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MatPlus.Net Forum General Construct the longest ser-x with a Black homebase
 
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(321) Posted by Olaf Jenkner [Sunday, Apr 17, 2022 20:42]

I forgot Pd5.
The correct position is cooked nevertheless:
1. e5 2. gxf6 3. Bxc5 4. Bb6 5. Ke7 6. Kd6 7. Kc5 8. Kb4 9. Ba5 10. Qe7 11. Qc5 12. d6 13. Bg4 ; a3+ Ka4/b3#
 
   
(Read Only)pid=23077
(322) Posted by Miodrag Mladenović [Monday, Apr 18, 2022 08:27]

(= 8+16 )

ser-hs#13 (C-)

Olaf found a cook (324)
 
   
(Read Only)pid=23079
(323) Posted by Olaf Jenkner [Monday, Apr 18, 2022 10:30]

Cooked:
1. hxg6 2. d5 3. Kd7 4. Kd6 5. Kc5 6. Sf6 7. Se4 8. Sxd2 9. Kc4 10. Kd3 11. Sc4 12. Rh1 ; Se1+ Rxe1#
 
   
(Read Only)pid=23080
(324) Posted by Miodrag Mladenović [Monday, Apr 18, 2022 11:55]

I am wondering if adding +wPd3 is preventing this cook. Also it's possible to add wPh6 if needed.

(= 9+16 )

ser-hs#13 (C?)
 
   
(Read Only)pid=23081
(325) Posted by Olaf Jenkner [Monday, Apr 18, 2022 15:20]

Michael Schreckenbach / Frank Richter
(= 4+16 )

ser-!#14 C+ (new Record)

1. Be2 2. g4 3. g5 4. g6 5. gxh7 6. hxg8=Q 7. Qh7 8. Qc2 9. Qxc7 10. Qxb8 11. Qxb7 12. Ka6 13. Bb5 14. Qxa7#
 
   
(Read Only)pid=23082
(326) Posted by Olaf Jenkner [Monday, Apr 18, 2022 16:02]

(324) is cooked:
1. hxg6 2. f5 3. Kf7 4. Kf6 5. Rh2 6. Rxg2 7. Kg5 8. Kh4 9. Kg3 10. Kf2 11. Ke2 12. Kxd3 13. Re2 ; Se1+ Rxe1#
 
   
(Read Only)pid=23083
(327) Posted by Miodrag Mladenović [Monday, Apr 18, 2022 16:35]

@(324) That's a diagram position but it looks like +wPh6 is preventing this cook:

(= 10+16 )

ser-hs#13 (C-)

Cooked by Olaf (327)
 
   
(Read Only)pid=23084
(328) Posted by Olaf Jenkner [Monday, Apr 18, 2022 17:02]

Cooked:
1. e6 2. Qg5 3. Qxg2 4. Ke7 5. f5 6. Kf6 7. Kg5 8. Kh4 9. Kg3 10. Kf2 11. Ke2 12. Kxd3 13. De2 ; Se1+ Qxe1#
 
   
(Read Only)pid=23085
(329) Posted by Olaf Jenkner [Tuesday, Apr 19, 2022 07:16]

Miodrag Mladenović / Olaf Jenkner
(= 10+16 )

ser-h#13

This is (316) with an additional queen.
I can't test it with brute force.
 
   
(Read Only)pid=23090
(330) Posted by Olaf Jenkner [Tuesday, Apr 19, 2022 07:18]

It's time for an eleventh interim balance. [Edit 04/22 08:34]

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-#hs13 . I didn't find cooks with the black king at 1st, 2nd, 3rd and 4th row. (3th 5 h, 4th 49 h computing time)

New record ser-!#16 MMM. The last record was ser-!#14 !

New record ser-r#11 .

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# ..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=23091
(331) Posted by Miodrag Mladenović [Tuesday, Apr 19, 2022 07:48]

@(328) I am wondering if this position is correct:
Dragan Stojnic/Miodrag Mladenovic
(= 10+16 )

ser-hs#13 (C?)
 
   
(Read Only)pid=23092
(332) Posted by Miodrag Mladenović [Tuesday, Apr 19, 2022 07:58]

(329) is cooked:

1.e7-e5 2.e5-e4 3.h7-h5 4.h5-h4 5.h4-h3 6.h3-h2 7.h2-h1=Q 8.Sg8*f6 9.Sf6-g4 10.Qh1-g1 11.Sg4-f2 12.Rh8-h2 13.Ke8-e7 1.Re1*e4+ Sxe4#
 
   
(Read Only)pid=23093
(333) Posted by Miodrag Mladenović [Tuesday, Apr 19, 2022 20:27]

@(330)
Olaf please add Dragan Stojnic as coauthor for ser-hs#13. My fault that I did not write it in a first place this over the diagram. It's slightly modified matrix by Dragan. I do not think I can take a full ownership of this problem.
 
   
(Read Only)pid=23098
(334) Posted by Dragan Stojnić [Tuesday, Apr 19, 2022 21:31]

It is pleasure to see at least one sucesfull mechanism for ser hs#13! I believed to 13 moves is probably possible, but 14 and over, it is questionable. Congratulations Miodrag
 
   
(Read Only)pid=23099
(335) Posted by Olaf Jenkner [Tuesday, Apr 19, 2022 22:19]

I'm trying to find a cook with black king at the 4th row. In (331) after 49 h no cook at 4th row was found.
It will take about 3 days. I'm not able to find cooks with
the black king on higher rows.
Miodrag cooked (329) with king at e7.
 
   
(Read Only)pid=23102
(336) Posted by Miodrag Mladenović [Wednesday, Apr 20, 2022 08:22]

version of (329)

Olaf Jenkner/Miodrag Mladenovic
(= 12+16 )

ser-hs#13 (C?)

Perhaps this position is correct. My cook does not work now when two white powns are added on g5 and h4.
 
   
(Read Only)pid=23107
(337) Posted by Dragan Stojnić [Wednesday, Apr 20, 2022 11:47]

Perhaps is however possible extension to 14 moves:
A)
D.Stojnić/ M.Mladenović
(= 11+16 )

ser hs#14 C?
B)
Also I see possibility for 15 moves, but with lesser hope to be correct:
version
(= 12+16 )

ser hs#15 C?
 
   
(Read Only)pid=23114
(338) Posted by Miodrag Mladenović [Wednesday, Apr 20, 2022 13:07]

@(337) Very nice attempt but unfortunately cooked:

1.c7*d6 2.Qd8-c7 3.Qc7*c2 4.Ke8-d8 5.Kd8-c7 6.Kc7-b6 7.Kb6-c5 8.Kc5-c4 9.Kc4-d3 10.Kd3-e2 11.Ke2-f2 12.Kf2*g3 13.Qc2*d1 + Bd2-e1 +

Perhaps it's possible to fix it but it will not be an easy task to do.
 
 
(Read Only)pid=23115
(339) Posted by Dragan Stojnić [Wednesday, Apr 20, 2022 15:37]

Perhaps this setting would be succesfull:
D.Stojnić/M.Mladenović
(= 12+16 )

ser hs#14 C? new attempt
 
   
(Read Only)pid=23117
(340) Posted by Miodrag Mladenović [Wednesday, Apr 20, 2022 17:52]

@(339) Cook:

1.e7-e5 2.e5-e4 3.e4*f3 4.f3*e2 5.e2*f1=B 6.f7-f6 7.h7-h5 8.Sg8-e7 9.Se7*g6 10.Sg6*h4 11.Sh4-f3 12.g7-g5 1.Bg4*h5+ Rxh5#
 
 
(Read Only)pid=23118

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MatPlus.Net Forum General Construct the longest ser-x with a Black homebase