Author: Roy Eassa
Date: 11:34:19 04/18/02
Go up one level in this thread
On April 18, 2002 at 13:45:51, Mike S. wrote:
>On April 18, 2002 at 13:14:06, John Merlino wrote:
>
>>>>>>[D]3Q4/3p4/P2p4/N2b4/8/4P3/5p1p/5Kbk w - - bm Qa8; id Quick-03;
>
>>(...)
>>Amusing little problem -- a queen sacrifice, you can promote to a Bishop, you
>>can capture en passant for checkmate -- fun stuff.
>
>Here's another study from my Quicktest, by Von Witonsti (1913). It doesn't have
>so much "features" like the other one though, which was by Balasz (1934).
>
>[D]1n1r1rk1/ppq2ppp/3p2b1/3B1NP1/4PB1R/bP2P2P/P1P5/3KQ1R1 w - - bm Qc3; id
>Quick-01;
>
>I've tested The King 3.12d Selektive Search=10 (32 MB hash), and it's quite fast
>here compared to some othere engines (as usual in mate combinations). Fastest in
>my tests was Little Goliath 3.5c UCI, in this position.
>
>I think the solution is especially difficult because of a "silent" 5th move in
>between, and in the 6th move white must sac another piece, but it's not a
>checking move. It's the most difficult in that test suite.
>
Black can avoid mate for a long time, I think, plus White can probably win with
another first move (e.g., Qd2 followed by Qd4). I tried removing the pawns on
a2 and b3, which means that White may not be able to win any other way but the
combination still works completely.
[d]1n1r1rk1/ppq2ppp/3p2b1/3B1NP1/4PB1R/b3P2P/2P5/3KQ1R1 w - - 0 1
1.Qc3!! Qxc3 2.Ne7+ Kh8 3.Nxg6+ fxg6
[3...Kg8 4.Ne7+ Kh8 5.g6 h6 6.Bxh6 Qa1+ 7.Ke2 {and mates}]
4.Rxh7+! Kxh7 5.Rg4 Rxf4 6.Rxf4 Qa1+ 7.Ke2 Qf1+ {to avoid quick mate}
8.Kxf1 Rf8 9.Rxf8 Nd7 10.Rf7 {wins the knight} +-
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