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

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With a knight at c3 or g3 you have the longest black homebase without any pawn moves (ser-s#11 C+)

QUOTE

With a knight at c3 or g3 you have the longest black homebase without any pawn moves (ser-s#11 C+)

Why not Sb1/Sh1 for a ser-s#12?

Cook 1.Qxc7 2.Qxb7 3.Sf2 4.Sg4 5.Se5 6.Sxd7 7.Sxb8 8.Sc6 9.Sxe7 10.Kc6 11.Sxc8 12.Qd7+ Qxd7#

Here is another position without powns in 11 moves:

(= 3+16 )

ser-s#11 (C+)

Really an interesting idea, many thanks to James!

Other related challenges, that come in mind:

Longest ser-s= with black Homebase?
Longest ser-h# with black Homebase?

QUOTE

Cook 1.Qxc7

Ah yes, overlooked that Sb1/h1 can reach e5 in 3 moves, but Sb3/g3 can't in 2.

(= 3+16 )

ser-s=13 (C+)

Here is the ser-s= starter.

(= 4+16 )

ser-h#7 (C+)

Here is the ser-h# starter.

-

Blank

(= 4+16 )

ser-h#8 (C+)

Oops, cooked with Kh5.

@Joost(32), sorry but I did not understand this cook Kh5? I checked my ser-h#8 with Gustav and it shows C+! Are you referring to some other problem?

Yes, was an attempt at ser-h#9 which was horribly cooked.

(= 5+16 )

ser-h#9 (C+)

By adding one dummy WPd4 I managed to achieve 9 moves.

Not sure why my post has been published twice. Since I do not have an option to remove post I'll just delete this second diagram.

(= 4+16 )

Ser-h#10 c?

Edit: Cooked!

@Frank: ser# now :-)

(= 2+16 )

ser#10
This is a random test position. 4 solutions were found using 10s
testing time on my trust old Zuse, so this should be manageable...
(Kg5 Pg6 *almost* works, #8 2sol. Maybe more material.)

EDIT:
(= 3+16 )

ser#4, 2 solutions

Serious again

(= 2+16 )

Ser-#11 C+

(40) Posted by Olaf Jenkner [Monday, Mar 21, 2022 18:15]

Arno's Ser-h#10:
Intended solution:
1.c5 2.Qa5 3.Kd8 4.Kc7 5.Kb6 6.Kb5 7.Kb4 8.Ka3 9.Ka2 10.Qa3 Sc3#
Cook:
1.a5 2.a4 3.c5 4.Ra6 5.Qa5 6.Kd8 7.Kc7 8.Kb6 9.Kb5 10.c4 b3xc4#