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

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Spielverderber!

@(200) Good question. I do not have a good answer why not other than I missed this one :).

Here is the correction:
(= 16+16 )

ser-hs=18 (C-)

Solution is same. Just the last white move is 18...Bxf7+ 19.Kxf7=

Sorry, Miodrag, this is illegal position ... Bh5 and Pe2g2.

Edit: I see, diagram already corrected.

Qh3 ser-hs=19

@(203) I corrected position. You are fast, I did not have enough time to update diagram.

@(204) The position with WQh3 is incorrect. Black rook will capture the wBh5 instead of wQh3 and then the last white move will be Qxd7+.

.. 9.Rxh5 10.Rxg5 11.Rxf5 12.Rxf2 13.Rxg2 14.Rxh2 15.Rxe2 16.Rxc2 17.Rxc3 18.Rxb3 19.Rb2 Qxd7+ 20.B,Q,Kxd7=

Perhaps wQh2 and wPh3. But not sure if this one is correct.

(= 16+16 )

ser-hs=19 (C?)

It's time for an eighth interim balance. [Edit 04/09 11:33]

(91) and (65) have been cooked.
It's hard to find the current record. It might be (113).
Several attempts surpass his problem but the might be cooked as well.

(206) has been cooked, current record is (202).

In ser-r= much longer problems might be possible.

In (214) the black king is in check. In order not to spoil the previous record, I added a new section.

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
Ser-r# ..10 .......... (145) Joost de Heer
Ser-r= ..11 .......... (155) Joost de Heer
Ser-!# ..13 .......... (127) Joost de Heer / Michael Schreckenbach
Ser-!# MMM 14 .. (74) Frank Richter
Ser-!# MMM 14 .. (78) Joost de Heer
Ser-!= ..26 .......... (118) Dragan Stojnić (C?)
Ser-h# .KNC 11 .. (42) Michel Caillaud / Arno Tüngler
Ser-h# .. 13 ........ (214) Miodrag Mladenović
Ser-hs# .12 ........ (189) Miodrag Mladenović / Dragan Stojnić (C?)
Ser-hs= .18 ........ (202) Mladenović / Tüngler (C?)

Everybody is invited to surpass one of the entries or to cook one marked C?.

@(65) Ser-s=21 is cooked with
1.Bd5 2.Be5 3.c4 4.c5 5.c6 6.Bxc7 7.cxb7 8.bxc8=S 9.Sxa7 10.Bxa8 11.b7 12.Sb5 13.Kb6 14.Ka7 15.Bd6 16.Bxe7 17.Bxf8 18.Bxg7 19.Bxh8 20.g7 21.Sc7+ Qxc7=

Both positions are incorrect. Solution does not work. I made mistake.

This is proving to be a great and popular thread with more than 200 posts and many excellent originals. Thanks James

@206 cooked with 1.Sf6 2.Sd5 3.Sxc3 4.Sa4 5.cxd6 6.Qxa5 7.Qxf5 8.Qxg5 9.Qxh4 10.Qxh3 11.Qxh2 12.Qxg2 13.Qxf2 14.Qxe2 15.Qxc2 16.Qxb3 17.d5 18.Sc6 19.Sd8 Bxf7+

On Arno's post (165)
I disagree.
In general (series)reflexmates or -stalemates should be published as helpmates or -stalemates with switched colors and rotated boards.
That's fairy economy: Avoid additional fairy stipulations if it's possible.
In this thread we are looking for the longest seriesmovers with black homebase. And we tried a lot of stipulations to build problems.
So there is no reason to exclude the section seriesreflexmates or -stalemates.
We can open another thread with white homebase. The longest serieshelpmates or -stalemates have been found already.

(= 5+16 )

ser-h#11 (C+)

(= 7+16 )

ser-h#13 (C+)

Another reason why ser-h with white homebase and ser-r with black homebase are different: In a ser-r=, there may be multiple black last moves (e.g. white's last move is a capture on d7, after which black stalemates with Sxd7/Bxd7/Qxd7/Kxd7, in a ser-h= that would be unacceptable.

Why problem 214 is not also record for ser h# KNC?
After 1st move it is regular ser h#12, one move longer if compare to 42(Caillaud/Tungler)

After first move it is not a homebase.

Maybe Miodrag is also still testing this... At least for that final mate there is only this solution!

(= 4+16 )

Ser-h#15 C?

1.cxd6 2.Sxa6 3.Sc5 4.a5 5.a4 6.a3 7.Ra4 8.Qa5 9.Kd8 10.Kc7 11.Kb6 12.Kb5 13.Kb4 14.b5 15.Sb3 Sa2#

Would be a small miracle if this is correct...

Cooked in 14:
1. cxd6 2. b5 3. b4 4. Sxa6 5. Sc5 6. Sa4 7. Ba6 8. Bb5 9. Qb6 10. O-O-O 11. Kb7 12. Ka6 13. Ka5 14. a6 Sb3#

What if a wPb3 is added?