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MatPlus.Net Forum General Construct the longest ser-x with a Black homebase
 
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(281) Posted by Miodrag Mladenović [Wednesday, Apr 13, 2022 17:27]

Here are my latest attempts (versions of the same problem):

A-17
(= 12+16 )

ser-hs#17

B-16
(= 11+16 )

ser-hs#16

C-15
(= 10+16 )

ser-hs#15

D-14
(= 9+16 )

ser-hs#14 (or wSb1 => a1)

E-13
(= 9+16 )

ser-hs#13
 
   
(Read Only)pid=23011
(282) Posted by Olaf Jenkner [Wednesday, Apr 13, 2022 19:13]

It's time for a tenth interim balance. [Edit 04/18 15:26]

It's hard to find the current record in section Ser-s= . It might be (113).
Several attempts surpass his problem but the might be cooked as well.

(273) replaced (234).

All attemps in (281) were cooked, (237) as well.
(314) is a new attempt.

New record ser-!#14 . This record also fits the stipulation MMM.

Current records are:

Ser-# ...11 ........... (39) Arno Tüngler (starter)
Ser-= ...18 .......... (159) Arno Tüngler
ser-s# ..17 .......... (124) Frank Richter
ser-s# ..17 .......... (128) Michael Schreckenbach
ser-s= ..22 .......... (113) Michel Caillaud (C?)
Ser-r# ..10 .......... (145) Joost de Heer
Ser-r= ..17 .......... (273) Joost de Heer (C?)
Ser-!# ..14 .......... (325) Michael Schreckenbach / Frank Richter
Ser-!# MMM 14 .. (74) Frank Richter
Ser-!# MMM 14 .. (78) Joost de Heer
Ser-!# MMM 14 .. (325) Michael Schreckenbach / Frank Richter
Ser-!= ..26 .......... (118) Dragan Stojnić (C?)
Ser-h# .KNC 11 .. (42) Michel Caillaud / Arno Tüngler
Ser-h# .. 15 ........ (222) Arno Tüngler / Miodrag Mladenović
Ser-hs# .12 ........ (314) Dragan Stojnić (C?)
Ser-hs= .18 ........ (202) Miodrag Mladenović / Arno Tüngler (C?)

Everybody is invited to surpass one of the entries or to cook one marked C?.
 
   
(Read Only)pid=23012
(283) Posted by Dragan Stojnić [Wednesday, Apr 13, 2022 20:19]

(281)I see authors solutions.
Start however with a5,a4,Ra5 etc.
Next checking...
 
   
(Read Only)pid=23013
(284) Posted by Dragan Stojnić [Wednesday, Apr 13, 2022 22:06]

Probably I found cooks in
281 A,B,C.

B 16 cooked in 15
One of possibilities: 1.Sf6 2.Sd5 3.Sxc3 4.Sa6 5.Sc5 6.e5 7.Qf6 8.Qe6 9.Qa2 10.Qb1 11.Ke7 12.Kd6 13.Kd5 14.Kd4 15.d5 - Sb3+ Sxb3#

B15 same cook

A 17 cooked in 16:
...7.c6 8.cb5 9.Qa5 10.Qa2 11.Qb1 12-16.same as 11-15 in B 16 cook

Other versions are shorter in comparation with joint 280, ser hs#15 (C?).
Do have objections about 280?
 
   
(Read Only)pid=23015
(285) Posted by Dragan Stojnić [Wednesday, Apr 13, 2022 22:16]

Olaf, I propose to you wait 3-4 days after publication new versions -candidates for records.
It is need time for details test. After 3 or 4 days if no objections, then include it in list
 
   
(Read Only)pid=23016
(286) Posted by Olaf Jenkner [Wednesday, Apr 13, 2022 23:07]

I would like to reduce the clutter. After some days there are so much new proposals.
I think it's better to show the current record even if it will be cooked after a short time.
The record in section ser-s= is not clear until now. I did not include the longest proposals but what to do?
If nobody claims a cook the longest should enter the list.
 
   
(Read Only)pid=23017
(287) Posted by Dragan Stojnić [Wednesday, Apr 13, 2022 23:20]

More about 281 A 17 also have another cook in only 15:
1.h5 2.h4 3.Rh5 4.Rc5 5.Rc3 6.Rc5 7.e5 8.e4 9.Qf6 10.Ke7 13.Kd4 14.ed3 15.Qf1 - Qd3+ Qxd3#

At 281 B if remove Sa1 (which make founded cook) from board maybe exist chance for correct ser.hs#15 , or if remove to c4 maybe save 16 moves, but it is need details analyse...
Please wait...
 
   
(Read Only)pid=23018
(288) Posted by Miodrag Mladenović [Thursday, Apr 14, 2022 06:47]

@(286)
Olaf, I recommend that when you summarize tasks you publish two lists. One is with C+ problems and the other one with C? problems. Then everyone will know what are the computer tested tasks and what are the other tasks.
 
 
(Read Only)pid=23019
(289) Posted by Miodrag Mladenović [Thursday, Apr 14, 2022 07:02]

@(280) Cook:

1.Sxf6 2.Sd5 3.Sc3 4.e6 5.Qe7
6.Qxd6 7.Qa6 8.Qxa2 9.Qxb1 10.Ke7
11.Kd6 12.Kc5 13.Kd4 14.Sa6 15.Sc5 Sb3+ 16.Sxb3#

It looks like Sb3+ is too dangerous move and that we should avoid it.

My new candidate is:

A-17
(= 12+16 )

ser-hs#17 (C?)

B-16 (A without wQb4) (C?)

C-15 (B without wRc4) (C?)

Also, it's possible to move wQb4 => b3 & wRc4 => c3 if it prevents some cooks. Very difficult to check this position. There are so many possibilities.
 
   
(Read Only)pid=23020
(290) Posted by Dragan Stojnić [Thursday, Apr 14, 2022 10:12]

(289) Great challenge for test, I agree, it is need time...
 
   
(Read Only)pid=23024
(291) Posted by Georgy Evseev [Thursday, Apr 14, 2022 10:30]

(289)
A-17
1.h5 2-8.Rh6xf6-e6xe1-c1xc4-c1 9-11.f5-f4-f3 12-13.Kf7-f6 14.c6 15.Qc7 & Qf4 Qxf4#
 
   
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(292) Posted by Dragan Stojnić [Thursday, Apr 14, 2022 11:38]

(289) A 17b (with Qb3,Rc3) also cooked similar as 281 ago with mate on d3:
2.h4 3.Rh5 4.Rd5 5.Rc5 6,Rc3 7.Rc5 8.e5 9.e4 10.Qf6 11.Qb6 12.Qb5 13.Ke7 14.Kd6 15.Ke5 16.Kd4 17.ed3 - Qxd3+ Qxd3#
 
   
(Read Only)pid=23027
(293) Posted by Dragan Stojnić [Thursday, Apr 14, 2022 11:45]

Maybe in 289 A17 use Bc3 instead Qb4 can save ser hs#17?
What you think Miodrag?
 
   
(Read Only)pid=23028
(294) Posted by Miodrag Mladenović [Thursday, Apr 14, 2022 11:55]

@(293) Maybe this will work with a white bishop on c3 instead of white queen on b4. Who knows?
 
   
(Read Only)pid=23029
(295) Posted by Dragan Stojnić [Friday, Apr 15, 2022 01:02]

(293) propose with Bc3 (instead Qb4) however is cooked, unbelievable:
1.Sf6 2.Sd5 3.d6 4.Kd7 5.Kc6 6.Kb5 7.Ka6 8.b5 9.bc4 10.Sc6 11.Sa5 12.Bb7 13.Sf4 14.Qd7 15.Qa4 16.Qa2 17.Qb1- Bxc4+, Sxc4#

Next test for 289 B16...
Chance is maybe 60:40 for correct setting, but who know...
 
   
(Read Only)pid=23033
(296) Posted by Dragan Stojnić [Friday, Apr 15, 2022 02:29]

Sorry, B16 from 289 also cooked-
1.e5! 2.Bc5 3.Qf6 4.d6 5.Be6 6.Bd5 7.Be4 8.Bg6 9.Qf5 10.a5 11.Ra7 12.Kd7 13.Kc6 14.Kb5 16.Bb6 - Rc1+!,Qxd3#
For C15 I will continue check tomorrow ...
 
   
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(297) Posted by Olaf Jenkner [Friday, Apr 15, 2022 22:16]

(281 D-14 with Sa1) is cooked.
1. Sxf6 2. Sd5 3. Sc3 4. Sxa2 5. Sb4 6. S8a6 7. Sxc5 8. e5 9. Ke7 10. Kxd6 11. Kd5 12. Kd4 13. d5 14. Bg4 Sb3+ Sxb3#

(281 D-14 with Sb1) is cooked as well.
1. b5 2. e5 3. e4 4. Sa6 5. Sxc5 6. Qxf6 7. Qf1 8. Ke7 9. Kxd6 10. Kd5 11. exd3 12. Kc4 13. Sf6 14. Sd5 ; Re4+ Sxe4#
 
   
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(298) Posted by Miodrag Mladenović [Saturday, Apr 16, 2022 13:27]

(= 8+16 )

ser-hs#13 (C?)
 
   
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(299) Posted by Dragan Stojnić [Saturday, Apr 16, 2022 14:10]

Then 289 C15 is cooked by 1.a6 2.ab5 and rest as in 281 D 14(Sb1 var), finished Se4#
 
 
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(300) Posted by Miodrag Mladenović [Saturday, Apr 16, 2022 14:18]

[deleted]
my message is somehow doubled. Check the next post.
 
 
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MatPlus.Net Forum General Construct the longest ser-x with a Black homebase