Author: Richard A. Fowell (fowell@netcom.com)
Date: 23:16:59 02/09/99
Go up one level in this thread
On February 08, 1999 at 19:36:27, Dann Corbit wrote:
A timely challenge, since I'm beta testing MacChess 5.01, which was
designed to provide more accurate mate scores. I gave MacChess 3 hours
per problem on my 7300/180 (though it took less than 20 minutes in all
but one problem to find the best result it could find in 3 hours).
Of the six problems, MacChess found forced mates in all of them:
1 - improved (mate in 11 vs. mate in 12),
4 - matched
2 - found longer mates
============
6 - total.
Richard A. Fowell (fowell@netcom.com)
>Or better yet, can you improve them?
On the one, yes.
>
>Epd ce pv
>
>pm
>------------------------------------------------ ------
>-------------------------------------------------------------------------------------------------------
> --------
>1R1Q4/5k2/p1p1pPb1/P4qp1/B3p3/4P3/5K1P/8 w - - 32748 Ke1 Bh7 Rb7+ Kg6 Qe8+
>Kh6 f7 Kh5 f8=Q+ Kg4 Qxf5+ Bxf5 Bd1+ Kh3 Rb2 Bg4 Qh8+ Bh5 Qxh5#
> Ke1
No improvement on this mate in 10. A hair under 20 minutes.
11/01|00:19:41| 206335319|+M10 | Ke1 Bh7 Rb7+ Kg6 Qe8+ Kh6 f7 Qxa5+ Ke2
Qb4 f8=Q+ Qxf8 Qxf8+ Kh5 Rxh7+ Kg4 h3+ Kg3 Qf2+
>
>8/3r4/3k1B2/5K2/8/5Q2/8/8 w - - 32754 Qf4+ Kc5 Ke6 Rc7 Qxc7+
>Kb4 Be7+ Kb3 Qc1 Ka4 Qc4+ Ka5 Bd8#
Didn't see this mate in 7 (or the keymove). Best found was mate in 10.
10/01|00:17:40| 189395733|+M10 | Qa3+ Kd5 Qa5+ Kc6 Qa4+ Kd6 Be5+ Ke7 Qc6
Rd3 Bf6+ Kf8 Qc8+ Rd8 Qxd8+ Kf7 Qe7+ Kg8 Qg7+
>
>6k1/8/8/5K2/3B4/8/6N1/8 w - - 32744 Ke6 Kf8 Nf4 Ke8 Bb6 Kf8
>Nh5 Ke8 Ng7+ Kf8 Kf6 Kg8 Be3 Kf8 Bc5+ Kg8 Kg6 Kh8 Nf5 Kg8 Nh6+ Kh8 Bd4#
>Ke6
MacChess makes this mate in 11, not 12. A hair under 15 minutes.
14/01|00:14:41| 191235139|+M11 | Ke6 Kf8 Ne3 Ke8 Bf6 Kf8 Nf5 Ke8 Bg5 Kf8
Be7+ Kg8 Kf6 Kh7 Kf7 Kh8 Kg6 Kg8 Nh6+ Kh8 Bf6+
>
>8/8/4K1k1/3N4/8/4B3/8/8 w - - 32744 Nf6 Kg7 Nh5+ Kg6 Ng3
>Kg7 Bd4+ Kg6 Bf6 Kh6 Kf7 Kh7 Nh5 Kh6 Nf4 Kh7 Bg5 Kh8 Ng6+ Kh7 Nf8+ Kh8 Bf6#
> Nf6
MacChess finds this mate in 12 in 83 seconds.
12/01|00:01:23| 17198346|+M12 | Nf6 Kg7 Nh5+ Kg6 Ng3 Kg7 Bd4+ Kg6 Bf6 Kh6
Kf7 Kh7 Ne2 Kh6 Nf4 Kh7 Bg5 Kh8 Ng6+ Kh7 Nf8+ Kh8 Bf6+
>
>2B5/6Bp/4P1p1/8/p4k2/1p6/3r3P/4R2K w - - 32754 e7 Re2 Rxe2 b2 Bxb2 Kg5
>e8=Q Kh4 Qxa4+ Kg5 Qg4+ Kh6 Qh4#
>e7
MacChess finds this mate in 7 in 105 seconds.
08/01|00:01:45| 19101228|+M7 | e7 Re2 Rxe2 b2 Bxb2 Kg5 e8=Q Kh6 Bc1+
g5 Re6+ Kg7 Bb2+
>
>2k5/8/1pBK4/1P6/8/8/8/8 w - - 32746 Be4 Kd8 Bg6 Kc8 Kc6 Kd8
>Kxb6 Kc8 Kc5 Kb8 b6 Kc8 Bf5+ Kb7 Be4+ Ka6 b7 Ka5 b8=Q Ka4 Qb4#
>Be4
MacChess misses this mate in 11 - mate in 13 is the best it found.
15/01|00:42:50| 482520207|+M13 | Bd7+ Kd8 Ke6 Kc7 Ke7 Kb8 Kd6 Kb7 Bf5 Ka8
Kc7 Ka7 Bd3 Ka8 Kxb6 Kb8 Bf5 Ka8 Kc7 Ka7 Bc8 Ka8 Bb7+ Ka7 b6+
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