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| May-24-12 | | JohnRed: What's the refutation for 47. QB4 with the dual threat of queening and mate on e7? I'm pretty sure there's a perpetual for black but I can't find it. |
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| May-24-12 | | doubledrooks: I found the game continuation through 51. Nxb5, but I certainly didn't find the instructive endgame win Rybka found from 51...a6 through 66. Nd5. |
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May-24-12
 | | Tiggler: <Once: Do you believe in ghosts? ...>
I enjoyed this post too. It shows a lot of chess insight, and thanks for mentioning Nimzo. I'm sure he would have loved it. |
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May-24-12
 | | kevin86: Between moves 47 and 51,white sacrifices TWO queens and ends up a knight ahead. Black's play is inferior after that as he doesn't try to help his lone queenside pawn alone or try to stop white's trio on the king side. His game is lost,but he did have a punchers chance to draw. |
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| May-24-12 | | dragon player: I had to look for a while, but than I found this:
47.Qb5! Qxb5
Black doesn't have much choice, If 47...Kd7 48.Qxc6+
Kxc6 49.c8(Q)+
48.c8(Q)+ Kf7
If 48...Nd8 49.Nc7+, winning the queen
49.Qxe6+! Kxe6
50.Nc7+ Kd5
51.Nxb5
and white is a knight up.
Time to check.
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Indeed right, black played on for a quite long time.
4/4 |
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May-24-12
 | | Pawn and Two: <LoveThatJoker> In your variation 47.Nb4 Qd7 48.Na6, did you find a winning continuation? White is better, but after 48...Qd2+ 49.Kh3 Qd7, the ending looks very difficult to win. |
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May-24-12
 | | Jimfromprovidence: <RandomVisitor>
<Rybka 4.1 x64:>
<[+2.88] d=28 51...a6 <52.Nc7> a5 53.Kf2 Kd4 54.Ke2 a4 55.Kd2 Ke5 56.Kc3 g6 57.Na6 g5 58.Nc5 a3 59.Nd3+ Ke6 60.g4 f5 61.Kb3 fxg4 62.fxg4 Kd5 63.Nb4+ Ke5 64.Kxa3 Kf4 65.h3 Kf3 66.Nd5 <Kxh3>>
click for larger view
From the above continuation by <RV>, here’s one for all of you endgame phobics. It’s white to play and win. It leads to mate in 26 moves. Here is your answer key.
http://www.k4it.de/index.php?topic=... |
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| May-24-12 | | BOSTER: When you are fighting against the knight , at least don't put all your pieces on the squares the same colour. Ater 47.Qb5 Qxb5 all black pieces Ke8,Qb5 and Ne6 create the triangle where they can be <hit> by the white knight from c7.
48.c8=Q+ if ...Nd8 49.Nc7+ if 48...Kf7 49.Qxe6+ Kxe6 50.Nc7+. |
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| May-24-12 | | poszvald: Somebody can tell me, why blacks 65th move is not a5? I think with that black can hold draw. Or I see something wrong? |
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| May-24-12 | | mikmik777: White to play: 47.?
Zukertort vs Englisch
"Medium"
<47.Qb5 Qxb5>
47... Kd7 48.c8(Q)+
<48.c8(Q+) Kf7>
48... Nd8 49.Nc7+ forking Black's King and Queen
<49.Qxe6+ Kxe6 50.Nc7+ and 51.Nxb5> With a very easy endgame |
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| May-24-12 | | Virgilio Jacobus: <poszvald> After 65...a5 66.Ne4+ gains the vital tempo by giving check. The knight then has time to take the f-pawn and come back to stop the a-pawn. |
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| May-24-12 | | EXIDE: Try as I might I cannot get a white win against 51. ---,a5. The black king moves in support of the (a) pawn and the white knight is lost in defense. I would like to see the moves if anyone has looked at this position. |
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| May-24-12 | | uscfratingmybyear: <JohnRed> I think Qb4 is met by 47...Kd7, after 48.Qe7+ Kc8 and the c7 pawn is ganged up on. Or 47. Qb4 and 47...Kd7 followed by 48.Q b8 then ktxc7 and black looks okay. |
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May-24-12
 | | David2009: Zukertort vs Englisch, 1883 White 47:
click for larger view
Seeing the combination that won the N was the easy part - I decided, exceptionally, to set up the ending straight away (before reviewing the game and drafting my solution in Notepad) to see if I could win the ending against good defence (Crafty End Game Trainer). I repeatedly failed to find the win. Here's the link:
http://www.chessvideos.tv/endgame-t...
Crafty varies from the game line with 51...a5! After a large number of false starts I finally found a winning plan: head towards a1 vie e2 and use the N to grab a Pawn. The EGT playing Black defended with 51...a5 52.Kf2 Kd5 53.Ke2 Kc4 54.Nd6+ Kc3 55.Kd1 g6 56.Ne4+ to reach
click for larger view
Here the EGT surprised me by wasting a tempo: 56...Kb3!? allowing 57.Nxf6 Kb2 58.Nd5 a4 59.Nb6 a3 60.Nc4+ Kb3 61.Nxa3 Kxa3 62.Kc2 Kb4 63.Kd3 and the K&P ending is not too difficult to win. But what happens if Black plays 56...Kb2 directly? What had the EGT seen that I had missed? Here's a further Crafty link to this variation:
http://www.chessvideos.tv/endgame-t...
Congratulations if you can find the win without silicon asistance! I gave up and had to be shown the winning plan by Fritz. |
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| May-24-12 | | solskytz: <once> but he has - and especially to ghosts of knights! At one point in his game, an opponent demolishes one of his knights, because he's afraid that the knight, the opening being a sicilian, will maneouver his way to c4 with devastating effect. Nimzowitsch then comments "I could have supplied him with yet another ghost by playing" the other knight in a way that he, also, starts maneouvering towards that very square! |
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| May-24-12 | | LoveThatJoker: <Pawn and Two> Stockfish confirmed my idea that 48. Na6 is the best try to avoid repetition after 48. Nd5 Qc6 - if White does not wish to go into the game continuation that is. I cannot possibly disagree with you when you say that the ending is difficult to win as it also is with the actual game continuation. Your message to me just adds credence to my argument that this is not the best puzzle for a White to play and win scenario. LTJ |
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May-24-12
 | | Patriot: Tough problem! First I had to get past 47.Qb8+, including the line 47...Kd7 48.c8=Q+ Qxc8 49.Qxa7+ Kd6. I thought about <47.Qb5 Qxb5 48.c8=Q+ Kf7> and for a while I didn't see <49.Qxe6+! Kxe6 50.Nc7+ and 51.Nxb5  >.This is a good one! |
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| May-24-12 | | CHESSTTCAMPS: In this endgame position, material is even, but the advanced c-pawn and the move certainly look to be winning advantages. I looked at 47.Qb8+ Kd7 where the best continuation I can find is 48.c8=Q+ Qxc8 49.Qxa7+ Kd6! - the *only* saving move and it looks like a draw. I also looked at 48.Nb4 (to try to overload the queen), but black seems to hold with 48...Qd7. So my preferred continuation is 48.Qb5! (winning a piece) Qxb5 49.c8=Q+ Kf7 (... Nd8?? 50.Nc7+) 50.Qxe6+ Kxe6 51.Nc7+ Now black looks to have drawing chances with either 51...Kd7 or Ke5 (but not 51... Kd6?? 52.Nxb5+ wins, getting rid of the troublesome a-pawn immediately) 52.Nxb5 a6 and I am not going to try to analyze either ending from the diagram. However, I would like a shot at playing Crafty EGT from the game position. Time for review... |
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May-24-12
 | | JohnBoy: <Random, Jim> - after 51...a6 is 52.Nc7 best? I'm looking at 52.Na3 with the plan of giving up the knight for the a pawn when black's king gets over to the queen side. Particularly with Na3-b1, black's king comes to b2, and white plays Nd2-c4+ when black pushes the pawn to a3. Is it known that the king can force the pawn through against a lone knight? |
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| May-24-12 | | chopin4525: I got this right according to Zukertort and his game combination but when I analyzed the entire game with Houdini I saw this: Analysis by Houdini 2.0c Pro w32:
1. (#14): 1.Qa4+ Kf8 2.Qb4 Qxb4 3.c8Q+ Kf7 4.Qd7+ Kf8 5.Nxb4 Nc5 6.Qd6+ Kf7 7.Nd5 h5 8.Qe7+ Kg6 9.Qe8+ Kf5 10.g4+ hxg4 11.fxg4+ Kxg4 12.Qg6+ Kh4 13.Ne7 a6 14.Nf5# 2. (1.47): 1.Qb5+ Qxb5 2.c8Q+ Kf7 3.Qxe6+ Kxe6 4.Nc7+ Ke5 5.Nxb5 a5 6.Kf2 a4 7.f4+ Ke6 8.Ke3 g5 9.Kd4 gxf4 10.gxf4 a3 And I'm like "What?" O__o"
Yeah, this is a "medium puzzle"...You need supernatural power like Houdini to imagine there is a continuation infinite times better than the one you and Zukertort found out. My low self esteem grew up enough today. :( |
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May-24-12
 | | Moonwalker: Thanks <scormus>. Yeah not looking forward to the weekend! I'm actually not all that new to the site, been visiting for years, I just didn't post much :-) |
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May-24-12
| | Jimfromprovidence: <JohnBoy> <after 51...a6 is 52.Nc7 best? I'm looking at 52.Na3 with the plan of giving up the knight for the a pawn when black's king gets over to the queen side. Particularly with Na3-b1, black's king comes to b2, and white plays Nd2-c4+ when black pushes the pawn to a3. Is it known that the king can force the pawn through against a lone knight?> I like your strategy, but I do not think that 52 Na3 is a good idea to go about it because after 52...Kd4 black's king is in better position than white's king. 
click for larger viewBlack can even try to trap the knight as b5 is closed off, so your scenario where black's king is on b2 and white can check on c4 and win the pawn on a3 might not be achievable. I think that white's knight has to stay out of trouble on the upper side of the board to succeed in the plan you've outlined. I did not verify RV's analysis. I adopted it because his Rybka work has proven to be unfailingly accurate in the past, time after time. |
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May-24-12
| | Patriot: <Jimfromprovidence> <From the above continuation by <RV>, here’s one for all of you endgame phobics.> I took the easy way out, looking for the best move. 67.Nf6 is the only attempt to win. 67.Ne3? probably draws since it puts the pawn defender within target distance of the king. |
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May-24-12
| | JohnBoy: <Jim> - I certainly thought about knight traps. After 52...Kd4 53.Kf2 Kc3 54.Ke3 (or e2) Kb3 (not ...Kb2 55.Nc4+ & N-a5-b7 and white has much more freedom to give up the knight at a convenient time) 55.Nb1 and we are headed to exactly the situation I foresee. The knight can go to d2. I don't know if black can keep white from giving up the knight, and now the black king is away from the k-side. |
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| May-24-12 | | stst: Waited too long, I'd opted for Qb8+ to start some fire... |
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sac: 47.Qb5
