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MatPlus.Net Forum General Graz helpmate definition
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(1) Posted by Hauke Reddmann [Sunday, May 15, 2022 18:12]

Graz helpmate definition

(= 3+2 )

(HR, Demo) GH in 2

Yesterday in Lüneburg we had a small discussion
about the definition of GH. Is the interpretation below correct?

In any GH variant, both mating moves must be present.
This means that...
Qd4 b7 Qg7#/Qa1 (b8Q#) is a solution
Qg4 b7 Qg7#/Qc8 (bc8Q#) is a solution
Qh3 b7 ???/Qc8 is irrelevant as Black has no mate
Qg3 b7 Qg7/??? is irrelevant as White has no mate
Qf6# is also irrelevant for the same reason
(Read Only)pid=23236
(2) Posted by seetharaman kalyan [Sunday, May 15, 2022 18:56]

(Read Only)pid=23237
(3) Posted by shankar ram [Sunday, May 15, 2022 19:27]

Your interpretation is correct. Black should have the option to #1/h#1 in the same move.
See this article for a review of such reciprocal stipulations:
(Read Only)pid=23238
(4) Posted by Hauke Reddmann [Sunday, May 15, 2022 21:55]

That's interesting: It means that there is, no, not only a
Graz mate etc. (already exists), but also a specific
generalized Graz try:

Combine any two (or more) stipulations which must be fulfillable
in the last move/move pair, then you can insert tries
where one stipulation is NOT fulfilled.

Random example: Shortest game where White can mate and
stalemate with his last move.

Obviously, this greatly reduces the chance of cooks.
(Read Only)pid=23239
(5) Posted by Joost de Heer [Sunday, May 15, 2022 22:19]

What's the diffenrence between reci-h# and Grazer h#?
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(6) Posted by shankar ram [Monday, May 16, 2022 00:29]

No difference. Two names for the same thing.
(Read Only)pid=23241

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MatPlus.Net Forum General Graz helpmate definition