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MatPlus.Net Forum General Rare stipulations

### Rare stipulations

Just for curiosity, I searched the PDB for the stipulation
"castling". Not much there, most ser-00 with fairy conditions.
(James did one direct ortho 00 :-)

I wonder if "e.p." was ever a stipulation in the directmover genre.
(Maybe ser-e.p. with neutrals? :-) Other fairies do exist, Annan
seems to be a favorite). A 1st test:

(= 6+3 )

e.p. in 4, 2 sol.
Clearly the white move before e.p. must be checking. (Clarification:
if the side e.p.-ing is not specified, this works both ways:
forcing a pawn doublestep or forcing capture of a checking pawn,
but in the latter case, stalemate also works as reason)

(= 6+6 )

E. Eginton, The fairy chess review 1939
ep-3
1. Bd2 zz
1... b4 2. Qxb4 c5 3. dxc6ep
1... Rb8 2. Bb4 c5 3. dxc6ep

I used it in a problem:

Problemas 2013
(= 10+10 )

-1 & 1.bxa6 e.p.

Solution: -1.Rb8xQc8#! (-1.Ra8xQc8#?) & the en passant capture becomes possible.

Well, Hauke, if you wish for those stipulations to be used, here is a start. :-)

ep-19
(= 11+10 )

1. c8=Q Nd2 2. Bg5 Bg1 3. Bh6 Bh2 4. Bf8 Bg1 5. Bg7 Bh2 6. Bh6 Bg1 7. Bg5 Bh2 8. Bh4 d3 9. Bg5 Bg1 10. Bh6 Bh2 11. Bf8 Bg1 12. Bg7 Bh2 13. Bh6 Bg1 14. Bg5 Bh2 15. Bh4 Bg1 16. Bxg3 Bh2 17. Bxh2 N~ 18. Q(x)c4+ b5+ 19. axb6+

@Hauke: your begin composition has 5 solutions (1. Qa8/Qb8/Qc8 Kxe7 2. Sf5 Ke6 3. Qa2/Qb3/Qc4 d5 4. ed6ep and 1. Qg8/Qh8 Kxe7 2. Sd5 Ke6 3. Qg3/Qh2 f5 4. ef6ep)

Some ser-hep's:

(= 14+7 )

Milomir Babic, Problemkiste 1998
ser-hep-5 12.1.1...

(= 13+7 )

ser-hep76

Joost made their ser-h-ep 76 subsequently to my ser-h-ep 57: https://juliasfairies.com/problems/no-1640/

The publication for those who can view it:

@Joost: I already expected that (more solutions than intended) and didn't
even bother to check :-)
@everybody else: THX for the input. BTW, evidently Bd2 in
the vintage problem is only ZZ if ep (or ep with #) is the
stipulation, since Bb4# is the threat.

(9) Posted by Hauke Reddmann [Friday, Nov 5, 2021 12:53]

@James:

(= 8+9 )

Remember, also a *black* ep may be forced ;-) This matrix does not work *yet*: Black plays h2 when a pawn is on a5. Feel free to repair :-)