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Later Kibitzing> |
| May-05-13 | | cadwallon: I went for <M.Hassan>'s line but I think I can now see why it doesn't work, as after <60.........Nxb3
61.Rxb3 Kxa4
62.Rb1 b3
63.Ra1+ Kb4
64.Rxa6 Kc3>
white has
65.Rxd6 b2
66.Rb6 Kc2
67.Nd7 b1=Q
68.Rxb1 Kxb1
69.Nxc6
and black has won the exchange but has given away too many pawns to have winning chances. White also might be able to get a draw with something like 64.Ng4 making use of his control of the 1st rank, and if 64.....b2
65.Rb1 Kc3
66.Nxh2 a5
67.Nf1 a4
68.Ne3 a3
69.Nd1+ Kc2
70.Rxb2+ axb2
71.Nxb2 Kxb2
looks like a draw. |
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| May-05-13 | | offramp: 61...Rh1 is a cracking move - easily missed. |
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| May-05-13 | | david p: Yogi Darwin I agree. Better to solve the problem as it appears |
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| May-05-13 | | James D Flynn: Material is equal but Black’s R controls the only open file , however Whit’s position looks currently well defended and His N is free to attack the base of the Black pawn chain by Ne8. Black can defend the d6 pawn by 60…..Kb6 61.Ne8 Kc6 but his position is then very passive and a draw appears likely. White can plan to challenge control of the h file by 61.Ng4 Rh8 62.g3 and Kg2 then maneuver his N to d2 via e3 , f1 then play Rh1 once the White N defends the b3 and f3 pawns attacked by Black’s N the action could move to the K-side where the pawn on g6 looks vulnerable to an advance by White’s K.
60…..Nxb3(strike while the White K is far from the action) 61.Rxb3 Kxa4 62.Rb1 b3 63.Ra1+ Kb4 64.Rxa6 b2 65.Rb6+ Kc3 66.Kg1(else 61…Rh1 supports the pawn push ) Rh8 67.Ng4 Kc2 68.Ne3+ Kc1 and there is no way to stop the Black pawn queening forcing 70.Rxb1+ Kxb1 after which Black will attack the White pawn on d3 therefore White must try passive defense 69.Nd1 b1=Q 70.Rxb1 Kxb1 71.Nf2 Kc2 72.Kf1 Kd2 73.g3 Ra8 74g4 Ra1+ 75.Kg2 Ke2 76.g5 Ra2 77.Kg3 Ke3 78.Ng4+ Kxd3 79.Nf6 Kxc4 80 Nh7 Ra8 and White has no way to attack the Black pawn on g6 while the Black K escorts the c pawn to queen. |
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May-05-13
 | | chrisowen: Sob I got it is the old hone free titter serious in, business at hand cob building dams it turf over mind ratchet it claw backer mitigate in foilable, 60...Nxb3 light you up in b1xb3 all of the wild,
dreamer dob in knight it's seem like for one moment it tether a 61.Rxb3 you seek learn the ropes h1 the key maneovre it her bind along first at ron lance, b3 us sacrifice bold he gallant it try in a4 be a kings waste again gg bin hooded a 61...rh1 bull it shine out it now in alive I ok narrows another matrix in chip have rook too knight off in b3 ar, the wheel one hundred and eighty mode ala tin tithe just again boomed to 62.rb2 rook river sat I light you lip 1h a1 ramble ok 62...ra1 doctor eyes, a4 drakes man garden off 63.f4 as far as put in feed a5 down in a4 blinding b3 ar a6 in should, promote a path why it is turmoil calming Buenermann viva cage it shin a3 or f6 foil cold b3! |
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| May-05-13 | | BlackSheep: Nxb3 , Rh1 , Ra1 , Kxa4 seems to be the plan I think but the myriad of variation after that I cant calculate , the white knight seems pretty impotent to the passed pawns strength though . (I've looked at the game now) If black calculated all that to the finish he is an utter genius otherwise he has a good feel for the position and was willing to fly by the seat of his pants plus I dont think its as insane as billed because Nxb3 is the only move that changes the position dramatically , its choices that make a puzzle insane and this one is lacking them that said I still enjoyed it muchly . |
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| May-05-13 | | newzild: I found the plan with Nxb3 and Rh1, but I only spotted it after trying to force zugzwang somehow so that White would have to play Rd2, letting Black's rook into h1. Still, a very easy Sunday. |
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May-05-13
 | | Jimfromprovidence: I see nobody looked at 63 d4?!
click for larger viewI like this move because it gives the white rook room to maneuver. I don't know if it prevents a win, but I can't find one yet. |
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| May-05-13 | | master of defence: Wouldn't 73.e5 draw the game? |
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| May-05-13 | | shivasuri4: <master of defense>, 73.e5 Rb1 should win for Black, with White unable to stop the a-pawn. |
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| May-05-13 | | Patriot: 60...Nxb3 looks to be a good sacrifice.
61.Rxb3 Kxa4 62.Rb1 Ka3 63.Ng4 Ka2 64.Nxh2 Kxb1 65.Nf1 Kc1  61.Rxb3 Kxa4 62.Rb1 Ka3 63.Ng4 Ka2 64.Rg1 Rh4 65.Ne3 b3 61.Rxb3 Kxa4 62.Rb1 Ka3 63.Ng4 Ka2 64.Re1 b3 looks winning I'm sure there are other tries. Perhaps 60...Nxb3 61.Rxb3 Rh1 is even better and clearer. In that case, 61.Kg3 or 61.Kg1 or 61.Ng4 are other options. 61.Kg3 Kxa4 looks really good. The same goes with 61.Kg1 and 61.Ng4 looks to be no better. |
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| May-05-13 | | Patriot: <Abdel Irada> <"Insane" this puzzle isn't, but I rather like it just the same. The sacrifice that begins the action might be considered a positional one, for principle rather than calculation tells you it is good.> I couldn't agree with you more! I missed a critical move (60...Nxb3 61.Rxb3 Kxa4 62.Rb1 Ka3 63.Ra1+) which gives white counter-play. But I'm not too disappointed because it's very tough to see how white is going to survive. It's pretty impossible to calculate this to the game line because the move played, 63.f4, isn't that critical to see. |
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May-05-13
 | | Sneaky: I feel like I pretty much got the idea but I was planning 62...Kxa4 instead of 62...Ra1. I see now ...Kxa4 allows an annoying check. Is 62...Ra1 an "only move"? |
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| May-05-13 | | Patriot: <Sneaky> Houdini says 62...Ra1 is the only winning move--62...Kxa4 is even. |
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May-05-13
| | Jimfromprovidence: Beside the aforementioned possible defense of 63 d4?!, there is is also the stronger perhaps defense of 61 Ng4!?
click for larger view Now the black rook may never get to the first rank. |
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| May-05-13 | | patcheck: Idea of variations after 60. ... Nxb3 61. Ng4 :
61. ... Nd2 62. Rd1 Nxf3?!
Here, two principal options I think: 63. Kxf3 or the most natural 63. Nxh2. I want to look at this one.
So : 60. ... Nxb3 61. Ng4 Nd2 62. Rd1 Nxf3 63. Nxh2 Nxh2 64. Kg3 (seems forced in order to avoid the knight escaping from h2).
64. ... Kxa4
Here there are two options I think:
65. Kxh2 or 65. Ra1 Let's look the second option.
65. Ra1 Kb3 66. Kxh2 (I think that 66. Rxa6 is bad because the knight can escape -66. ... Nf1 and with the king on b2 or c2, I think that black will hace to exchange the rook against the b pawn). 66. ... Kb2 67. Rxa6 (maybe is not the best) 67. ... b3 68. Rxd6 Kc2 69. Rb6 (the are other options) ... b2 70.Kg3 (maybe) ... b1=Q 71. Rxb1 Kxb1 72. Kf2 Kc2 73. Ke2 (or Ke3) g5! 74. Ke3 Kd1 and black wins a pawn and the game. |
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May-05-13
 | | OhioChessFan: <JFP> 61. Ng4 Nd2 for sure. Then I think 62. Rd1 and I need to look at it. 62...Nxf3 looks like the only winning chance. |
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| May-05-13 | | njchess: Once I figured out that Black's rook had no active moves, the puzzle became pretty easy. It immediately amounted to a knight exchange for two pawns, a passed pawn and Black's rook on the 1st rank with Black's king nearby. Nice position to win the promotion race! |
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May-05-13
| | OhioChessFan: <60. ... Nxb3 61. Ng4 Nd2 62. Rd1 Nxf3 63. Nxh2 Nxh2 64. Kg3 (seems forced in order to avoid the knight escaping from h2> I don't think that's necessary.
60...Nxb3 61. Ng4 Nd2 62. Rd1 Nxf3 63. Nxh2 Nxh2 64. Ke2 Kxa4 65. Kd2 Kb3 66. Rb1+ Ka2 67. Kc2 and White seems okay. Black is definitely going to have to back his King out the a file.
click for larger viewI am leaning toward the thought 60. Ng4 saves White's game. |
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May-05-13
| | OhioChessFan: * Previous post I am leaning toward the thought 61. Ng4 saves White's game. |
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| May-05-13 | | bubuli55: White perhaps has a chance with 69. Nd7 a5 70. Nxe5 a4 71. c5 a3 72. c6 a2 72. c7 Rc1 73. Nc4+ Anyways, Nxb3 then Rh1 is screaming :) |
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| May-05-13 | | bubuli55: Ok. After 70. Nxe5 there's ... Rc1 :) |
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| May-05-13 | | M.Hassan: <cadwallon>:I went for <M.Hassan>'s line but I think I can now see why it doesn't work, as after
<60.........Nxb3
61.Rxb3 Kxa4
62.Rb1 b3
63.Ra1+ Kb4
64.Rxa6 Kc3>
Right. One important move was missed in my line: Rh8 as in followings: 60............Rh8
61.Nd7 Nxb3
62.Rxb3 Kxa4
63.Rb1 b3
64.Ra1+ Kb4
65.Rxa6 Kc3
<if 66.Rxd6 Rd8 and either Rook or the Knight will be taken later> 66.Nb6 Kxd3
67.Nd7 b2
68.Rxd6+ Kxc4!
69.Rb6 Kc3
70.Nxc5 Kc2
71.Nd7 b1=Q
72.Rxb1 Kxb1
73.Nxe5 Rg8
Now, Black is more likely to win the game |
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May-06-13
| | OhioChessFan: I think this is cooked. Anyone got a winning line for Black after 61. Ng4? |
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| May-06-13 | | gofer: <OhioChessFan: I think this is cooked. Anyone got a winning line for Black after 61. Ng4?> Yep... ...ignore Ng4...
60 ... Nxb3
61 Ng4 Nd2
62 Rd1 b3
White seems to only have two alternatives and both allow
Kxa4 winning ...
a) Leave the first rank...
63 Rxd2 Rh1
b) Take the rook but be forced to trade back the rook for the
pawn...
63 Nxh2 b2 |
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Kibitzing
sac: 60...Nxb3