1. Joined
    25 Aug '06
    Moves
    0
    06 Mar '07 19:35


    White to move and win.
  2. Joined
    03 May '05
    Moves
    10684
    06 Mar '07 22:35
    i have 1.Bh4, but i'm struggling with ...g1(N)+
  3. Joined
    03 May '05
    Moves
    10684
    06 Mar '07 22:426 edits
    1. Bh4 g1 (Q,B,R)
    2. e3#

    1. ... h1 (Q,R)
    2.e4+ Kg1
    3.Kg3 ... (Q,R is going nowhere good, white wins)

    1. ... Kg1
    2. Kg3

    i suppose white's passed pawns mean underpromotions will lose for black so long as g3 is held by king. but then i'm too lazy today to think it through, and it's taken 5 edits already 😕😴

    edit6: 1... Kg1, 2. Kg3 h1(B) looks drawn. perhaps i'm on the wrong line altogether. g'night.
  4. Joined
    12 Mar '03
    Moves
    37177
    06 Mar '07 23:06
    Quite some bishop maneuvering required here, but all fitting in a single and simple plan. The black squared bishop goes to g3, the king helps closing a box for the promoted queen at g4, and the white squared bishop creates tempi. Black's moves are pretty forced in this sequence:
    1.e3 (not e4! see move 6) Kg1 2.Bh4 h1=Q 3.Bf2+ Kh2 4.Bg3+ Kg1 5.Kg4! closes the box for the black queen) Qh2 (what else?) 6.Be4! Qh1 7.Bd5 Kf1 8.Bc4+ Kg1 9.Be2! Qh2(again, what else?) 10.Bf3 Qh1 11.Be4 Kf1 12.Bd3+ Kg1 13.Bc4 Qh2 14.Bd5 Qh1 (otherwise white takes on h2 and g2 and wins with the pawn) 15.e4! (at last) Kf1 16.Bc4+ Kg1 17.e5 Qh2 18.Bd5 Qh1 19.e6 Qh2 20.Bxh2+ Kxh2 21.Bxg2 and the pawns do the job.
  5. Joined
    03 May '05
    Moves
    10684
    07 Mar '07 12:34
    ah yes, i see now.. i was starting with the wrong key. e3 creates tempo and spacial advantage. good endgame practice. 🙂
  6. Joined
    15 Feb '07
    Moves
    667
    07 Mar '07 16:45
    Originally posted by David113
    [fen]3B4/8/1p6/1P5P/8/3B1K2/4P1pp/5k2[/fen]

    White to move and win.
    1.e3/e4+ Kg1
    2.Bxb6+ Kh1

    But then after a forced 3..g1(?) 4.Bxg1 hxg1(Q) I'm in trouble.
  7. Montreal
    Joined
    27 Jan '07
    Moves
    2141
    12 Mar '07 01:42
    Originally posted by David113
    [fen]3B4/8/1p6/1P5P/8/3B1K2/4P1pp/5k2[/fen]

    White to move and win.
    How about this:

    1. e4+ Kg1
    2. Kg3! ..

    Now 2. ..h1=Q loses to 3. Bxb6#

    2. ..h1=N+ (underpromoting in the hopes of gaining enough time to promote again)
    3. Kf3 Kh2
    4. Bxb6 (securing the promotion square with the white K's help)

    Also:
    3. ..Nf2
    4. Bxb6 Kany
    5. Bxf2
  8. Montreal
    Joined
    27 Jan '07
    Moves
    2141
    12 Mar '07 02:371 edit
    Oops, forgot one line:

    1. e4+ Kg1
    2. Kg3! Kh1!

    Now I can't get the B to d4 in time... I'll look into this afterwards.
  9. Joined
    12 Mar '03
    Moves
    37177
    12 Mar '07 09:29
    It seems that posting the solution did not convince the other posters, but yet they all run into problems.
  10. Montreal
    Joined
    27 Jan '07
    Moves
    2141
    12 Mar '07 12:31
    Originally posted by Mephisto2
    It seems that posting the solution did not convince the other posters, but yet they all run into problems.
    Yes, it does work! Sorry about that, your post was the only one I skipped over since it was difficult to read (no paragraph breaks).
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