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Jan-31-10
 | | Jimfromprovidence: I tried about 10 different defenses for white after 17...Rac8 and they all failed. As an example, I felt good about the text response 18 Qb3, below. (It gives the king an escape square at d1 and protects against queen checks at both f4 and d4). 
click for larger view After 18... Bg5+ I tried 19 Kd1 instead, but that loses to 19...Qd4+ 20 Nd3 Ba4 below. (20 Qd3 is no good because of 20...Qa4+ with mate to follow). 
click for larger view |
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Jan-31-10
 | | waustad: <jane>They get harder as the week goes on. |
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| Jan-31-10 | | cyclon: Truly beautiful puzzle in it's potential richness. From the "jungle" of variations I dragged following after blown it off from the "spider-nets". It may or may not coincide with the game-line. It also may not be correct -heaven and "chip-chap" knows. 17. -Rac8 18.Qb3 Bg5+ 19.Kd3 (Kd1 Qd4+ 20.B/N/Qd3 Ba4/+ decides, also Ke1 Rxc1+, stop.) -Rf4 (hardest move to find to me) 20.Nf3 (tough choices for White are; Bxf4 Qxf4 wins immediately-Nf1 Qe4X or Nc4 dxc4+/Be3 Rf3-stunning move/naturally Bf3+ Rd4X/also all the Queen moves seems to lose for White) -R8c4 (this move was also rather difficult to find, but because I don´t have a pc-program this line (this idea to play with the both Rooks) may be incorrect. Anyway, this is the way I see Blacks plan. From the starting point in the puzzle he was 2 pieces down and it´s evident that he´s not gonna win just like that) 21.Bd1 Rxc1 (threat is now 22. -Rxf3 mating) 22.Rxc1 Rd4+ and now either 23.Nxd4 Qd2X, or 23.Kc3 Qe3+ 24.Kc2 Qxc1X. Most certainly there are plenty of other variations with their sub-variations etc., but this is my suggestion today whether right or wrong. |
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| Jan-31-10 | | cyclon: Ok. Interesting(!). I did not even CONSIDER 20. -Be8 that really seems to be the most effective move. |
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Jan-31-10
 | | Once: <Jane Sanders> Welcome! No, the puzzles are not normally this hard. The puzzles start at very easy on Monday - usually a one or two move tactic. They than get a little harder each day until Sundays which are graded as "insane". This also gives us an extra topic for conversation, as in "I thought that one was much too easy for a Tuesday" or "that was tougher than the average friday". Hope you enjoy yourself on the site. |
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| Jan-31-10 | | wals: The unsafe move 16.Nxe5 (-4.98) led to white's downfall.
16.Rf1 (-0.44) would have kept white in the game. |
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| Jan-31-10 | | cyclon: <scormus: Its a bit hairy. 17. ... Rac8 is the natural move then White makes it easy in the game - I guess he missed Blacks neat bishop manoever. He could have tried 18. Nxd7. Then 18. ... Bg5+ 19. Kd3 Rc4 (better than 19. ... Rf4 20. Be3! and I can't see Black's win) 20. B moves Rd4+ 21. Kc3 and game over, as they say. Please let me know if I missed something> Yes you have (pardon me). If (after 17. -Rac8) 18.Nxd7?, Black plays -Rf4 (instead of -Bg5+?), when threat is immediate mate by -Rd4X. White is then out of reasonable moves; f.e. 19.Qb3 (Nf5 exf5 wins) -Rd4+ 20.Qd3 and only now -Bg5X. |
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| Jan-31-10 | | SufferingBruin: <Jane> Welcome! This is the best board on a great site (IMHO). And yeah, you've found out by now that the puzzles get harder as the week goes on. For some, the puzzles don't get tough until Thursday or even Friday. For me personally, once the clock hits Tuesday, 9pm PST, I'm over my head! :) Seriously, enjoy the site. There's much to like here. |
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Jan-31-10
 | | patzer2: I suppose my previous familiarity with this game helped me to quickly settle on 17...Rac8!! as today's Sunday puzle solution. However, I had difficulty remembering the clever 19...Rf4! followup with multiple threats (e.g. 20. Bxf4 Qxf4!  ). |
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| Jan-31-10 | | SamAtoms1980: "Easy Week" would come to a crashing halt with this position. I bit on 17 ... Bg5+ when the White king can run out to b2 or b1. The big fish would get away and I would go hungry. The key is seeing that White has no good way to meet the coming 18 ... Bg5+ after 17 ... Rac8 is played. |
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Jan-31-10
 | | johnlspouge: Sunday (Insane):
E Kengis vs R Djurhuus, 1991 (17...?) Black to play and win.
Material: Down 2P for 2N. The White Kd2 has 3 legal moves, but is caught in the center. Black has a battery Rf8 and Qf2, with Qf2 pinning Be2 to Kd2. Black can regain a piece immediately with 17…Qf4+ 18.Kc2 Qxe5 19.Kb1
The position is likely favors White. The obvious remedy is to activate another piece to steal the flight squares on the c-file. White threatens 18.Nxd7. The Black Kg8 is secured from check. Candidates (17...): Rac8, Bg5+
17…Rac8, with the threat
(A) 18...Bg5+ 19.Kd3 Bb5+ 20.Nc4 Bxc4+ 21.K any Bxe2+ 22.K any Bxd1 23.Rxd1
Black has Q+2P for 2N.
(1) 18.Nxd7 Bg5+ 19.Kd3 <Rc4> (threatening 20.Qd4#) <[19...Rc4 20.Qg1 wins for White, according to Toga, so 19...Rf4 is mandatory.]> (2) 18.Qb3
Candidates (18…): Qf4+, Bg5+
18…Bg5+ 19.Kd1
[19.Kd3 Rxc1 20.Raxc1 Qe3+ 21.Kc2 Rc1+ 22.Kb1 Qxb3]
19…Qd4+ (threatening 20…Ba4, pinning and winning Qd3) 20.Qd3 [Ke1 Rxc1+ 21.Rxc1 Qd2#]
20…Ba4+ 21.Ke1 [b3 Bxb3+ 22.Ke1] Qf2#
A thorough tactical analysis eases the candidate choice, which is extremely difficult if you rely on forcing moves. The key is to prevent the flight of the opposing K (usually more profitable than check without a distinct object). |
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Jan-31-10
 | | Richard Taylor: I've completely solved a few of the "insane" ones but it usually involves too much time so I just do the easy ones mostly. I found this one fairly quickly though (Rac8 then ideas of Bg5+ and or Rf4 to d4+ and mates with the K on a2 and so on) etc but calculating the variations was hard. And I missed Be8 although I was looking for way to use that B - which in the French is always a problematic piece. |
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Jan-31-10
| | Richard Taylor: I had a difficult game as White when someone sacrificed on e5 and that is common idea (to break down the white pawn centre). But I got a draw. Here it is possibly unsound but leads to interesting play. In a sense then, Kengis was conned! But the position is very complex - anyone could go wrong find a defence for the right way to attack. Black relied on intuition, judgment, and some calculation I would say...and quite a bit of luck and bluff! But it was great play in practice! |
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Jan-31-10
| | Richard Taylor: Kengis once had a draw with Kasparov. |
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Jan-31-10
| | Richard Taylor: And Djurhuus has beaten Kramnik! |
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| Jan-31-10 | | frogbert: and i have beaten djurhuus!! (only at 5 minute blitz though)... ;o) i guess that makes me better than both kramnik and kasparov, who are only equal to kengis. :o) |
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| Feb-01-10 | | Eduardo Leon: Black must prevent 18. c2, thus...
17... ac8!
Not 17... g5+?? 18.c2. Now white has several possibilities, but none of them saves him from disaster. Our rule is to always start with the lines in which the opponent plays as greedily (material-wise) as possible, thus... 18. xd7 g5+ 19.d3 f4 (19...c4?? 20. g1) 20.xf4 xf4 (20...xf4?? 21.f1) and mate next one. 
click for larger view18.f3 xf3 19.gxf3 g5+ 20.f4 xf4+ 21.d3 b5#. 
click for larger view18.f3 xf3 19.h4 f4 20.e4 xe4 and mate next one. 
click for larger view(continued) |
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| Feb-01-10 | | Eduardo Leon: (continuation)
18.b3 g5+ 19.d3 f4 20.xf4 xf4 (20...xf4?? 21.f1) and mate next one. 
click for larger view18.b3 g5+ 19.d3 f4 20.f3 e8 and mate next one 
click for larger view18.h4 f4+ 19.e1 xg3+ 20.d2 (*) f4 21.e1 xh4+ 22.xh4 xh4+ 23.d2 f4+ 24.e1 g3+ 25.d2 xe5. 
click for larger view(*) At this point, I'm almost sure there must be something better for black. |
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Feb-01-10
| | Richard Taylor: <frogbert: and i have beaten djurhuus!! (only at 5 minute blitz though)... ;o) i guess that makes me better than both kramnik and kasparov, who are only equal to kengis. :o)> Great one! He must be quite a good player - well more than quite good. Have you got the game? I beat a GM in 5 0 once on WCN. And in Master Challenge 3 0 - I had a draw with Susan Polgar. Mind you I lost the next game! In slow games I have drawn with about three IMs and won v two. (But that was in the 80s..the trouble is, recently I beat some FMs here) - but I then go and lose to very much lower rated players ... I seem to be able to play inspired one minute and then like an idiot the next... |
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Feb-01-10
| | Richard Taylor: Good analysis <Eduardo Leon> I saw a lot of this but there is so much to check out. The great move is 20 Be8!! At times also the R goes to f3 or takes the knight; also Rxc1 in some lines so that Black check mates on e3 etc I also was initially interested in a Q sac on e3 but couldn't get it to work!
I'm not sure black attack was "sound", but it was certainly inspired: and then rarely are such attacks water tight. |
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| Feb-01-10 | | gofer: I think I have seen this one before... ...or something very similar... Black has given up 2 N for 2 pawns and a good position. But that is not quite true. It is a fantastic position! All black has to do now is stop the king from escaping to c2 and then b1 and if black can do that then the mate threats are huge! 17 ... Rac8!
1) 18 Nxd7 Rf5 19 Qb3 Rd4+ 20 Qd3 (19 Ne5 Rd4+ 20 Nd3 Bg5#) Bg5 21 Kd1 Rxd3+ 22 Bxd3 Rxc1+ 23 Rxc1 Qd2# 2) 18 Nd3 Bg5+ 19 Nf4 Bxg5 20 Kd3 Bb5#
3) 18 Nd4 dxe4 19 h4 (Nxd7 Bg5#) e3+ 20 Kd3 Bb5+ 21 Kd4 Rf5# 4) 18 Rf1 Bg5+ 19 Kd3 Bb5#
The Main Line
18 Qb3 Qd4+
i) 19 Ke1 Ba4 winning the queen (20 Qd3 Qf2+ 21 Kd2 Bg5+ 22 Qe3 Bxe3+ 23 Kd3 Bb5#)
ii) 19 Bd3 Bg5+ (20 Ke2/Ke1 Qf2+ 21 Kd1 Rxc1+ 22 Rxc1 Qxd2#) 20 Kd1 Ba4 21 Qxa4 Qxa4+ 22 Ke2 Bxc1 23 Raxc1/Rhxc1 Qf5 winning
iii) 19 Qd3 Qxd5 and black is in deep trouble still! 19 Nd3 Ba4 (20 Qc3 Rxc3 21 bxc3 Bg5+ 22 Ke1 Qxc3 23 Bd2 Qxd2#)
20 Qa2 Rf2! (21 b3 Qc3+ winning and 21 Re1 Bg5# and 21 Rf1 Rc2+ 22 Ke1 Rfxd2 23 Nxd2 Qxd3 24 Ng3/Rf2 Bc5 mating) 21 Ke1 Rxe2+ (Kxd2 Qg4+ mating)
22 Nxe2 Qxd3
23 b3 Rc2
24 Qxc2 Qxc2 winning as Ra1 is going to fall cheaply... Time to check! |
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| Feb-01-10 | | frogbert: <Great one! He must be quite a good player - well more than quite good. Have you got the game?> gm rune djurhuus became european junior champion in 1990, ahead of amongst others kramnik. these days he's only a 2400-rated gm, though. rune and i play for the same club (and we're also colleagues working for microsoft-acquired search company fast in oslo). we've hardly ever played on the net, and i don't record blitz games played otb - so the few wins i have against the club's gm and (over time) couple ims are lost for eternity. but who cares! :o) |
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Feb-01-10
| | Jimfromprovidence: Just a footnote to this match...
...If white had not resigned and tried 21 Kd2, then we get the beautiful finish 21...Rd4#. 
click for larger view |
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| Feb-01-10 | | cyclon: Couple of adds; 17. -Rac8 18.Nxd7 Rf4 19.Qb3 Rd4+ 20.Qd3 Bg5+ three more moves are required in order to mate > 21.Kd1 Rxd3+ (Rxc1+?) 22.Bxd3 (Bd2 Rxd2X) -Rxc1+ 23.Rxc1 Qd2X. What slightly bothered me in the variation (while at the same time, as previously mentioned, admitting 20. -Be8 to be an excellent move); (17. -Rac8) 18.Qb3 Bg5+ 19.Kd3 Rf4 20.Nf3 R8c4, about the line 21.Bxf4 Bxf4, in which White plays 22.Qxc4 dxc4+ 23.Kxc4 (Kc3/c2 pawn-c4 stays alive in attacking purposes), Black can play King-hunt by 23. -e5 ( -Bxg3?! 24.Bd3 ) and that would be a new, unclear phase. |
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| Feb-10-10 | | LIFE Master AJ: Taking a quick break from my work ... I just now looked at this. I guessed 17...Rac8; (containing the White King, removing many of the King's flight squares) almost instantly. (I stll had many questions about the exact tactics, however.) |
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