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MatPlus.Net Forum Twomovers Most mates by a promoted queen in a #2?
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(1) Posted by James Malcom (Rewan Demontay) [Monday, Jan 25, 2021 22:59]

Most mates by a promoted queen in a #2?

I know that every piece has had its maximum amount of mates shown, aka Q12, R14, B13, S8, P6, & K6. But what of a promoted queen? The interest lay in that since the key move must be a promotion, the new queen is right away restricted in its range. Discovered checks aren't allowed, namely because Petrovic's #2 does it.

I've managed 8 different mates using zugzwang.

(= 7+9 )

(Read Only)pid=20541
(2) Posted by Hauke Reddmann [Tuesday, Jan 26, 2021 11:41]

For about ten minutes you made me feel old. You are constantly keeping me off finishing my master thesis, y'know :-)

(= 10+8 )

P.S. 9*#, but a 10th unthematic after Qe5. You can insist on
no "additional" mates, in which case this attempt doesn't count.
P.P.S. No finds in the Albrecht up to now.
(Read Only)pid=20546
(3) Posted by James Malcom (Rewan Demontay) [Tuesday, Jan 26, 2021 18:00]

Good job Hauke. I knew you had it in you to overtake mine. :) Your QvQ dual adds extra thematic content.

And extra mates are perfectly fine. As long there are no mating duals by the queen! (Of which you have none.)
(Read Only)pid=20550
(4) Posted by Hauke Reddmann [Tuesday, Jan 26, 2021 20:32]

Well, I think you can manage 10 (11 are possible by the matrix) if you study all the tricks of the classic Queen cross (~80 problems in the Albrecht). I'm a bit too lazy now :-) (At the moment the [electronic] annual general meeting of the Hamburg Sport Foundation runs, and surely goes another two boring^W highly fascinating hours, so maybe I multitask a bit :-)

Clearly, a lighter piece can only have 2 mates, if no batteries are allowed. Thus I did also B and the same time (2 solutions :-)
(= 6+1 )

Anyone with a more economical version?
(= 5+4 )

Aw cmon, the following position I composed sleeping ;P
(= 3+2 )

(Read Only)pid=20551
(5) Posted by James Malcom (Rewan Demontay) [Wednesday, Mar 31, 2021 15:42]

For Hauke, here a lighter version in which the 10th unthematic mate is by a queen. ;)

Me After Hauke, #2
(= 8+8 )

(Read Only)pid=20881
(6) Posted by Hauke Reddmann [Wednesday, Mar 31, 2021 18:26]

With Nc3, +sPa6 instead of Pb4 you get another unthematic Q mate ;-)
(Read Only)pid=20883
(7) Posted by Hauke Reddmann [Wednesday, Jan 12, 2022 19:11]

(= 4+3 )

1.fxg8B! (What? It's a task :-) ~/Se6/Sf7 2.Bd5/Bxe6/Bxf7
*Three* mates by a promoted B.
(Read Only)pid=22153
(8) Posted by Hauke Reddmann [Friday, Feb 25, 2022 10:42]

Just for the record (I'm anally retentive when it comes to priority),
the Grandson of Edit of course has been done already (by Hultberg):
(Read Only)pid=22369
(9) Posted by Hauke Reddmann [Sunday, Apr 10, 2022 16:36]

All four mates by a promoted knight!

One pays with other blemishes, though:

(= 11+9 )

HR, #2, Augsburger Allgemeine 12.3.2002
(Read Only)pid=22953
(10) Posted by Hauke Reddmann [Sunday, Apr 10, 2022 20:57]

Another find, adding a Q promo to the above B-S-combo
(the combo itself, of course, is also already anticipated):

Michail Gorislawski, Schach 10/1971
(= 6+1 )

2# (a: Dia, b: b7->a6, c: b7->e2)
(Read Only)pid=22962

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MatPlus.Net Forum Twomovers Most mates by a promoted queen in a #2?