﻿﻿ MatPlus.Net

Website founded by
Milan Velimirović
in 2006

21:28 UTC
 ISC 2022

Remember me

 CHESS SOLVINGTournamentsRating lists1-Apr-2022
 B P C F

MatPlus.Net Forum General Onemovers?

Page: [Previous] [Next] 1 2 3

For a legal position, here is an improvement of one over Kostas’s 31 There are 16 forced mates per side. It’s a symmetrical position as well with a mutual pin in the middle.

#1, Duplex
(= 10+10 )

EDIT: The a5 and h5 pawns have been removed.

The mutual pin is an excellent idea. It adds two mates effortlessly. The position works even without the pawns a5 and h4. Good job, James.

Many thanks Kostas. I have now removed the a5 and h5 pawns.

Most of the tasks that were mentioned here were addressed decades ago as Hauke already indicated. You can find tons of possible scenarios if you search for k='einz%gerrekord' on the PDB. For example for

Forced Duplex-mates with James' position in 1950: P1178852
The same with promoted force: P1180136
Forced Duplex-stalemates: P0005615

http://pdb.dieschwalbe.de/search.jsp?expression=PROBID=%27P1178852%27OR%20PROBID=%27P1180136%27OR%20PROBID=%27P0005615%27

Thanks Arno. Looks like I was completely anticipated 69 years ago!

Also, for an illegal position, see P1180673 with 48 forced duplex mates.

Spring cleaning Dept.:

EDIT: POSITION 1 DELETED, AMAUROSA PROBLEMISTA :-)

(= 4+9 )

All whites have exactly 1 move which mates (without promoted material)

El Bumpo:

(= 3+10 )

Each move of any side stalemates, and
each side has more than one

What is the point of your problems in the spring cleaning post?

Problems must have a point? :-)

For the record type "All White pieces have exactly
one move, and that mates":
#1 just saves a piece for the position I already gave
(since Alfred "demanded" :-),
#2 is a (not yet shown at all!) record for positions
with non-promoted material.

And since all (known to me!) records for duplex stalemating
have only one stalemate for the "weaker" sind, I added
one with 2+2 in el bumpo, just to demonstrate it's possible.

I've seen in this thread numerous onemovers with the multiple twin stipulations of #1, s#1, s=1, h#1, etc. I wonder if this is possible to do with AUW, either mixed or all for White.

Hauke,

If your record quest is not simply “self-entertainment” it’s good to specify your self-imposed conditions so others can admire, compete, learn etc.

In the first problem in 46, doesn’t wK have 5 moves, only one of which is mate?

In the second one, can’t you shift bB to d8, remove the d-file pawns, and stick bSg6 reducing by another unit?

In the third one duplex =1 2 sols, there are many units with no move, doesn’t this violate the idea that all pieces for player on the move have exactly one move?

What am I missing?

Thanks
Andrew

Lessee...

1. Stupidity on my part. Even more inexcusable as Alfred

2. This time YOU goofed :P Hint: g3 is a flight, since
I naturally lack a piece to protect it...

3. Different task: All moves of both sides stalemate,
all sides have >1 move. Should have indexed that clearer,
too late.

4. @Dylan: That would be harder to justify than a Babson :-)
EDIT: I have a position where 1.b8S#, 1.b8B! b1X#,
1.b8Q/R+? b1Q/R/B+! which you can easily reconstruct

Good point, Hauke, OK here is the "Letztform"

(= 4+8 )

#1 C+ this time using the full might of Popeye

Yup, that shaved off a piece fair and square. THX!

Here is another question. This is a brand-new correction of a position by me
posted 2020, probably in another thread I can't find at the moment:

(= 7+6 )

HR, CSE 2022/Apr/11, Any White move ends the game in one move,
all four results (#,s#,=,s=) possible

I remember a problem with a similar stipulation "White ends the game"
(also posted long ago on MPF, in another thread -
but I *don't* mean the Schmidt [which is BTW anticipated? - 407710 YACPDB]
or Djurasevic in *this* thread!), either by Eeltje Visserman or someone
from Finland (I just remember vowel constipation :-). I also dumped my
feenschach 6003 there. Can't find THAT thread either.

Niels Hoeg, Skakbladet 1907, 1st prize

Here's the problem:
https://chess.stackexchange.com/questions/13332/white-to-force-the-end-of-the-game-in-two-moves

Number 77 in "Chess Problems - Out of the Box":

I don't find the MPF thread, however, where this problem is.

Thus (I *did* have some vague memory that it contained an AUW
and the author a double vowel :-)
also the question of Dylan is answered in the positive.

(@Joost: one second. I've seen harder :-)

(59) Posted by Andrew Buchanan [Tuesday, Apr 12, 2022 02:49]

For the Type C promo case, reducing two queens to bishops seems wise in these tough economic times, and also saves one promotion overall:

(= 9+4 )
#1
(9 solutions as before)