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PAMetalBoss

Seen above is a tactic I encountered today. I don't understand it. The correct solution is given as follows:

1. Nxe5 Qxe2

2. Rf7+ Kh6

3. Rh8+ Kg5

4. Rg8+

White draws the game by perpetual check. I can't understand white's first move. Why did he have to look for a draw? The problem # is 0025025

NimzoRoy

Since you went to the trouble of posting a diagram next time make it interactive - you'll get more interest and responses when people can "move the pieces around" as they examine the position or puzzle. Also give a link to the page making it easier for us to look it up, I didn't bother doing so to make sure you copied the position and moves correctly (nothing personal, but that's why you gave the problem # right?)  BTW I believe you can discuss each TT position on the same page, but maybe no one else did so far? Here's my take on this position:

PAMetalBoss

I'm just shocked that there were 3 pages of comments discussing the problem and no one questioned the first move. No one asked about Kf2, which is what I chose. The analysis board was totally empty. 

You still have not explained the rational behind white's first move!!

NimzoRoy

White to move and win right? Because Black is practically 2 pieces down - his QR and KB are misplaced, his KR is almost trapped and his King is out in the open one rank away from one White Rook and one file away from the other one. White's Queen and Kt are also perilously close to the Black King unlike Black's QR and KB. This is all the explanations I need here now it's time to either checkmate Black or force a draw if there's no checkmate AND no win of material.

My posted analysis is my "explanation" for 1.Ne5, since I found a few ways to checkmate Black beginning with this move. It attacks the enemy Queen AND permits Rf7+ beginning a mating attack or else wins after 1...de5 2.Qe5+ (according to me that is). 

I started to investigate your move 1.Kf2 which i initially thought loses automatically but on 2nd thought it seems to be quite complicated. Since it's your move why don't you post your analysis showing how it wins for White? (Or draws if that's what this TT called for) Or else go thru my analysis and point out any errors, I don't claim to be Tal Jr when it comes to tactics. 

It also wouldn't hurt if you cut and paste whatever the heck the official solution is, who knows maybe I'll end up looking like a shmuck here (and not for the first time either)Tongue Out

PAMetalBoss

No, not white to move and win. The idea behind the problem, according to the tag and those who were commenting, was that the best white could do was force a stalemate from the given position. I wanted to know why white couldn't win from this position.  

I did post the "official solution". Those moves I wrote were the moves the tactics trainer had placed into the problem. 

Also I'm having trouble when it comes to pasting a board on this page, I don't know quite how to work it, so I apologize for that. 

NimzoRoy

Read these articles they've got everything you need to know about posting diagrams and using the Board Editor:

http://support.chess.com/Knowledgebase/Article/View/148/0/how-do-i-use-the-analysis-board--editor

http://www.chess.com/article/view/how-to-use-the-chesscom-diagr

BTW I still maintain the perpetual check solution is wrong and my checkmates are right - using their solution as the beginning of my mating attack

PAMetalBoss

I don't know how to do this, but maybe you do...if you want to go and examine the tactic, are you able to get back to it by knowing the number? I already looked at it but maybe you want to go to it yourself, if you can that is. Like I said the # was 0025025

AndyClifton

I have a lingering suspicion that this set-up is not the right position...

duck_and_cover
  1. NimzoRoy is correct, White wins. Just a nit: 5.Kg3 Nxe7+!, and not 5...Nf4+? 6.Qg4.
  2. 1.Kf2 is easily refuted with Rxf3+ and Qxc8.
AndyClifton

Ah, I didn't even notice that the rook was hanging! lol

PAMetalBoss

I checked it and double-checked it, the position is correct. White does not win, white forces black into perpetual check. White only can win in this position if black makes a mistake. 

I looked more deeply into it and I finally understand. Surely it was one of the most difficult tactics I've come across though. 

JG27Pyth

@Nimzo -- In your analysis, black's move 5... "Kg5 or Kg4 or Kg3 it makes no difference." I think it does make a difference ---> 5...Kg4 6.Nf4+ Bg5  and it's not over. 

john272

 you are not giving a win in the total only giving me lost total

NimzoRoy
JG27Pyth wrote:

@Nimzo -- In your analysis, black's move 5... "Kg5 or Kg4 or Kg3 it makes no difference." I think it does make a difference ---> 5...Kg4 6.Nf4+ Bg5  and it's not over. 

It looks over to me:

5... Kg4 6. Nf4+ Bg5 7. Nxe2 Rd3?? 7... Kh4 8. gxh3and wins with an extra Rook  ) 8. Rf4# )

JG27Pyth
NimzoRoy wrote:
JG27Pyth wrote:

@Nimzo -- In your analysis, black's move 5... "Kg5 or Kg4 or Kg3 it makes no difference." I think it does make a difference ---> 5...Kg4 6.Nf4+ Bg5  and it's not over. 

It looks over to me:

5... Kg4 6. Nf4+ Bg5 7. Nxe2 Rd3?? 7... Kh4 8. gxh3and wins with an extra Rook  ) 8. Rf4# )

Neither 7...Rd3 nor Kh4 make sense; I think you missed the discovered attack on the white rook that makes Bg5 work. 
 


The more I look at the end position above the more I think black is very strong if not won, and that perhaps 5...Kg4 and 6...Bg5 refutes your (interesting and fun to chew over) idea, Nimzo. 




.... 

NimzoRoy

JG27Pyth    

JG27Pyth

But the party's over! 

 
NimzoRoy

Yeah good point well I need to start following the same advice I give some local patzers and start looking at all 64 sqs before I make any hasty conclusions

x-5058622868

After the move 4...Kh4, i think white's best move is 5. Rf4+. Black has no choice but to respond with 5...Qg4. It seems white would be up an exchange after 6. Nxg4 with the threats of mate and gxh3.

Dutchday

I think the line with Ng6xe7+ Kh4 Rf4+ Qg4 Nf5# may have been missed. Doesnt work against Kg3, but it still looks good I think.