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MatPlus.Net Forum General Changed promotion depending on a Black piece's play
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(1) Posted by Rewan Demontay (Real Name: James Malcom) [Friday, Jul 10, 2020 03:27]; edited by Rewan Demontay (Real Name: James Malcom) [20-07-10]

Changed promotion depending on a Black piece's play

I recently had an idea for pawn promotion-it changes play based on where a Black piece goes.

I managed to whip up a correct version of my idea after some trying. It has quite a subtle key as well.

Mate In 5

(= 9+9 )

The point is that 1... Nh6 leads to a White rook promotion, and that Nf5/e6 leads to a White bishop promotion.

Does anyone know of any more examples like this in directmates, in which a Black piece's movements result in changed promotions? To be specific, the Black king is excluded for obvious reasons, and I am interested in ones that involve pins like mine. Interesting examples without pins are also welcome since they are sure to be far more common.

Note-I do have another mate in 5 with the idea that doesn't have a promoted piece, but I find the dual after Ne7 far more distasteful and the key is far too obvious.

(= 7+10 )

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(2) Posted by Hauke Reddmann [Friday, Jul 10, 2020 13:09]

Well, x8Q/x8S is easy to do even in 2# and several
variants, so R and B are the really interesting parts
(and require #3 at least). I dimly remember some
stuff by Bo Lindgren?! (I.e., Rewan, it might be
enlightening to search "Allumwandlung" on PDB, although
much filtering is needed.)

Also, any Babson fits the bill :-)

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(3) Posted by Rewan Demontay (Real Name: James Malcom) [Saturday, Jul 11, 2020 01:46]

Hauke, Babsons don't count since White's promotion choices are determined by a pawn, not a piece.

And underpromotions are indeed the most interesting combinations. Here's a B and N one that I managed to cobble together.

Mate In 4
(= 9+11 )

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(4) Posted by Andrew Buchanan [Saturday, Jul 11, 2020 04:13]

This is a good task: fresh design space and a bit easier than Babson
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(5) Posted by Hauke Reddmann [Saturday, Jul 11, 2020 11:22]

Rewan, great idea! But any Indian is sad when you deprive
him of his critical move :-)

Here is a version of your idea that at least works with
a critical move as key (I needed a whole hour - since it isn't 2# :-)

(= 10+11 )

1.Rh7! etc.

The execution still lacks severely, and I don't even mean
the 3 bR. I strongly encourage you to try out several
matrices (S or B of Black, the king doesn't actually have
to protect it, the mate when Black pushed his tempo
prematurely, etc.)
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(6) Posted by shankar ram [Saturday, Jul 11, 2020 12:07]; edited by shankar ram [20-07-11]

There is a famous #5 by W.J.Wood, showing similar play(unpins and battery mates), but with a full pickaninny and white AUW!
No. P1064925 in the PDB Database:

Walter John Wood
Morning Post 1916
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(7) Posted by Frank Richter [Sunday, Jul 12, 2020 16:56]

Fritz af Geyerstam
5144 Deutsche Schachzeitung , p. 293, 09/1882

(= 12+10 )

(12+10) C+

1. Te8! droht 2. Lxc3+ Kf7 3. g8=D#
1. ... c2+ 2. Kc1 bxa5 3. g8=T Kf7 4. Tf5#
2. ... bxc5 3. g8=L Kg5 4. Ld8#
1. ... Lc2+ 2. Ke1 bxa5 3. g8=D ... 4. Te6#
1. ... bxa5 2. g8=S+ Kf7 3. Te7+ Kxg8 4. Tc8#

First AUW in direct mate, almost 140 years old (!).
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(8) Posted by Joost de Heer [Sunday, Jul 12, 2020 22:09]

(= 10+4 )

M. Niemeijer
Zadachi i etyudy 11/1928
1. e7
1... b6 2. e8=Q
1... b5 2. e8=S Ke5 3. Bg3#
1... bc6 2. e8=R Kd7 3. Rd8#
1... ba6 2. e8=B Ke5 3. Bg3#

AUW after a Pickaninny.
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(9) Posted by seetharaman kalyan [Sunday, Jul 12, 2020 22:25]

I did four different promotion by same pawn (Q/S doubled) after black selfpins. This was for wcct3. Will post later
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MatPlus.Net Forum General Changed promotion depending on a Black piece's play