1. Montreal
    Joined
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    14 Mar '07 00:293 edits
    Originally posted by thelatermonths
    ..... Bf2+
    Kf8 Rd1+
    Rxd1 e2+
    Kxf2 exd1+ Knight
    That's part of it (although your move 2 should have read: Kf1 Rd1+).

    But on white's response on move 3 could be:

    3. Ke2 Rd2+
    4. Kf1 e2+
    Kxf2 e1=Q#

    But this other line:

    4. Qxd2 exd2+
    Kxd2 Bc8

    Just seems like a RBB vs RN (or BR vs R) endgame. Messy.

    4. Qxd2 exd2+
    Kxf2 Be4
    Ke3 Bxf5+
    Kxd2 Rd8+
    Kc3 Rc8+
    Kany Bxc2

    Is a little neater with a RB vs R.

    Maybe I missed something...

    Ah, forget it ilywrin already solved it with a reversal of moves which completely eliminates the white King's choices (here it is for clarity's sake):

    1. .. Rd1+
    Rxd1 Bf2+
    Rf1 e2+
    Kxf2 exd1=N+
    Kany Nxc3
  2. Standard membercludi
    Blogger
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    14 Mar '07 18:35
    ilywrin got it right:

    1...Rd1+ 2.Rxd1 Bf2+ 3.Kf1 e2+ Kxf2 exd1N+ and an easy black win

    In the actual game, Roth-Baumgarten 1959, the play went

    1...Bf2+ 2.Kf1 Rd1+ 3.Ke2 Rd2+ 4.Qxd2+ exd2+ 5.Kxf2 Bf3 6.Nd6 Rf8 and white resigned
  3. Standard membercludi
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    14 Mar '07 18:41


    Black has a clearly won position already, but how do you finish off white most effectively?

    Black to move.
  4. Standard memberGalaxyShield
    Mr. Shield
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    14 Mar '07 19:081 edit
    Originally posted by cludi
    [fen]r5k1/pbpp2pp/1p2p3/7q/2P1B3/P4r2/1P2nPPP/RQ3R1K b - -[/fen]

    Black has a clearly won position already, but how do you finish off white most effectively?

    Black to move.
    1. Rxf2?

    If 1. Rxf2 2. Ng3+ Kg1 3. Nxe4 and black is up 3 pawns and dominant position.

    If 1. Bxb7 2.Rxf1+ Qxf1 3. Ng3+ Kg1 4. Nxf1 Bxa8 and black is up a queen to a rook.
  5. Donationrichjohnson
    TANSTAAFL
    Walking on sunshine
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    14 Mar '07 21:58
    Originally posted by cludi
    [fen]r5k1/pbpp2pp/1p2p3/7q/2P1B3/P4r2/1P2nPPP/RQ3R1K b - -[/fen]

    Black has a clearly won position already, but how do you finish off white most effectively?

    Black to move.
    1. ... Bxe4
    2. Qxe4 Ng3+
  6. Montreal
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    15 Mar '07 01:151 edit
    Originally posted by richjohnson
    1. ... Bxe4
    2. Qxe4 Ng3+
    That would lead to fxg3, Rxf1+ Rxf1.

    So both sides lose a B and R and white loses an additional N.
  7. Montreal
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    15 Mar '07 01:19
    I'm thinking:

    Ng3+ fxg3
    Rxf1+ Qxf1
    Bxe4

    Both sides lose a R and a minor piece and we ruin black's King-side pawn structure.
  8. Joined
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    15 Mar '07 10:53
    Originally posted by cludi
    [fen]r5k1/pbpp2pp/1p2p3/7q/2P1B3/P4r2/1P2nPPP/RQ3R1K b - -[/fen]

    Black has a clearly won position already, but how do you finish off white most effectively?

    Black to move.
    How about...

    1...Bxe4
    2. Qxe4 Rxf2
    3. Rxf2 Ng3+ winning queen and bishop for rook and bishop.

    Or if 3. Qd3 (for example), then ...Rxf1 4. Rxf1 Ng3+ winning two rooks and a bishop for bishop and knight.
  9. Joined
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    15 Mar '07 11:47
    I wouldn't call this a 'simple tactical exercise'. Nice one though
  10. Standard memberGalaxyShield
    Mr. Shield
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    15 Mar '07 15:38
    Originally posted by untergang
    How about...

    1...Bxe4
    2. Qxe4 Rxf2
    3. Rxf2 Ng3+ winning queen and bishop for rook and bishop.

    Or if 3. Qd3 (for example), then ...Rxf1 4. Rxf1 Ng3+ winning two rooks and a bishop for bishop and knight.
    After the first Rxf2 white can play Qxa8+ winning both rooks after Kf7 Rxf7+.
  11. Standard memberGalaxyShield
    Mr. Shield
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    15 Mar '07 15:421 edit
    Originally posted by cludi
    [fen]r5k1/pbpp2pp/1p2p3/7q/2P1B3/P4r2/1P2nPPP/RQ3R1K b - -[/fen]

    Black has a clearly won position already, but how do you finish off white most effectively?

    Black to move.
    Oh wow, I was way off. I just finally saw it.

    1. Rh3! gxh3
    2. Qf3+ Bxf3
    3. Bxf3#


    Wow, cool. 🙂
  12. Joined
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    15537
    15 Mar '07 19:48
    Originally posted by GalaxyShield
    After the first Rxf2 white can play Qxa8+ winning both rooks after Kf7 Rxf7+.
    D'oh, completely missed that.
  13. Standard membercludi
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    16 Mar '07 05:28
    Originally posted by GalaxyShield
    Oh wow, I was way off. I just finally saw it.

    1. Rh3! gxh3
    2. Qf3+ Bxf3
    3. Bxf3#


    Wow, cool. 🙂
    Very well spotted, Josh.

    I know this one was tough, but I thought it was a very
    beautiful and somewhat unusual checkmate.
  14. Standard membercludi
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    16 Mar '07 05:31


    White to move
  15. Montreal
    Joined
    27 Jan '07
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    2141
    16 Mar '07 05:402 edits
    Originally posted by cludi
    [fen]3rkb1r/pp3p1p/1q4p1/4nN2/4N3/8/PP2QPPP/R4RK1 w - -[/fen]

    White to move
    1. Qb5+ Qxb5
    2. Nf6#

    1. .. Nd7
    2. Qxb6 axb6 (.. Nxb6, Nf6# ) (edit: dumb googly face)
    3. Re1

    1. .. Rd7
    2. Qxb6 axb6
    3. Nf6+ Kd8
    4. Nxd7 Kxd7

    Which wins the exchange in addition to doubling black's queenside pawns.
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