Simple mate in 6 that gives some engines trouble

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Dann Corbit
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Simple mate in 6 that gives some engines trouble

Post by Dann Corbit » 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#;
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camava
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Full name: mario varela

Re: Simple mate in 6 that gives some engines trouble

Post by camava » 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.

camava
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Full name: mario varela

Re: Simple mate in 6 that gives some engines trouble

Post by camava » Thu May 02, 2019 4:03 am

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

rcmaddox
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Re: Simple mate in 6 that gives some engines trouble

Post by rcmaddox » Thu May 02, 2019 4:16 am

Deep HIARCS 14 announces the mate either instantly or in a few seconds.

Dann Corbit
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Re: Simple mate in 6 that gives some engines trouble

Post by Dann Corbit » Thu May 02, 2019 4:57 am

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.
Taking ideas is not a vice, it is a virtue. We have another word for this. It is called learning.
But sharing ideas is an even greater virtue. We have another word for this. It is called teaching.

chessmobile
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Re: Simple mate in 6 that gives some engines trouble

Post by chessmobile » Thu May 02, 2019 5:06 am

Hiarcs gets it fast

rcmaddox
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Re: Simple mate in 6 that gives some engines trouble

Post by rcmaddox » Thu May 02, 2019 7:24 am

I couldn't get Komodo 11.2.2 to solve this mate at all. But Komodo 4 solves it in under 3 minutes.

duncan
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Re: Simple mate in 6 that gives some engines trouble

Post by duncan » Thu May 02, 2019 10:00 am

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

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xr_a_y
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Re: Simple mate in 6 that gives some engines trouble

Post by xr_a_y » Thu May 02, 2019 12:51 pm

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 

elcabesa
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Re: Simple mate in 6 that gives some engines trouble

Post by elcabesa » Thu May 02, 2019 3:31 pm

Vajolet finally found it after 45 minutes :)

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