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9/15/2011 - Mate in 9


  • 3 years ago · Quote · #1

    dailypuzzle

  • 3 years ago · Quote · #2

    Ashchaos

    freshbacon & lycanwerewolf PROO

  • 3 years ago · Quote · #3

    frrixz

    I was surprised I got the first 3 moves correct.

  • 3 years ago · Quote · #4

    rarchinio

    Too easy for Thursday

  • 3 years ago · Quote · #5

    Roger_Pedersen

    lett!!

  • 3 years ago · Quote · #6

    KpsS

    easy

  • 3 years ago · Quote · #7

    square_zero

    Clever puzzle.

  • 3 years ago · Quote · #8

    marwanradman123

    Great,if 1...cxb5 then 2.Be5+ Kc6 3.Bd7+ Kc4 4.Bd6#

  • 3 years ago · Quote · #9

    IncrediBill

    You have to start off with your Knight in order to free a path up for your Bishop.  If you start off with your Rook, then you pretty much come to a dead end.  Black has an option to capture your Knight with his pawn, but that willl only lead to a Mate in 3.  After that, all of the moves are forced and Black's fate is sealed.

    .

    The following is a copy of Post #155 on Page 8 by @elindauer:

    I take decisions in these puzzles exactly the way I play OTB.  My goal is to find the best move with the least amount of calculation.  In this case, I solved the puzzle in 3 steps:

     

    phase 1: calculating forcing lines

    - check material, see that white is winning.

    - start calculating forcing lines.  My first glance was Rd7+ Kb8 Rxg7.  I evaluate this as winning for white but not resignable yet.  This becomes my main line.

    - consider other forcing checks / captures.  I happened to look at Nb5+ next.  First I tried Nb5+ cxb5 Rd7+.  The king has a couple choices, I tried Kb8 Be5+ Ka8 and ran into a wall.  I evaluate this as worse then my main line and discard it.  I note that letting the king get to a8 kills my attack, and try Nb5+ cxb5 Be5+ Kc6.  I look for forcing continuations, and see Rc3+, Bd7+ ... oh, Bd7+ Kc5 Bd6#... is mate!  ok.  So Nb5 cxb5 wins for white.

     

    Now I looked at Nb5+ Kb8 Bd4+ Ka8 Nc7+ Kg8.  I can see that Ne6+ here wins the exchange, and I already evaluate this as better than my main line.  So I cut off my calculation and call this my main line.

     

    Return to calculating forcing lines in the original position... Nd5+ cxd5 ... wait, no, Nd5+ Kb8 transposes to the main line and this is black's option.  No need to calculate Nd5+ cxd5 since black will only play this if it worse for me then my main line.  Ignore.

     

    So I am ready to move.  I go to the puzzle and play Nb5+ Kb8 Be5+ Ka8 Nc7+.

     

    Phase 2: where to put the knight.

    - from phase 1 I already have a main line: Ne6+ Ka8 Nxc8.  I extend a little farther and see Rxc8 Bxg7 picking up another pawn too.  I evaluate this as totally winning for white.  In time trouble I would play this instantly.  With a few minutes to spare, I calculate the alternatives:

    - Na6+ Ka8 and I see nothing better then just Nc7+ repeating moves.  Discard.

    - Ne8+... aha this allows Rd8... Ka8 Rd8+ Bc8 Rxc8+ Kb7.  I can't stop calculating just yet since the knight is pinned.  However I see that Rc7+ followed by Ne6 will save the knight.  Since I prefer to win the bishop then to win the exchange, and I can see that there is still some life in this line left to calculate, I evaluate this as better then Ne6+ and continue...

    - Rd8+ Rxd8... Ne6+... nothing really coming to mind here.  I am ready to move.

    So I go to the puzzle and play Ne8+ Ka8 Rd8+ Bc8 Rxc8+ Kb7.

     

    Phase 3: calculating the win.

    Same song, different verse.  I know that I have Rc7+ and just save the knight, with a winning 3 minor pieces vs a rook endgame.  I calculate a few more forcing lines to see if there is a mate:

    - Nd6+ is nice, only 1 answer... Ka6... Bf1+ b5... Bxb5+ cxb5 Rc6+ Ka5... seems promising but I'm not quite seeing the knockout.  I put this under "consider again later" and return to other ideas

    - Rb8+ Ka6 Bc8+ Kb5 I have h5+, f5+... oh wait, I see that Rb8+ Ka6 Nc7+ only allows Ka5... now Bc3+... is mate!  ok I'm ready to play.

     

    Rb8+ Ka6 Nc7+ Ka5 Bc3 winner winner chicken dinner.

     

    So this mate in 9 can be taken over the board as three different 3 move combinations.  You don't have to see the whole thing up front to solve it.  Hope that helps.

  • 3 years ago · Quote · #10

    ThunDerZ

    Amazing.

  • 3 years ago · Quote · #11

    AasTmO

    A very clever puzzle, even though I need someone to fully analyze it to spot why cxb5 isnt good of an answer

  • 3 years ago · Quote · #12

    ajindal

    long drawn out.

  • 3 years ago · Quote · #13

    knight_lover

    nice one especially the first move of knight

  • 3 years ago · Quote · #14

    ovymara

    good one

  • 3 years ago · Quote · #15

    bonbon44

    long but nice puzzle

  • 3 years ago · Quote · #16

    keebmanjr

    good one!

  • 3 years ago · Quote · #17

    ben32145

    I became unstuck with this puzzle as there is no Queen to sacrifice.

  • 3 years ago · Quote · #18

    melvis0

    Nice one.

  • 3 years ago · Quote · #19

    ypperlig89

    AWESOME

  • 3 years ago · Quote · #20

    Mrzinzin

    I like when the king is under pressure.

    GO PIRATES! 


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