Mate in 15....! (also a note to Steve B.)

[rightrook]

[d]2b3k1/2q1rpp1/pp5p/3pP2Q/2pP3N/2P2RP1/PP4P1/2B2RK1 w - - 0 1

How long does it take your engine to see a "mate in 15"...?

It takes Hiarcs 11.2 about 3 minutes to ann. mate in 15..
but at first, it sees a mate in 17 in about 60 sec,...!

Hi Steve B.

Bxh6 is also a good test for dedicated machines.......

I made up this test position for dedicated machines.... years ago now..
RISC found Bxh6 in about 4 seconds..
Novag Scorpio....takes 1 min. 56 sec.

[rightrook]

Correction.......Now HIARCS 11.2 announces a mate in 21 ....in 2 min.

and then later a Mate in 13...in about 3 minutes..


so now I am not sure what it is...

[David Dahlem]

Spark says mate in 15 in 7 seconds, then switches to mate in 13.

FEN: 2b3k1/2q1rpp1/pp5p/3pP2Q/2pP3N/2P2RP1/PP4P1/2B2RK1 w - - 0 1

Spark 0.3a:

14/30 00:07 6.811.296 933.437 +M15 Bc1xh6 g7xh6 Qh5xh6 Re7e6 Qh6g5+ Kg8f8 Qg5h5 Kf8e8 Rf3xf7 Qc7xf7 Rf1xf7 Re6e7 Rf7h7+ Ke8d7 Qh5f5+ Kd7c6 Qf5xc8+ Kc6b5 Rh7xe7 a6a5 Qc8d7+ Kb5a6 Qd7b7+ Ka6b5 Qb7xd5+ Kb5a6 Qd5xc4+ b6b5 Qc4c6+
15/30 00:10 10.358.474 1.035.847 +M13 Bc1xh6 Kg8f8 Bh6g5 Kf8e8 Rf3xf7 Re7xf7 Qh5h8+ Ke8d7 Rf1xf7+ Kd7c6 Rf7xc7+ Kc6xc7 Bg5d8+ Kc7c6 Qh8e8+ Kc6b7 Qe8f7+ Kb7a8 Bd8xb6 Bc8d7 Qf7xd7 Ka8b8 Qd7a7+ Kb8c8 Qa7c7+
16/30 00:11 12.667.883 1.078.117 +M13 Bc1xh6 Kg8f8 Bh6g5 Kf8e8 Rf3xf7 Re7xf7 Qh5h8+ Ke8d7 Rf1xf7+ Kd7c6 Rf7xc7+ Kc6xc7 Bg5d8+ Kc7c6 Qh8e8+ Kc6b7 Qe8f7+ Kb7a8 Bd8xb6 Bc8d7 Qf7xd7 Ka8b8 Qd7a7+ Kb8c8 Qa7c7+
17/30 00:16 18.559.484 1.134.512 +M13 Bc1xh6 Kg8f8 Bh6g5 Kf8e8 Rf3xf7 Re7xf7 Qh5h8+ Ke8d7 Rf1xf7+ Kd7c6 Rf7xc7+ Kc6xc7 Bg5d8+ Kc7c6 Qh8e8+ Kc6b7 Qe8f7+ Kb7a8 Bd8xb6 Bc8d7 Qf7xd7 Ka8b8 Qd7a7+ Kb8c8 Qa7c7+

[rightrook]

Wow...thanks David....only 7 seconds to ann. a mate is pretty fast...!!

regards

Robert

[David Dahlem]

Wow...thanks David....only 7 seconds to ann. a mate is pretty fast...!!

regards

Robert

Spark is really awesome at finding mates.

[rightrook]

Is that your own engine? Is there a place where we can download that
Spark 0.3a....?

So far...I do not have that one on my computer...

regards

Robert

[Steve B]

Hi Rob

just received in a new/old chess computer
a Novag Constellation 2 Mhz
the first in the Constellation series
your position seems like as good a way as any to test the computer so will give it a whirl later today

Regards
Steve

[David Dahlem]

Is that your own engine? Is there a place where we can download that
Spark 0.3a....?

So far...I do not have that one on my computer...

regards

Robert

Not my engine. The homepage of Spark is here -

http://members.ziggo.nl/allard.siemelink/spark/

[David Dahlem]

It takes Spark longer to find this (unconfirmed) mate in 14.

[d]k2n1bK1/p2P1P1b/B7/5p2/8/8/8/8 w - - 0 1

Spark 0.3a:

24/42 14:47 1.189.651.700 1.340.383 +M14 Kg8xf8 Bh7g6 Kf8e7 Nd8xf7 Ba6c4 Ka8b7 Bc4xf7 Bg6xf7 Ke7xf7 f5f4 d7d8Q f4f3 Qd8f6 f3f2 Kf7e7 f2f1B Qf6xf1 Kb7b6 Ke7d6 Kb6b7 Qf1e2 a7a5 Qe2b5+ Kb7c8 Qb5b6 a5a4 Qb6c7+

[Jouni]

Actually it's mate in 12:

Analysis by spark-0.3a:

1.Bxh6 Kf8 2.Ng6+ Ke8 3.Bg5 Be6 4.Nxe7 Kd7 5.Rxf7 Qb8 6.Nxd5+ Kc6 7.a4 Bxf7 8.Qxf7 b5 9.Qe6+ Kb7 10.Rf7+ Qc7 11.Rxc7+ Ka8 12.Qc8#
+- (#12) Depth: 18/30 00:00:13 43480kN

Jouni