1. Joined
    31 May '07
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    696
    15 May '08 17:54
  2. Standard memberSwissGambit
    Caninus Interruptus
    2014.05.01
    Joined
    11 Apr '07
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    92274
    15 May '08 18:15
    Originally posted by doodinthemood
    [fen]8/8/8/8/3BN1R1/Q2p1k1P/1p3p2/5K2 w[/fen]
    1.Qb3!
    1...a1R/Q 2.Qd1+ R/Qxd1#
    1...a1B 2.Qxd3+ Bxd3
    1...a1N 2.Nd2+ Nxd2#


    Yours?
  3. Joined
    25 Apr '06
    Moves
    5939
    15 May '08 18:32
    Originally posted by SwissGambit
    1.Qb3!
    1...a1R/Q 2.Qd1+ R/Qxd1#
    1...a1B 2.Qxd3+ Bxd3
    1...a1N 2.Nd2+ Nxd2#


    Yours?
    Notation error (the pawn is on b2, not a2). I thought selfmates (just like helpmates) were always Black to move first, but I have never actually tried any, so I guess I was wrong in the assumption.
  4. Joined
    31 May '07
    Moves
    696
    15 May '08 18:51
    Originally posted by SwissGambit
    1.Qb3!
    1...a1R/Q 2.Qd1+ R/Qxd1#
    1...a1B 2.Qxd3+ Bxd3
    1...a1N 2.Nd2+ Nxd2#


    Yours?
    Well done 🙂
    And yes it's mine. Any suggestions for improvement? I could have spent more time over it, and with most puzzles I stick a few more moves in it so the key is more hidden, but I thought it wouldn't be worth it here.
  5. Joined
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    5939
    15 May '08 19:15
    Originally posted by doodinthemood
    Well done 🙂
    And yes it's mine. Any suggestions for improvement? I could have spent more time over it, and with most puzzles I stick a few more moves in it so the key is more hidden, but I thought it wouldn't be worth it here.
    I have no credentials at all, but I like it as it is now.
  6. Standard memberSwissGambit
    Caninus Interruptus
    2014.05.01
    Joined
    11 Apr '07
    Moves
    92274
    15 May '08 19:36
    Originally posted by doodinthemood
    Well done 🙂
    And yes it's mine. Any suggestions for improvement? I could have spent more time over it, and with most puzzles I stick a few more moves in it so the key is more hidden, but I thought it wouldn't be worth it here.
    It would be neat if there was a different mate for the Q promotion than R, but I don't see how you could motivate it.
  7. Joined
    25 Aug '06
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    0
    15 May '08 22:171 edit
    Originally posted by SwissGambit
    It would be neat if there was a different mate for the Q promotion than R, but I don't see how you could motivate it.
    Which reminds me of the following problem:

    Selfmate in 3
  8. Standard memberSwissGambit
    Caninus Interruptus
    2014.05.01
    Joined
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    92274
    15 May '08 23:131 edit
    Originally posted by David113
    Which reminds me of the following problem:
    [fen]7N/Ppp2P2/Rrk4P/K1P5/1P2P2P/2P4Q/5p1R/5NB1 w[/fen]
    Selfmate in 3
    Haha, I thought of that one too. Nothing encourages a new composer like showing their same theme done much better. 😛
  9. Joined
    25 Apr '06
    Moves
    5939
    16 May '08 07:232 edits
    1. a8=B!
    1. ... Rxa6#
    1. ... fxg1=Q
    2. f8=Q!
    [quote]2. ... Rxa6#
    2. ... Qxh2 3. Nxh2 Rxa6#
    2. ... Qh1 3. Rxh1 Rxa6#
    2. ... Qxf1 3. b5+ Qxb5#
    2. ... Qg2 3. Rxg2 Rxa6#
    2. ... Qg3 3. Nxg3 Rxa6#
    2. ... Qg4 3. Qxg4 Rxa6#
    2. ... Qg5 3. hxg5 Rxa6#
    2. ... Qg6 3. Nxg6 Rxa6#
    2. ... Qg7 3. hxg7/Qxg7 [COOK'D] Rxa6#
    2. ... Qg8 3. Qxg8 Rxa6#
    2. ... Qf2 3. Rxf2 Rxa6#
    2. ... Qe3 3. Nxe3 Rxa6#
    2. ... Qd4 3. cxd4 Rxa6#
    2. ... Qxc5+ 3. b5+ Qxb5#

    1. ... fxg1=R
    2. f8=R
    2. ... Rxa6#
    2. ... Rh1 3. Rxh1 Rxa6#
    2. ... Rxf1 3. Rxf1 Rxa6#
    2. ... Rg2 3. Rxg2 Rxa6#
    2. ... Rg3 3. Nxg3 Rxa6#
    2. ... Rg4 3. Qxg4 Rxa6#
    2. ... Rg5 3. hxg5 Rxa6#
    2. ... Rg6 3. Nxg6 Rxa6#
    2. ... Rg7 3. hxg7 Rxa6#
    2. ... Rg8 3. Rxg8 Rxa6#

    1. ... fxg1=B
    2. f8=B!
    2. ... Rxa6#
    2. ... Bxh2 3. Nxh2 Rxa6#
    2. ... Bf2 3. Rxf2 Rxa6#
    2. ... Be3 3. Nxe3 Rxa6#
    2. ... Bd4 3. cxd4 Rxa6#
    2. ... Bxc5 3. Bxc5 Rxa6#

    1. ... fxg1=N
    2. f8=N!
    2. ... Rxa6#
    2. ... Ne2 3. Rxe2 Rxa6#
    2. ... Nf3 3. Qxf3 Rxa6#
    2. ... Nxh3 3. Rxh3 Rxa6#

    [/quote]
  10. Joined
    25 Apr '06
    Moves
    5939
    16 May '08 07:243 edits
    Edit: no edit to edit out the messy display. OK one edit for a wrong move. Second edit for another flaw. I missed that Qxf1 covers a6 (shame on me)
  11. Joined
    31 May '07
    Moves
    696
    16 May '08 07:32
    I can understand why knight needs to be met with knight in that one, but why can the other three not be met by queen?
  12. Joined
    25 Apr '06
    Moves
    5939
    16 May '08 07:341 edit
    Originally posted by doodinthemood
    I can understand why knight needs to be met with knight in that one, but why can the other three not be met by queen?
    1. ... fxg1=R 2. f8=Q? (I thought that was possible too) but: 2. ... Rxf1! 3. Qfxf1 and now 3. ... Rxa6+ is no mate because a6 is covered by the wQf1.

    1. ... fxg1=B 2. f8=Q Bxc5 and now 3. bxc5 Rxa6+ is no mate.

    1. ... fxg1=Q 2. f8=Q is correct.
  13. Standard memberSwissGambit
    Caninus Interruptus
    2014.05.01
    Joined
    11 Apr '07
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    92274
    16 May '08 07:581 edit
    Originally posted by heinzkat
    [b]1. a8=B!
    1. ... Rxa6#
    1. ... fxg1=Q
    2. f8=Q!
    [quote]2. ... Rxa6#
    2. ... Qxh2 3. Nxh2 Rxa6#
    2. ... Qh1 3. Rxh1 Rxa6#
    2. ... Qxf1 3. b5+ Qxb5#
    2. ... Qg2 3. Rxg2 Rxa6#
    2. ... Qg3 3. Nxg3 Rxa6#
    2. ... Qg4 3. Qxg4 Rxa6#
    2. ... Qg5 3. hxg5 Rxa6#
    2. ... Qg6 3. Nxg6 Rxa6#
    2. ... Qg7 3. hxg7/Qxg7 [COOK'D] Rxa6#
    2. ... Qg8 3. Qxg8 ...[text shortened]... ... Ne2 3. Rxe2 Rxa6#
    2. ... Nf3 3. Qxf3 Rxa6#
    2. ... Nxh3 3. Rxh3 Rxa6#

    [/quote][/b]
    If there are two different 2nd moves [or later] that work for White, those are called 'duals', not cooks.

    In a task of this magnitude, a minor dual or two is forgivable [say, two third moves that work].
  14. Standard memberSwissGambit
    Caninus Interruptus
    2014.05.01
    Joined
    11 Apr '07
    Moves
    92274
    16 May '08 08:051 edit
    Originally posted by doodinthemood
    I can understand why knight needs to be met with knight in that one, but why can the other three not be met by queen?
    1...fg1R 2.f8Q? Rxf1! 3.Qxf1 Rxa6+ is not mate because the Q guards a6.
    1...fg1B 2.f8Q? Bxc5! 3.bxc5 opens up b4 so 3...Rxa6+ is again not mate.

    And the Queen is of course met by Queen.

    Edit: beaten to the punch.
  15. Joined
    25 Apr '06
    Moves
    5939
    16 May '08 08:071 edit
    Originally posted by SwissGambit
    If there are two different 2nd moves [or later] that work for White, those are called 'duals', not cooks.

    In a task of this magnitude, a minor dual or two is forgivable [say, two third moves that work].
    I knew it it, sorry, but I was confused by the 'cook' I had found after 1. ... fxg1=R with 2. f8=Q? (indeed I found out that 2. ... Rxf1 3. Qfxf1 Rxa6 is no mate, after having posted it already, shame on me). I was a bit too enthusiastic in calling all extra solutions 'cooks'.
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