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Posers and Puzzles

Posers and Puzzles

  1. 25 Nov '06 16:33
    I only recently discovered this great site, so here's my first attempt at making an FEN... this is a position I encountered a couple days ago in a game ... black to move
  2. Subscriber BigDoggProblem
    The Advanced Mind
    25 Nov '06 19:30 / 1 edit
    Originally posted by Paeskovski
    I only recently discovered this great site, so here's my first attempt at making an FEN... this is a position I encountered a couple days ago in a game ... black to move [fen]1k6/pp5p/5pqb/8/5p1Q/2pPr1P1/2P4P/R2K3R b - - 0 1[/fen]
    It seems the Rook sacrifice 1...Rxd3+ wins. Variations:

    A) 2.cxd3 Qxd3+ 3.Ke1 Qd2+ 4.Kf1 f3 5.Qc4 Qg2+ 6.Ke1 Qxh1+ 7.Kf2 Qg2+ 8.Ke1 f2+
    ...A1) 5.Qh3 Qe2+ 6.Kg1 f2+ 7.Kg2 f1=R#
    ...A2) 5.Ra2 Qd3+ 6.Ke1 [6.Kg1 Be3+ 7.Rf2 Qd1#] 6...Bd2+ 7.Kd1 Qb1#

    B) 2.Ke2 Qe4+ 3.Kf2 Rd2+ 4.Kf1 Qg2+ 5.Ke1 Qf2#

    Edit: Just noticed C) 2.Kc1. Black already has a material edge, but the best line I've found is 2...Rd2 3.Ra2 fxg3. Can anyone find a 'cleaner' win?
  3. Standard member preachingforjesus
    Iron Pillar
    25 Nov '06 22:31 / 2 edits
    Originally posted by BigDoggProblem
    It seems the Rook sacrifice [b]1...Rxd3+ wins. Variations:

    A) 2.cxd3 Qxd3+ 3.Ke1 Qd2+ 4.Kf1 f3 5.Qc4 Qg2+ 6.Ke1 Qxh1+ 7.Kf2 Qg2+ 8.Ke1 f2+
    ...A1) 5.Qh3 Qe2+ 6.Kg1 f2+ 7.Kg2 f1=R#
    ...A2) 5.Ra2 Qd3+ 6.Ke1 [6.Kg1 Be3+ 7.Rf2 Qd1#] 6...Bd2+ 7.Kd1 Qb1#

    B) 2.Ke2 Qe4+ 3.Kf2 Rd2+ 4.Kf1 Qg2+ 5.Ke1 Qf2#

    Edit: Just noticed C) 2.Kc1. Black already h ...[text shortened]... al edge, but the best line I've found is 2...Rd2 3.Ra2 fxg3. Can anyone find a 'cleaner' win?[/b]
    1. ... Rxd3+ 2. Kc1 fxg3+ 3. Kb1

    this looks like a great start. I was looking at: 3. ... f5 but 4. Qa4 slows things down quite a bit

    edit: actually after moves like Rd2 and gxh2 things are still going pretty good.
  4. Subscriber BigDoggProblem
    The Advanced Mind
    26 Nov '06 01:03
    Originally posted by preachingforjesus
    1. ... Rxd3+ 2. Kc1 fxg3+ 3. Kb1

    this looks like a great start. I was looking at: 3. ... f5 but 4. Qa4 slows things down quite a bit

    edit: actually after moves like Rd2 and gxh2 things are still going pretty good.
    Yeah, the main idea of delaying ...fxg3 is not to let the wQ have access to the full 4th rank so soon.
  5. 26 Nov '06 10:42
    Originally posted by BigDoggProblem
    It seems the Rook sacrifice [b]1...Rxd3+ wins. Variations:

    A) 2.cxd3 Qxd3+ 3.Ke1 Qd2+ 4.Kf1 f3 5.Qc4 Qg2+ 6.Ke1 Qxh1+ 7.Kf2 Qg2+ 8.Ke1 f2+
    ...A1) 5.Qh3 Qe2+ 6.Kg1 f2+ 7.Kg2 f1=R#
    ...A2) 5.Ra2 Qd3+ 6.Ke1 [6.Kg1 Be3+ 7.Rf2 Qd1#] 6...Bd2+ 7.Kd1 Qb1#

    B) 2.Ke2 Qe4+ 3.Kf2 Rd2+ 4.Kf1 Qg2+ 5.Ke1 Qf2#

    Edit: Just noticed C) 2.Kc1. Black already h ...[text shortened]... al edge, but the best line I've found is 2...Rd2 3.Ra2 fxg3. Can anyone find a 'cleaner' win?[/b]
    I indeed played 1...Rxd3+

    After 2.cxd3, I played 2...Qxd3+ 3.Ke1 f3 resulting in a much faster mate than you proposed, because Qc4 is now impossible for white (4. Ra2? c2!)

    I figured the only way to prevent a mate for white is 2.Kc1 and the variation I had in mind was: 2...fxg3+ 3.Kb1 g2 4. Rg1 Rd2 5.Qa4 Be3 and a definite advantage for black...
    ...fortunately however my opponent took the bate, played 2.cxd3 and resigned after 3...f3
  6. 28 Nov '06 13:29
    1...RXd3+
    if 2. cd Qxd3+
    3. Ke1 f3 winning.

    if 2. Ke1 f3, still winning, even 2 .. Rd2