CHESS PUZZLE, FEN 3rb1N1/4N3/1p3p2/1Pp3k1/2r1p3/4P3/3BB2P/7K w - -

Added by:ralbama1
Added on:05-Jun-08
Description:
Difficulty:
chess puzzle 3rb1N1/4N3/1p3p2/1Pp3k1/2r1p3/4P3/3BB2P/7K w - -
Attempts:1486
Solved:944 (63%)
White to move, mate in 2
Comments: (14) » LastGo to last comment
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bobandyo
14-May-12, 07:18

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Given how few options you have on getting a check on the black king by the second move the puzzle solved itself
fezzik
14-May-12, 09:41

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I rather liked this.
A few weeks ago, someone tried to explain how they solved puzzles. I disagreed with them.

I use several methods to solve a puzzle. The first one is AAFMF, borrowed from John Nunn. I always analyse forcing moves first. I look for checks and ways to sac material first.

That took a few seconds.

When that doesn't work, as in here, I then look to see what legal moves the Black king has. Here, Black's king has only one legal move. So, I just needed a way to eliminate that and deliver check.

I found the correct move almost instantly, but I didn't make the move until I verified there was no way for Black to interfere with my planned move.

There are other techniques I use if those two aren't enough, but those first two rules help me to solve the vast majority of puzzles here very quickly.

I didn't time myself, but I estimate the entire process took ~30 seconds.

I gave the puzzle three stars because it required a second level of analysis to solve it. But it has a 64% solve rate, so it wasn't too difficult.

Regarding forcing moves... It's amazing how often forcing tactics are available in real games if only we look for them. GM Alexander Yermolinsky recently said that people rarely believe that the tactics they see in puzzles could occur in their own games. If you look for them, you'll find them!
blackmonkey
14-May-12, 10:18

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Applause for Sir Fezzik!!
blackmonkey
14-May-12, 11:19

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Gameknot Case #27
I must say, fezzik, that while impressive and colorful, your analysis is not sound! Though one can easily see how thorough it is, a closer look will reveal holes in the plot, so to speak.

You mentioned that the first step of analysis is looking for forcing moves, checks and ways to sacrifice material to an advantage. You also mentioned that in the case of this puzzle, this first step would not work.

It does work, my dear friend fezzik!

Clearly, I would not challenge your person and the ability you possess to solve chess problems since I know you slay puzzles with ease. I only wish to argue that the above outlined definition of your thought is almost complete, after only a few modest adjustments be made.

There is one move you may have overlooked that is definitely a forcing move and also sacrifices material, h4+. That much is apparent. Before I thought about making any moves, however, I also noticed (as you also mentioned elsewhere) that the Black King's only available move is to h4. Then, I did exactly as you did; used Nunn's methodology. The truth was that no other White piece could check the king, forcing him to move, other than the h-pawn. In my mind I made the move, knowing the Black King's only choice was to capture. All of this being a logical, one-step-at-a-time process, I mentally played this move out not yet knowing how feeble an attempt this would be to win the puzzle. With only one move left, the next move would have to be a check. Two checks were available, one with Knight on e7 and other with Black-square Bishop. Unfortunately, knowledge of these available checks proved to be useless, as the conscientious player would see that Black King now had two open squares free to occupy. Thus, an early check and sacrifice with the h-pawn becomes fruitless and to no advantage in White's second move, yet does fulfill the requirements of AAFMB.

It then became a matter of reverse engineering, as my uncle would have called it. This is also where fezzik's analysis is flawless for the rest of it. Find a way to block the escape first and THEN use that pesky h-pawn to finish it.

Well done by all, I thank you.
fezzik
14-May-12, 11:43

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Blackmonkey...
I did look at 1.h4+ first and saw it didn't work. I then glanced around for other ways to sac material then settled down and worked things out just as you did. 1.h4+ does NOT work. It certainly helped me to find the right move though.

If I had stayed on 1.h4+ as you did, I may have solved *this* puzzle slightly more quickly. But that technique doesn't work all the time, especially when there is a choice of checks and forcing moves.

Reverse engineering is indeed a good and valuable tool. In this case *I* didn't use that technique to solve the puzzle, but that is one of my tertiary tools.

But thank you for the compliments.
macheide
14-May-12, 12:37

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I just look at the position, and that was all.
blackmonkey
14-May-12, 13:12

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haha
macheide! you genius! what inspiration!
macheide
14-May-12, 13:26

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Well, it's just the truth,   Cheers.
blackmonkey
14-May-12, 13:44

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sped up, it's all a blur....
macheide, just because you don't feel the logic and thought coursing through your brain at 1000 times the speed of light, doesn't mean it isn't   I hope that some day my processes are automated just as well as yours.
hcajg77
14-May-12, 15:26

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I don't care how i solve a puzzle. I just solve it.
hcajg77
14-May-12, 15:27

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I just solved this one rather quickly.
blackmonkey
14-May-12, 16:21

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hjacg77, thank you for your input. i found it quite valuable! if you have more to say, please do.
hcajg77
16-May-12, 15:16

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blackmonkey
Thank you for the compliment, but I don't have much else to say about this topic.
hcajg77
16-May-12, 15:17

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Sorry, but I don't know what else to say
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