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MatPlus.Net Forum General Construct the longest ser-x with a Black homebase
 
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(341) Posted by Dragan Stojnić [Wednesday, Apr 20, 2022 18:40]

It is very difficult to found correct setting with 14.
Attempt without Bg4?

D.Stojnić/M.Mladenović
(= 11+16 )

ser hs#14 C?
 
   
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(342) Posted by Georgy Evseev [Wednesday, Apr 20, 2022 19:03]

1-3.Sc6-d4xf3 4-5.Sf6-h5 6.f6 7-10.Kf7-e6-f5-e4 11-13.exd6-d5-d4 & Sg3+ Sxg3#
 
   
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(343) Posted by Olaf Jenkner [Wednesday, Apr 20, 2022 21:45]

Michael Schreckenbach
(= 4+16 )

ser-!#16 MMM C+

1. g5 2. Sg4 3. Se5 4. Sxd7 5. Sxf8 6. Sxh7 7. Sf8 8. Sg6 9. Sxe7 10. Sf5 11. Sg3 12. Sh5 13. Kg3 14. Kh4 15. Bg3 16. g6 !#

A new record. Unbelievable - two moves more than the old one. And such a beautiful problem!
Congratulations to Michael!
 
   
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(344) Posted by Miodrag Mladenović [Thursday, Apr 21, 2022 06:46]

@(343) Popeye gives me a cook in 7 moves when I set the condition ser-!#16. So MMM is changing something. Can you give us explanation what does MMM means? How to enter this condition in Popeye (if Popeye supports this type of problems)?
 
   
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(345) Posted by Olaf Jenkner [Thursday, Apr 21, 2022 08:29]

See (76), (77), (80) and (108).

The cook
1. Ke4 2. Kd5 3. Bxc7 4. Bd6 5. Bxe7 6. Kd6 7. Kxd7#
does not work because 7. Kxd7 is illegal (white majesty meets black majesty).
 
   
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(346) Posted by Miodrag Mladenović [Thursday, Apr 21, 2022 10:12]

@(345) Thanks for explanation. There were so many posts and I missed this one at the time.
 
   
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(347) Posted by Joost de Heer [Thursday, Apr 21, 2022 10:43]

@344 as far as I know neither Popeye nor Jacobi have a 'no king's contact' option, but Winchloe has one.
 
   
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(348) Posted by Olaf Jenkner [Friday, Apr 22, 2022 00:50]

Michael Schreckenbach
(= 3+16 )

ser-r#11 C+

1. f4 2. f5 3. f6 4. fxe7 5. exd8B 6. Bxc7 7. Bb6 8. Bxa7 9. Kb6 10. Kc7 11. Bb6 Sa6#

New record, congratulations!
 
   
(Read Only)pid=23130
(349) Posted by Olaf Jenkner [Friday, Apr 22, 2022 19:25]

Arno Tüngler / Michael Schreckenbach
(= 5+16 )

ser-=19 C+

1. Bh5 2. g4 3. g5 4. g6 5. gxh7 6. hxg8Q 7. Qxh8 8. Qxg7 9. Qg1 10. Qxa7 11. Qxa8 12. Qb8 13. Qxc7 14. Qb6 15. c7 16. cxd8B 17. Bxe7 18. Bxf8 19. Bd6=

New record, congratulations!
It's a modification of the previous record (159).
 
   
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(350) Posted by Olaf Jenkner [Friday, Apr 22, 2022 19:27]

It's time for a twelfth interim balance.

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.

New record ser-=19 .

Current records are:

Ser-# ...11 ........... (39) Arno Tüngler (starter)
Ser-= ...19 .......... (349) Arno Tüngler / Michael Schreckenbach
ser-s# ..17 .......... (124) Frank Richter
ser-s# ..17 .......... (128) Michael Schreckenbach
ser-s= ..22 .......... (113) Michel Caillaud (C?)
Ser-r# ..11 .......... (348) Michael Schreckenbach
Ser-r= ..17 .......... (273) Joost de Heer (C?)
Ser-!# ..14 .......... (325) Michael Schreckenbach / Frank Richter
Ser-!# MMM 16 .. (343) Michael Schreckenbach
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# .13 ........ (331) Dragan Stojnić / Miodrag Mladenović (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=23138
(351) Posted by Miodrag Mladenović [Friday, Apr 22, 2022 21:59]

(= 9+16 )

ser-r=23 (C?)

Solution:
1.h2-h4 2.h4-h5 3.h5-h6 4.h6*g7 5.g7*f8=B 6.Bf8*e7 7.Be7-a3 8.b2-b4 9.Rb1-b2 10.Ba2-b1
11.Qc4-a2 12.Kd4-c4 13.d2-d4 14.d4-d5 15.d5-d6 16.d6*c7 17.c7*b8=R 18.Rb8*c8 19.Rc8-c7 20.Rc7*d7
21.Rd7-d3 22.Rd3-b3 23.Kc4-c3 b7-b5=

This one is correct ser-a=>b23 (Popeye 4.87).
 
   
(Read Only)pid=23140
(352) Posted by Miodrag Mladenović [Friday, Apr 22, 2022 22:25]

Or even 4 more moves:

(= 9+16 )

ser-r=27 (C?)

The final position after the solution is:
(= 9+9 )


After 40 minutes of testing Popeye confirmed that last 26 moves are correct ser-a=>b26. It looks like ser-a=>b27 will run forever. I'll leave Popeye to run over the night.

Here is the solution:

1.Ra1-b1 2.Sb3-a1 3.Bc4-a2 4.Qh4-c4 5.h2-h4 6.h4-h5 7.h5-h6 8.h6*g7 9.g7*f8=B 10.Bf8*e7 11.Be7-a3 12.b2-b4 13.Rb1-b2 14.Ba2-b1 15.Qc4-a2 16.Kd3-c4 17.d2-d4 18.d4-d5 19.d5-d6 20.d6*c7 21.c7*b8=R 22.Rb8*c8 23.Rc8-c7 24.Rc7*d7 25.Rd7-d3 26.Rd3-b3 27.Kc4-c3 b7-b5=
 
 
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(353) Posted by Arno Tungler [Friday, Apr 22, 2022 22:31]

Thank you very much for the great idea to add the 19th move in the Ser-=, Michael! And for the testing, Olaf! Now remains the logical question: could the wK also be on h5 and we have 20 moves?? Probably not but…

EDIT: Of course not, even your cook at (178) works…
 
   
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(354) Posted by Olaf Jenkner [Friday, Apr 22, 2022 22:34]

Of course not, it ist cooked in 19. You can check it by yourself.
 
 
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(355) Posted by Dragan Stojnić [Friday, Apr 22, 2022 22:38]

(351)
Maybe Rc1 instead Sa1, is it ser r=24?

# I wrote post and missed post 352 in meantime...
 
   
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(356) Posted by Dragan Stojnić [Friday, Apr 22, 2022 23:25]

(352)
Maybe with Ra2 can ser r=28 (1.Ra1...), or more risk with Rb4 ser r=29?
 
   
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(357) Posted by Joost de Heer [Friday, Apr 22, 2022 23:53]

@(352) Cooked:
1. Rb1 2. Sa1 3. Ba2 4. Qc4 5. b4 6. h4 7. h5 8. h6 9. hg7 10. gh8=B 11. Bb2 12. Ba3 13. Rb2 14. Bb1 15. Qa2 16. Kc4 17. d4 18. d5 19. d6 20. dc7 21. cb8=R 22. Rc8 23. Rc7 24. Rd7 25. Rd3 26. Rdb3 27. Kc3 b5=
 
   
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(358) Posted by Joost de Heer [Saturday, Apr 23, 2022 00:17]

@(351) cooked:
1.h4 2.Kc3 3.d4 4.d5 5.h5 6.d6 7.h6 8.dxe7 9.hxg7 10.exf8=B 11.gxh8=R 12.Ba3 13.b4 14.Rb2 15.Bb1 16.Qa2 17.Kc4 18.Rxh7 19.Rxf7 20.Rxd7 21.Rd3 22.Rdb3 23.Kc3 b5=

Found by Jacobi with the following input file:
fors rsbqkbsr/pppppppp/8/8/2QK4/8/BPPP3P/SR6
stip ser-*a=>b22 pieces white kc4 qa2 rb2 rb3 ba3 bb1 sa1 pb4 pc2 black pb7 qd8 addpieces
test not dia pieces bla pd7 addpieces
stip r=1
 
   
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(359) Posted by Miodrag Mladenović [Saturday, Apr 23, 2022 05:26]

It looks like two promotions will not work. Perhaps this one is correct:

(= 9+16 )

ser-r=19 (C?)
 
   
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(360) Posted by Miodrag Mladenović [Saturday, Apr 23, 2022 05:35]

(A)
(= 10+16 )

ser-r=25 (C?)

or

(B) if wPa6 helps to prevent cook
(= 11+16 )

ser-r=25 (C?)

If this one is incorrect perhaps moving wRa1 => b1 gives a correct ser-r#24. The white rook on a1 perhaps can come to b2 from a2 square. I am running a Popeye trying to prove that ser-a=>b25 is correct but it takes forever and I am not sure if I'll be able to complete this test because I do not have desktop for testing and for laptop it's not recommended to run it 24+ hours without turning off.
 
   
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MatPlus.Net Forum General Construct the longest ser-x with a Black homebase