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Simple mate in 6 that gives some engines trouble

Posted: Thu May 02, 2019 12:34 am
by Dann Corbit
acn 883293; acs 2; bm Nh6; ce 32756; dm 6; pv Nh6 gxh6 Re5 dxe5 Qf6+ exf6 Ne3 dxe3 Rf5 g1=Q Rh5#;

Re: Simple mate in 6 that gives some engines trouble

Posted: Thu May 02, 2019 3:09 am
by camava
Hi mr Dann Corbit.You are right,Komodo 12,..stockfis 10,..Houdini 5 pro,..booot 6.3..,Fizbo2.0,...Rybka4,..Andscacs,..all they are powerfull engines and they could not find mate in 5 minutes that i was test them.But Critter1.6a,..Cheese 20...Counter_v3.2...DeepSaros4.16...IvanHoe9.46f...MateFinder10...Octochessr5190 and Spark 1.0 found Mate#6 in less than 5 seconds!.
Now i think this is because they have this position in some datebase.I had having same situation with other positions,that is strange for me.

Re: Simple mate in 6 that gives some engines trouble

Posted: Thu May 02, 2019 4:03 am
by camava
camava wrote:
Thu May 02, 2019 3:09 am
Hi mr Dann Corbit.You are right,Komodo 12,..stockfis 10,..Houdini 5 pro,..booot 6.3..,Fizbo2.0,...Rybka4,..Andscacs,..all they are powerfull engines and they could not find mate in 5 minutes that i was test them.But Critter1.6a,..Cheese 20...Counter_v3.2...DeepSaros4.16...IvanHoe9.46f...MateFinder10...Octochessr5190 and Spark 1.0 found Mate#6 in less than 5 seconds!.
Now i think this is because they have this position in some datebase.I had having same situation with other positions,that is strange for me.
I was forgeting about Pedone and Murka,they found Mate#6 after 1 minute

Re: Simple mate in 6 that gives some engines trouble

Posted: Thu May 02, 2019 4:16 am
by rcmaddox
Deep HIARCS 14 announces the mate either instantly or in a few seconds.

Re: Simple mate in 6 that gives some engines trouble

Posted: Thu May 02, 2019 4:57 am
by Dann Corbit
I think the problem is null move pruning found in the strongest engines.
If you look at the pv, they give up 3 pieces in succession, including the queen!
Now, it is just a 12 ply combination. So it ought to be real simple.
But heavy pruning can push it way off into the distance.

Re: Simple mate in 6 that gives some engines trouble

Posted: Thu May 02, 2019 5:06 am
by chessmobile
Hiarcs gets it fast

Re: Simple mate in 6 that gives some engines trouble

Posted: Thu May 02, 2019 7:24 am
by rcmaddox
I couldn't get Komodo 11.2.2 to solve this mate at all. But Komodo 4 solves it in under 3 minutes.

Re: Simple mate in 6 that gives some engines trouble

Posted: Thu May 02, 2019 10:00 am
by duncan
Dann Corbit wrote:
Thu May 02, 2019 12:34 am
acn 883293; acs 2; bm Nh6; ce 32756; dm 6; pv Nh6 gxh6 Re5 dxe5 Qf6+ exf6 Ne3 dxe3 Rf5 g1=Q Rh5#;
Crafty takes a few seconds

Re: Simple mate in 6 that gives some engines trouble

Posted: Thu May 02, 2019 12:51 pm
by xr_a_y
Pretty one !
Minic needs "mateFinder" mode to get this one :

Code: Select all

12 9988 4321 109174781 32 2526 10621	g8h6 g7h6 e2e5 d6e5 b6f6 e7f6 d1e3 d4e3 f4f5 g2g1q f5h5 

Re: Simple mate in 6 that gives some engines trouble

Posted: Thu May 02, 2019 3:31 pm
by elcabesa
Vajolet finally found it after 45 minutes :)