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  1. 19 Jul '06 21:18 / 2 edits
    Man this one had me (and Rybka) thinking for ages, and neither of us could get it!


    White to move and win

    This is one of the most difficult I have ever seen.
  2. 19 Jul '06 22:12
    Originally posted by Sicilian Smaug
    Nope, just put into Fritz, found in seconds
    Do you own a special version of fritz?Because mine has been "thinking" for over 30 minutes and still comes up with nothing
  3. 19 Jul '06 22:16
    Originally posted by Sicilian Smaug
    gh, Qe6+
    kg5 and black has no more threats? Maybe?
    No way off!
  4. 19 Jul '06 22:17
    Originally posted by Sicilian Smaug
    Nope, just put into Fritz, found in seconds
    I doubt that Rybka couldnt find it.

    Hint the "special move" is 2 moves deep.
  5. 19 Jul '06 22:18 / 4 edits
    Qc8, maybe? Threatens Be7+, prying K off Q, and followed by QxQ.
    Qc8 also prevents checks by the black Q.


    And if, after Qc8, Qe6+; QxQ, fxQ; gxh followed by h8=Q.


    Hmmm. If, after Qc8, Kg8!?; QxN and I think white wins, but not
    quickly, as black then has checks.
  6. 19 Jul '06 22:36
    how about 1.Qc5+ Kg8 2.gh+! Kh8!! (otherwise Qh5-g5-g7# ) 3.Be7!

    A. 3...Nb6! 4.Qxb6 Qa8 5.Qb3 Qc6+ 6.Kxf7 black has no checks so mate is inevitable
    B. 3...Nc7 4.Qxc7 Qa8 i'm having trouble with this line
    C. 3...Qa5 4.Qc8+ Kxh7 5.Qh3+ Kg8 6.Qg3+ any 7.Qg7#
    D. 3...a5 4.Qg5 Qc6+ 5.Kxf7 Qc4+ 6.Kf8 Qc8+ 7.Bd8 black has no more checks

    i'm pretty sure i'm right but line B has me worried.
  7. 19 Jul '06 22:52 / 1 edit
    Originally posted by aginis
    B. 3...Nc7 4.Qxc7 Qa8 i'm having trouble with this line
    i'm pretty sure i'm right but line B has me worried.
    dunno
    3...Qb8 looks more awkward
    gets the Q active without giving away the N
  8. 19 Jul '06 23:48
    Originally posted by CrawlIce
    Qc8, maybe? Threatens Be7+, prying K off Q, and followed by QxQ.
    Qc8 also prevents checks by the black Q.


    And if, after Qc8, Qe6+; QxQ, fxQ; gxh followed by h8=Q.


    Hmmm. If, after Qc8, Kg8!?; QxN and I think white wins, but not
    quickly, as black then has checks.
    Wrong
  9. 19 Jul '06 23:48
    Originally posted by aginis
    how about 1.Qc5+ Kg8 2.gh+! Kh8!! (otherwise Qh5-g5-g7# ) 3.Be7!

    A. 3...Nb6! 4.Qxb6 Qa8 5.Qb3 Qc6+ 6.Kxf7 black has no checks so mate is inevitable
    B. 3...Nc7 4.Qxc7 Qa8 i'm having trouble with this line
    C. 3...Qa5 4.Qc8+ Kxh7 5.Qh3+ Kg8 6.Qg3+ any 7.Qg7#
    D. 3...a5 4.Qg5 Qc6+ 5.Kxf7 Qc4+ 6.Kf8 Qc8+ 7.Bd8 black has no more checks

    i'm pretty sure i'm right but line B has me worried.
    Also wrong
  10. 19 Jul '06 23:48 / 3 edits
    Originally posted by aging blitzer
    dunno
    3...Qb8 looks more awkward
    gets the Q active without giving away the N
  11. 19 Jul '06 23:52 / 1 edit
    Not so easy is it?

    Alright i'll give you a hint: the first move is Qc8, and white's next move leads to a mate in eleven. For some reason a computer wont pick it up, but once given the key move you can watch the evaluation drop from +10 to -M11

    On the off chance someone does get the answer, please don't post it till everyone has guessed.
  12. 19 Jul '06 23:57
    Originally posted by LanndonKane
    Not so easy is it?

    Alright i'll give you a hint: the first move is Qc8, and white's next move leads to a mate in eleven. For some reason a computer wont pick it up, but once given the key move you can watch the evaluation drop from +10 to -M11

    On the off chance someone does get the answer, please don't post it till everyone has guessed.
    Okay, if you're giving us white's Qc8, what is black's response? I ask because I came up with Qc8, and I want to see what black's wiggle move is.

    ;-)
  13. 20 Jul '06 00:08 / 1 edit
    Originally posted by CrawlIce
    Okay, if you're giving us white's Qc8, what is black's response? I ask because I came up with Qc8, and I want to see what black's wiggle move is.

    ;-)
    Im not telling you black's response just yet, but I'll give you another hint... all the people and engines i've had this analyzed with say blacks best response to Qc8 is Kg8... but that's before they relize they're walking into a trap! I'm not sure if there is a better response than ...Kg8 with the knowledge that there is a mate in twelve, I haven't had the time to analyze it thouroughly.

    Edit: remember it's white plays and wins, not black.
  14. 20 Jul '06 01:21 / 1 edit
    Originally posted by LanndonKane
    Im not telling you black's response just yet, but I'll give you another hint... all the people and engines i've had this analyzed with say blacks best response to Qc8 is Kg8... but that's before they relize they're walking into a trap! I'm not sure if there is a better response than ...Kg8 with the knowledge that there is a mate in twelve, I haven't had ...[text shortened]... time to analyze it thouroughly.

    Edit: remember it's white plays and wins, not black.
    Well,1...,Kg8 is the only response to 1.Qc8.All other moves pretty much lose on the spot.
  15. 20 Jul '06 01:37
    Originally posted by LanndonKane
    Man this one had me (and Rybka) thinking for ages, and neither of us could get it![fen]n2Bqk2/5p1p/5KP1/p7/8/8/2Q5/8 w - - 0 1[/fen]

    White to move and win

    This is one of the most difficult I have ever seen.
    This stinks of underpromotion.