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| Jul-25-13 | | Abdel Irada: Since I can offer no improvements, I'll not add anything to the many analyses already posted on this fairly forthright puzzle. But I will say that I recognized my old friend the Max Lange Attack (Marshall Variation) at a glance; the bishop on h6 and pawns on g5 and g7 are unmistakeable. Speaking as a Two Knights' player, it is always gratifying to see it taken down a notch or three. :-) ∞ |
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| Jul-25-13 | | Abdel Irada: That bishop on g5 has always cut both ways.
On the one hand, it is very secure there, and anchors the pawn on g7: all very useful if White can defang Black's counterattack. On the down side, the bishop not infrequently never moves again, so White often finds himself missing a defender when he needs it most. ∞ |
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| Jul-25-13 | | hms123: <Dom>
<Sweeper-sealer twist> Scroll down to page 155:
http://www.scribd.com/doc/36840791/... |
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| Jul-25-13 | | gofer: Well, at first I thought 40 ... Qxf2+ was a draw and 40 ... exf2+ 41 Qxf2 seemed too complicated,
and 40 ... Qg4+ transposed back to 40 ... Qxf2+, so I went back to look at 40 ... Qxf2+! <41 ... Qxf2+>
<42 Kh1 Qf1+!>
<43 Rxf1 cxb6>
Suddenly, black's connected passed-pawns are looking god-like! White's bishop is going nowhere,
so white is effectivley a bishop down! White probably resigns because the best white can hope for
is exchanging the rook for both pawns and that is going to be very difficult to achieve! I think
that a rook for one of the pawns is far more likely!
44 Rf8+ Nxf8
45 gxf8=Q+ Rxf8
46 Bxf8 d2 
44 Kg1 d2
44 Kg2 e2
45 Kf2? exf1=Q+
~~~
Yep... |
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| Jul-25-13 | | DarthStapler: Surprisingly I didn't get it although I really should have |
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| Jul-25-13 | | James D Flynn: White is 2 pawns down and Black threatens mate on c7 next move. However, Black has 2 advanced pawns which become 2 united passed pawns if he plays Qxf2+ next, and he can force the exchange of Qs by checking on the 1st rank and taking the White Q after the R takes his Q, if he does that with his united passed pawns not under attack he wins.
41…..Qxf2+ 42.Kh1 Qf1+ 43.Rxf1 cxb6 44.Rf8+ Nxf8 45.g6(if gxf8=Q+ Rxf8 46.Bxf8 d2 and Black will have Q versus B with an easiiy won endgame) d2 46.gxf8=Q+ Rxf8 47.Bxf8 Qd1=Q+ wins easily |
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| Jul-25-13 | | haydn20: < Once: You are standing in a dark cave. You are carrying a map, a lamp, a green key and a bird in a golden cage. There is an annoyingly random dwarf here. There are exits to the North and South. A brightly lit staircase leads down.
As a yoof I spent many a happy hour in places like this, cheerfully unlocking doors with obscurely coloured keys and cursing axe-throwing dwarves. For our younger readers, that was in a time after black and white but before yoofchoob and girls, when computers had less processing power than your fridge. Indeed the average computer had such limited memory that you knew each byte by name as if they were old friends.> Good God, my friend! You must be as old as I am to have played these games. Very humorous post & well-written. Are you old enough to have stood around the counter at 2 AM to await your printout from the mainframe CDC 6400?--btw, it took me a good half=hour of struggle w/o comp to find all the lines for the puzzle. |
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Jul-25-13
 | | Once: I came in on the tail end of mainframes, just as they were being replaced with PCs. There was something very relaxing about those days when you would write a program and submit it for an overnight run. It wasn't until the following morning that you would know whether it had worked or not. It has been fun watching the evolution of chess programs from the early days when it was hard to ind a program that could play, then one that could play well enough to give you an entertaining game, to the current day when they are just about too powerful even for the strongest GM. From first steps to supremacy. |
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| Jul-25-13 | | DcGentle: <Once: <From first steps to supremacy.>> I must say I like your post about text adventures, I know them too ;-) On the other hand, the current state of chess programming is not so much different from the one 10 years ago or even earlier, because the real engine deficits have <not> been removed. Hardware has improved a lot more than software has in this regard. But current engines cannot offer a draw nor start a Petrosian king's walk. To know what I mean, just play over Karjakin vs Deep Junior, 2004 with Houdini and compare the results. |
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| Jul-25-13 | | Marmot PFL: Taking into account the strength of connected passed pawns and the WB trapped on h6, the answer is simple enough to find - 41...Qxf2+ 42 Kh1 Qf1+ 43 Rxf1 cb6 with e2 and d2 as decisive threats. |
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Jul-25-13
 | | kevin86: Did I miss something?
My solution is 41...exf2+ 42 ♔f1 ♕h1+ 43 ♔xf2 ♕xc1 ...OO♙S,as you were-44 ♕e6+ wins the rook and the game |
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| Jul-25-13 | | JoergWalter: <kevin86: Did I miss something? My solution is 41...exf2+>
Most certainly. (regarding the question) |
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| Jul-25-13 | | TimothyLucasJaeger: @kevin86 Yes, you missed 41 ... exf2+ 42 ♕xf2 If white were to play 42 ♔f1 then 42 ... ♕e2+ 43 ♔g2 f1=♕+ will lead to mate shortly I was stumped on this one. Unbelievably i found 41 ... ♕xf2+ 42 ♔h1 ♕f1+ 43 ♖xf1 only to completely miss that black could then take the queen. Instead i could find no better try than 43 ... e2 which loses to 44 ♕e6+ so i figured i would settle for the perpetual. |
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| Jul-25-13 | | lost in space: For me it was not easy to see the solution, because I thought first, that 41...exf2 foces 42 Kf1, not recognizing that 42. Qxf2 is possible. After I was looking to the positon after 41...exf2+ 42. Kf1? Qh1+ 43. Kxf2 Qxc1 I first thought this is an easy win for Black, but than I saw that White has 42...Qe6+ getting the Black rook on g8 and the position is not at all promsing for Black (to say it mildly) So after all that I had to go back to 41...Qxf2 (the move I liked most from a positional point of view), but it took me a while to see 42. Qf1+!! keeping the mosnter passed pawns and allowing to take the white queen with cxb6 |
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| Jul-25-13 | | patcheck: An interesting position :
41. … Qxf2+42. Kh1 Qf1+ ! 43. Rxf1 cxb6
A) 44. Rc1+ Kc7 (for instance) and black will promote, for example : A1) 45. Rc3 d2 46. Rd3 e2 and black promotes next
A2) 45. Kg2 d2 46. Rd1 e2 and black wins
B) 44. Rf8+ Nxf8 (or Rxf8 but not 44. … Kb7 because of : 45. Rxg8 d2 46. Rd8 e2 47. g8 = queen) 45. gxf8 = queen + Rxf8 46. Bxf8 d2 (not 46. … e2? 47. Bb4) and black promotes next C) 44. Kg2! e2 (not 44. … d2 45. Kf3) 45. Rf8+ Nxf8 46. Kf2 (white can’t play 46. gxf8+ because the white king would be in check) 46. … Ng6 followed by 47. … Re8 and black wins easily |
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Jul-25-13
 | | Domdaniel: <Once> In 1978 -- *only* 35 years ago -- I saw an advert for "programmable home computers" in, I think, Omni magazine. Naturally I had to have one -- it was just what I'd been waiting for. So I got a Commodore Vic-20, with 3K memory ... and I've been using computers ever since. I'm both underwhelmed and overwhelmed by the result. |
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| Jul-25-13 | | catlover: <Once> Yes, I'm among that group that can remember those old text-based games. They were fun, though, and required that we use our imagination. Funny, though, I never thought Zork could actually serve as a parable for how to solve a chess problem. You wove that together nicely. |
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Jul-25-13
 | | Sneaky: Quote of the day: <It is well known that two pawns on the sixth rank are stronger than a rook.
--- Du Mont> |
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| Jul-25-13 | | PinnedPiece: <haydn20: < Once: You are standing in a dark cave. You are carrying a map, a lamp, a green key and a bird in a golden cage. There is an annoyingly random dwarf here. There are exits to the North and South. A brightly lit staircase leads down.. .. For our younger readers, that was in a time after black and white but before yoofchoob and girls, when computers had less processing power than your fridge. ...> Good God, my friend! You must be as old as I am to have played these games. Very humorous post & well-written.> Ditto to <haydn>. <Once>: Worth the time to read and understand. . |
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Jul-25-13
 | | hoodrobin: Good old days... in many respects.
Speaking about 60s and 70s
(40s and 50s I was too young a boy). |
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| Jul-25-13 | | k.khalil: Qxf2+
Kh1 Qf1+!
Rxf1 cxb6
The two passed pawns on the 6th rank are dangerous.
Took be 10 minutes to find this combination! |
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| Jul-25-13 | | k.khalil: Why didn't white take the pawn on d4 by move 4?
By move 11, three of blacks heavy pieces protecting the d4 pawn. Black's position by move 11 is strategically superior. Two passed pawn on the fifth rank, connected rooks, and all pieces mobilized. Why did black play 17...Rd3? He lost a pawn. |
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| Jul-25-13 | | BOSTER: <Once: From first steps to supremacy>. Here a couple words about <supremacy>.
This is the pos. Deep Junior vs Deep Fritz. White to play Move 70.
click for larger view White chose an astonishing way to win playing 70.Rc6+. Instead of trying to win with an extra rook, he "gave up" the rook only to reach his goal playing with 5 pieces thanks to the database.
And be sure he reached his goal, after 74 Rc5+ forcing black into the database and won on move 109. This is how looks <supremacy> today. |
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Jul-25-13
 | | Phony Benoni: <k.khalil> This entire opening sequence, called the Max Lange Attack, is a well-known and heavily-studied variation. It is highly tactical in nature, with numerous traps available. I played it with both colors, and it is one of the reasona I always brought headache medicine to tournaments. <4.Bc4>, known as the Scotch Gambit, is a typical material-for-development speculation in the opening. Black can steer into quieter lines with 5...Nxe4; after <5...Bc5 6.e5 d5> both sides have signalled their willingness for a fight. <12.g4> may be the most double-edged move in the opening. Black does have an extra pawn and a strong center, so sharp counter-measures are justified. However, the hole on f3 and the unavailablity of g2-g3 are drawbacks. While the Black d-pawn is strong, the White g-pawn must not be underestimated. It is a potential threat to promote, and also keeps the g-file closed in front of White's king. Note that White cannot play 17.Nxd2 immediately because of 17...Bxf2+ 18.Kxf2 Qxh2+ in reply. Cheapos like that are everywhere in the Max Lange. <17...Rd3> is a good idea for Black. It brings the rook to a strong square, from where ...Rh3 is a possible threat. The d2 pawn cannot be saved in the long run. That also marks the point where theory begins to fade away, and the opponents must start playing chess. To my mind, Black plays this very well; not the continual use of the light squares around White's king. By the way, if White's ♗h6 looks like an idiot, take a look at this game. For a while, it was thought to refute the Max Lange for Black: Marshall vs Tarrasch, 1910 |
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| Aug-11-20 | | Lossmaster: "Moore Correspondence to Read" |
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