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Simple mate in 6 that gives some engines trouble
Posted: Thu May 02, 2019 2:34 am
by Dann Corbit
[d]b4bN1/4p1p1/1Q1p2K1/q1np4/3p1Rnk/6pr/4Rppr/3N4 w - - 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 5:09 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 6:03 am
by camava
camava wrote: ↑Thu May 02, 2019 5:09 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 6:16 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 6:57 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 7:06 am
by chessmobile
Hiarcs gets it fast
Re: Simple mate in 6 that gives some engines trouble
Posted: Thu May 02, 2019 9:24 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 12:00 pm
by duncan
Dann Corbit wrote: ↑Thu May 02, 2019 2:34 am
[d]b4bN1/4p1p1/1Q1p2K1/q1np4/3p1Rnk/6pr/4Rppr/3N4 w - - 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 2:51 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 5:31 pm
by elcabesa
Vajolet finally found it after 45 minutes
