avoid this, but there are no alternatives to save the king otherwise. After 31....Qxe7 32.Rxg7+ decides immediately as it skewers king and queen, but similarly: <31....Kxe7 32.Rxg7+ Kd6 (Kd8 33.Qh8+ Qe8 34.Bxc6 Rd7 35.Bxd7+ ) 33.Rxg6 > wins queen for rook as well. |
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| Oct-15-13 | | TheaN: Of course my alternative line is mistyped and should 32....Ke8 with 33.Qh8+ Qf8, but even then 34.Bxc6+ would still be inferior to 34.Bxg6#. Missed this nuance, but the point being that black is completely lost after 32....Ke8 anyway. Initially I missed the mate threat or the immediate Rd1+. The position doesn't really call for fireworks from black, and 32.Bxd8 is a slap to the face for black: the exact same threats still cripple black. |
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| Oct-15-13 | | morfishine: <agb2002> Nice post! This one of those odd situations where, at least for me, the solution was seen more clearly when viewed from the opposite side ***** |
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| Oct-15-13 | | Kikoman: <Puzzle of the Day> I spent almost 5 minutes to solve this puzzle. I tried Bxg6+ and Rxg7+ but it failed. So I tried 31. Be7! which is the best answer. |
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| Oct-15-13 | | Morttuus: Hmm...30...a6 seems a bit pointless. Didn't black have something better than this? What if black played 30...Rh8? |
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Oct-15-13
 | | whiteshark: <31.Be7>, and that's it. Oh, I see, black tried a last swindle... |
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| Oct-15-13 | | LoveThatJoker: <31. Be7!> 1-0
A) 31...Kxe7 32. Rxg7+ Ke6 (32...Ke8 33. Qh8+ Qf8 34. Bxg6#) 33. Rxg6 B) 31...Qxe7 32. Rxg7+
C) 31...Qe6 32. Qxg7+ Ke8 33. Qf8+ Kd7 34. Qxd8#
LTJ |
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| Oct-15-13 | | LoveThatJoker: <Patriot> Excellent job finding the game move 31...Ne3! <Patriot & agb2002> As you can both see, I didn't include 31...Ke8 in my solution post. So I am passing no judgement whatsoever. For the sake of just noting it (I found this moving the pieces around on the board post-mortem, <morf>'s term), it should be stated that after 31. Be7! Ke8 32. Bxf6 is a neat alternative! 
click for larger viewLTJ |
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| Oct-15-13 | | zb2cr: 31. Be7. Whether Black captures with King or Queen, the critical protection of g7 is reduced. For the follow-up, see nice commentary by <Bartimaeus>, <agb2002>, <Patriot>, <TheaN>, and <LoveThatJoker>. |
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| Oct-15-13 | | LoveThatJoker: <zb2cr> Thank you for the kind inclusion!! LTJ |
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| Oct-15-13 | | morfishine: <Patriot> Nice job! No recourse for Black <LoveThatJoker> At least for me, I always use a PGN viewer in PM whether I solved the puzzle visually or failed. This is particularly useful in finding better defensive tries for the loser. Occasionally, I won't solve the puzzle even with a PGN viewer :( For example, the diabolical puzzle on Saturday: B Zueger vs C Landenbergue, 1991 :) ***** |
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| Oct-15-13 | | LoveThatJoker: <morf> Interestingly enough, I always go to your page to get the exact link to the PGN viewer on chesstempo. As you recall, I mentioned that to you - you were (and are) sage and far-sighted to post it on your profile. The next time such a puzzle comes up, I know you will solve it correctly, man! LTJ
PS. I meant to ask you about a History Channel documentary - have you seen all of it? "Vietnam in HD"
Damn, that looks good! Alas, I've only gotten to record the very first episode - it seems that they are not showing it on a weekly basis, but only as a one-off. I hope that changes. Oh well, perhaps I can YouTube it. |
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| Oct-15-13 | | Marmot PFL: This is not as simple as calculating obvious moves to check if they work, which often takes under a minute. I didn't get it at all until asking what the role of the Bc5 could be, then spotted 31 Be7, all of which took a few minutes. |
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| Oct-15-13 | | LIFE Master AJ: I spent at least a minute ... maybe more, just staring at the screen. Then I saw 31.Be7! (fork) which seems to work in all lines ... I am sure someone else mapped out the variations. (Someone else always does.) |
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| Oct-15-13 | | Castleinthesky: Another pretty diversion puzzle. I've been working through problems on the chess program CT Art 3.0. It is really old, but has helped me spot these alot more easily. |
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| Oct-15-13 | | Nick46: After tinkering with, and then dismissing, in turn, Qsac, Rooksac & Bishsac, I stumbled on, not to say tripped over, 31: Be7. |
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Oct-15-13
 | | kevin86: I missed Be7!! What a remarkable fork! |
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