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| May-16-08 | | dzechiel: Well, I got half of it. I wish I had looked longer at the game after 43 Qh2. |
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| May-16-08 | | orven: It seems like two moves are forcing, Rxh3 and Qe1. 41...Rxh3 leads to 42.Kxh3 but then there is no clear advantage. 41...Qe1+
42.Kf4 (if 42.Kg4 then Rg1 and the queen is pinned)
42...Qh4+
if
(43.Ke3 then 43...Qe7+,44.Kf4 K to f2 or d2 leads to Qe1#,44...Qf6+, (if 45.Ke3 Qe5+, then 46 Kd2 or e2 Qe1#)45.Kg4 Qf5+ 46.Kg3 Qe5+ 47.Kg4 (else mate in 1)Bf5+ (if 48.Kh4 Qf6+ 49.Kh5 Rxh3+ and white loses the queen to avoid mate)48. Kg5 Bxh3+ and the queen is lost, 48. Kh5 Bxh3+ 49.Qg5 Bf5 and the queen is still toastotherwise,
if 43.Ke5 Qg5+ and the white king is easy to harass to death, but I'll let someone else figure that out. whew, I hope I didn't miss anything |
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| May-16-08 | | lost in space: LHM, just saw that my first move 41... Qe3 is crap as Black can simply play 42. Qxh1 and Black is lost. Thought first about 41.. Qe1 and was not able to see a good continuation for Black after 42. Qh2. Then I found the "better" 41...Qe3. |
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| May-16-08 | | orven: Continuing where I left off:
41...Qe1+, 42.Kf4 Qh4+ 43.Ke5 Qf6+ (sorry, not Qg5+ or QxQ)44.Kd5 Qf5+
if: (45.Kc4 Qc5+ 46.Kb3 Bf7+ 47.Ka4 Qa5#)
if: (45.Kd6 Qc5+ 46.Kd7 (if 46.Ke6 Bf5#), Bf5+ 47.Kd8 or Ke8, Qc8+ 48.Ke7 Qf8#)
if: (45.Kc6 Qc5+ 46.Kb7 (else Kd7 leads to mate), then I am stuck, any help would be greatly appreciated! |
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| May-16-08 | | patzer2: <orven> I prefer the slightly stronger game continuation 42...Rg1! However, 42...Qh4+ 43. Ke5 leads to mate after 1.  (-#6): 43...Re1+ 44.Kd5 Qe7 45.Kc4 Qc5+ 46.Kb3 Bf7+ 47.Rd5 Bxd5+ 48.Ka4 Qa5# or
2. (-#8): 43...Qf6+ 44.Kd5 Qf5+ 45.Kc6 Qc8+ 46.Kb5 Be8+ 47.Rd7 Bxd7+ 48.Kb4 a5+ 49.Kb3 Be6+ 50.Ka4 Qc4# |
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| May-16-08 | | stacase: Yes, 41 Qe1+
Sooner or later that Rook & Queen were going to pick something off. I wasn't smart enough to plan on the unprotected Bishop. |
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| May-16-08 | | vangogh228: Move 45 for White is an incredible situation...
The King can legally move to any one of the three unoccupied black squares around him. However, if he does move to any of those three squares, it's Checkmate next move!!! All I can say is WOW. When I first looked at this, I wondered why he interposed the Rook, obviously at best losing the exchange. I wonder if I would have been too hasty OTB and actually lost the game at that point. |
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| May-16-08 | | hedgeh0g: 41...Qe1+ was obvious enough as White had only one reply and it was then simply a matter of checking with a well-coordinated Queen and Rook to win material. I got it all up to Qh4+ and then decided I was probably on the right track. |
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| May-16-08 | | zooter: On move 38, black repeats the same position twice (possibly under time pressure) before coming up with 40...Qg1+ setting up what would be a devastating blow... |
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| May-16-08 | | zooter: Crafty pretty much supports my analysis that there are some pretty interesting ways for white to get mated or lose material if King moves on after 45...Qc5+ instead of interposing the rook a) Off course not 46.Ke2 Qc2+ winning the queen
b) 46.Kd3 Rd1+ 47.Ke2 Qc2+ again losing badly
c) 46.Kd2 Bxe4 47.fxe4 (If White fails to capture the bishop, then he is quickly mated in all lines) 47...Qg5+ and now c1. White must avoid staying on the second rank by either 48.Kc2/e2 as 48...Rg2 wins the queen c2. 48.Kd3 Rg3+ 49.Kc4/d4 is met by 49...Qc5# while moving the king to the 2nd row leads to c1 c3. 48.Kc3 Rg3+ and white has to give up the queen or else he gets mated quickly in all variations by the queen on either Nothing you don't already know, but was wondering about the variations at this point in the game... |
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| May-16-08 | | dakgootje: Oh of course.. Got Qe1 and Kf4 but tried to make the immediate Qh4 work (well, had calced it didn't work actually :P) but couldn't find anything better and gave up on it... |
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| May-16-08 | | johnlspouge: Friday (Difficult): Black to play and win.
Material: Even, with Bs of opposite color, suggesting that a win must be in the midgame, not the endgame. In midgame positions with Bs of opposite color, the advantage of having the initiative is enhanced, because the defending side is weak on the squares controlled by the opposing B. White has 2 weaknesses: (1) Kg3 in the open and (2) 3 P islands. The White Qg2 protects Bb2, which protects Rd4, a tenuous but adequate arrangement for the present. The Black Qg1 pins Qg2 to Kg3 and attacks Rd4. The Qg1 and Rh1 form a battery on the 1-st rank and are mutually supporting, so almost any move of Qg1 is a threat to pin Qg2 to Kg3 with Rg1. The Black Bg6 has some defensive value, but is not particularly active yet. Candidates (41…): Rxh6+, Qe1+
41…Qe1+ (threatening 42…Rg1)
42.Kf4 Rg1 (threatening 43…Rxg2)
The White Qg2 has only 2 flight squares, d2 and h2.
(1) 43.Rd8+ [else, mate instead of 45.Kd4 in the following sequence] 43…Kh7 44.Qd2 Qg3+ 44.Ke3 Re1+ 45.Kd4
45…Qe5+ 46.Kc4 Qc5+ 47.Kb3 Bf7+ 48.Ka4 [else, lose Q+R for B] Qc6+ 49.Kb4 Qc4# (2) 43.Qh2 Qh4+
In the case of the flight Qh2, the interpolation 43.Rd8+, 43…Qh4+ forks Rd8, so the interpolation is not playable. The White Kf4 has 2 flight squares. (2.1) 44.Ke5 Qe7+ 45.Kd5 [Kf4 Qc7+ skewers Qh2]
45…Rg5+ 46.Kc4 [Kc6 Be8+ 47.Rd7 Qxd7#] Qc5+ 47.Kb3 Bf7+ loses as in line (1) (2.2) 44.Ke3 Qe7+ (threatening 45...Qe1# and 45…Qc7+ skewering the Qh2) 45.Re4 Qc5+
White cannot move Ke3 as follows: (2.2.1) 46.Kf4 Qg5#; and (2.2.2) 46.Ke2 Qc2+ or (2.2.3) 46.Kd3 Rd1+ 47…Qc2+ skewering the Qh2. (2.2.4) 6.Bd4 Qc1+, and the Black position collapses. (2.2.5) 46.Rd4 46…Re1+ and White skewers Qh2 with either Qc7+ or Qc2+ (2.2.6) 46.Kd2 Bxe4
and White has won the exchange, because Qc5 protects Rg1, and the many checks available make the fork 47.Bd4 against Qc5 and Rg1 toothless. I missed that 48.Kg3 protects Qh2, requiring the resulting fork after 48...Qxh2, but I think I would have noticed the fork over the board ;>) |
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| May-16-08 | | Waxmat: Looking for forcing moves, any Q move on the back rank obviously threatens 42 ... Rg8 pinning and winning, but 41. ... Qe1+ is especially forcing
42. Kf4 (not 42. Qf2 Rg1+  )
42. ... Rg2
43. Qh2 (forced) Qh4+
44. Ke3 (Ke5 doesn't need analysis to know it's not good for white) 44. ... Qe7 no more running away:
a) 45. Kd2 Qe1 #
b) 45. Kf2 Qe1 #
c) 45. Kf4 Qf6 45. Qe5
so d) 45. Re4 is forced and bad at least because of
45. ... Re1+ followed by Bxe4 but possibly there is still other fruit in 45. ... Qc5+ but I'm at my limit of what I can see now, and if I was playing over the board and found this forcing line where all roads lead to such a big edge after 4 moves, I would look no further and play Qe1. "time to check" as they say, but in this case I'm pretty sure I got it and it's a friday too! :) my saturday morning chess buddies better watch out tomorrow! |
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| May-16-08 | | EdwardT: what about Rh3+? |
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| May-16-08 | | YouRang: I think I found a solution, although by the end of it, my head was swimming way ahead of my board visualization ability. So, I couldn't be sure I'd solved it. I had 41...Qe1+ 42.Kf4 <forced; 42.Kg4 Rg1 ; or 42.Qf2 Rxh3+! 43.Kg2 Rh2+ > 42...Qh4 43.Ke3 <if 43.Qg4, it seems to make white even more vulnerable to skewers, e.g. 43...Qf6 44.Ke3 Re1+ 45.Kf2 Qe7 (threat:..Qe3 & Rg1+) 46.Bxe4 winning xchg> 43...Qe7+ 44.Kf4 <either 44.Kd2 or 44.Kf2 is met by 44...Qe1#> 44...Qf6+ 45.Kg3 <not 45.Ke3 Qe5+ ; or 45.Kg4 Bf5+ 46.Kg3 Qe5+ 47.Kh4 Qe1+ 48.Kh5 Rxh3+ > 45...Qe5+ 46.Kh4 <not 46.Kf2 Qe1#> 46...Qe1+ and here's where my board vision collapsed under the strain causing a brain crash, and I had to re-boot my head. Afterwards, I put my boot back on my foot and decided that I would simply be satisfied that white was in big trouble, and call it a day. |
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| May-16-08 | | YouRang: <EdwardT: what about Rh3+?> As in 41...Rxh3??
Then 42.Kxh3 and you're down a rook and losing. :-( |
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| May-16-08 | | newzild: 41... Qe1+
42. Kf4
(Not 42. Qf2 or 42. Kg4 because of Rg1, and goodbye Queen) 42... Rg1
43. Qh2 (forced. 43. Rd8+ Kh7 only delays the finale) Qh4+
44. Ke3 (44. Ke5 allows an obviously winning King-hunt) Now there are quite a few candidates: 44... Qe7+, 44... Re1+, and 44... Qg5+ among them. Aha! 44...Qe7+ wins, because 45.Kd2 or 45.Kf2 both fail to 45...Qe1++, and 45.Kf4 loses to 45...Qc7+, winning the queen on h2. The only alternative for white after 44...Qe7+ is to stick the rook in the way with 45.Re4. But then 45...Bxe4 looks winning, setting up a discovered check. Or does it? This seems to be getting too deep... In any case, I'm sure about the moves up to 45, because it's clearly a king-hunt. Time to take a look...
The only alternative is 45 |
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| May-16-08 | | newzild: Yeah, right enough I reckon. It's simply too far ahead after move 45. I'm sure black didn't analyse that far anyway - he was probably just happy with a king hunt. |
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| May-16-08 | | newzild: Ooops! I made one big error. Can you see it?
Yes, I said "he" instead of "she"...
I hope Judit Polgar isn't reading this. |
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| May-16-08 | | vangogh228: <waxmat said:
44. ... Qe7 no more running away:
a) 45. Kd2 Qe1 #
b) 45. Kf2 Qe1 #
c) 45. Kf4 Qf6 45. Qe5
so d) 45. Re4 is forced and bad at least because of...>BUT...
If c. 45 Kf4 then Qg5 MATE. |
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| May-16-08 | | TheaN: 4/5
Pfff.... haven't really got much more to say: looked so long at the Qh4+ continuation but I missed Qe7+ on Ke3, and I didn't calculate Ke5, thinking it would win. Btw, I think that 41....Qe1+ 42.Kf4 Rg1 43.Qd2? Qg3+! 44.Ke3 Re1+ is more effective than 43....Qh4+ which I've seen more. |
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| May-16-08 | | 234: Thursday puzzle <26. ...?> May-15-08 I A Horowitz vs Fine, 1934 |
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| May-16-08 | | DarthStapler: I got the first move, and some of the variations |
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| May-16-08 | | PinnedPiece: Followed all the forcing moves to 43 Qh4 but then couldn't see past ..Ke3 44 Qg5. Qe7 didn't occur to me!
A lot of planning went in to the capture of a bishop here, if that is what I am meant to believe. Is it possible to stumble into a winning capture? |
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| May-17-08 | | znprdx: The beautiful geometry of the sequence of checks is almost magical.( It reminds me of a classic B vs B 'ring around the rosy' problem) There need be no presumption regarding calculation: this is perfect synergy...all that counts is having the move and the possibilities become exponential. |
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