Author: John Merlino
Date: 10:27:07 03/05/05
Go up one level in this thread
On March 05, 2005 at 12:19:53, Rob Basham wrote:
>[D]r1bqr3/pp1k2pp/3b1n2/4R1Bn/2Q1P3/P1N5/1PP2PPP/1B1R2K1 w - - 0 1
>
>Fritz 8 takes about 58 seconds to find..
>Rxd6+...!
>
>This move mates in about 23 moves..not sure...:-)
>
>If any program announces mate at move one, that would be exciting too...
>
>rob
CMX Yoda v25 finds Rxd6+ in two seconds on a P4-2.4, but there is no mate
announcement after more than 10 minutes.
After forcing:
1.Rxd6+ Kxd6 2.Qc5+ Kd7 3.Rd5+ Ke6 {Nxd5 leads to a mate in no more than twelve
moves} 4.Rxd8 Ke7 {the only move that does not lead to a quick mate}
...things get a bit fuzzy. There are four potential best moves here: Rxc8, Bxf6,
Ba2+ and Rxe8 -- all of which lead to very high scores.
[D]r1bRr3/pp3kpp/5n2/2Q3Bn/4P3/P1N5/1PP2PPP/1B4K1 w - - 0 5
So, it took a little while, almost 20 minutes, but we (Yoda and I :-) finally
got this:
Time Depth Score Positions Moves
0:00 1/5 14.57 25939 5.Ba2+ Be6 6.Bxf6 Raxd8 7.Bxd8
Bxa2 8.Qxh5+ Kf8
0:00 1/6 14.67 96330 5.Ba2+ Be6 6.Bxf6 Raxd8 7.Bxd8
Bxa2 8.Qxh5+ Kf8 9.Bc7
0:01 1/7 14.91 280990 5.Ba2+ Be6 6.Bxf6 Raxd8 7.Bxe6+
Rxe6 8.Bxd8 Nf4 9.Qxa7
0:03 1/8 14.87 845889 5.Ba2+ Be6 6.Bxf6 Raxd8 7.Bxe6+
Kxe6 8.Qf5+ Kf7 9.Bxd8+ Kg8 10.Bg5
g6
0:05 1/8 15.05 1182525 5.Bxf6 Nxf6 6.Ba2+ Kg6 7.Rxe8 Nxe8
8.Qe7 Nf6 9.Bf7+ Kh6 10.Qe5 Bf5
11.Qxf5
0:07 1/9 16.46 1865439 5.Bxf6 Nxf6 6.Ba2+ Kg6 7.Rxe8 Nxe8
8.h4 h6 9.h5+ Kh7 10.Qf8 Nf6 11.Bf7
Bf5 12.Qxa8
0:16 1/9 17.16 4054262 5.Rxc8 Kg8 6.Rxa8 Rxa8 7.e5 Re8
8.Bd2 b6 9.Qd4 Re6 10.exf6 Nxf6
0:19 1/10 17.58 4988993 5.Rxc8 Kg8 6.Rxa8 Rxa8 7.e5 Re8
8.Be3 a6 9.g4 Kh8 10.gxh5
0:43 1/11 18.55 11578240 5.Rxc8 Kg8 6.Rxa8 Rxa8 7.e5 Re8
8.Ba2+ Kh8 9.Bf7 Ra8 10.Qd6 h6
11.exf6 hxg5 12.Bxh5
1:41 2/12 18.86 28921154 5.Rxc8 Kg8 6.Rxa8 Rxa8 7.e5 Kh8
8.exf6 gxf6 9.Bxf6+ Nxf6 10.Qe5
Rf8 11.Qe7 Nd7 12.Qxd7 b6 13.Qxa7
5:25 2/12 26.08 96936342 5.Rxe8 Kxe8 6.Ba2 Nf4 7.Bxf4 Be6
8.Bxe6 Rd8 9.Qc7 Rd7 10.Bxd7+ Nxd7
11.Bd6 g5 12.Qc8+ Kf7 13.Qxd7+
Kg6 14.Qxb7
19:48 2/13 Mate12 381094649 5.Rxe8 Kxe8 6.Ba2 Bg4 7.Nd5 Nxd5
8.Qxd5 Nf6 9.Qf7+ Kd8 10.Qxg7 Kc8
11.Qxf6 Kd7 12.Qe7+ Kc6 13.Bd5+
Kb6 14.Qxb7+ Ka5 15.Qb4+ Ka6 16.Bc4#
So, I have determined that Rxd6 leads to a mate in no more than 16 moves.
jm
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