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MatPlus.Net Forum Endgame studies My first published study

### My first published study

I like records in chess problems, and economy, so I especially like length/economy records in tasks.

One way to make a long problem is to make one player use a tempo-manoeuvre many times. One way is for White to use a tempo-losing manoeuvre (beginning and ending with White moves) to put Black in zugzwang. But it's nicer for White to use one to win tempi for White's own moves. Such problems seemed scarcer.

Someone else who has researched the limits of length and economy in chess is Kirill Kryukov, who, for various material balances of up to 6 units, has found the "longest mate". By "longest mate" he means that winning position for which the winning-process is longest. His web page http://kirill-kryukov.com/chess/longest-checkmates/longest-checkmates.shtml contains the positions, but no mating lines.

Somewhere on the web, I found a file of an example mating line for each relevant material balance. I didn't expect this to make exciting reading, but two lines stood out for me. Each of them shows a repeated manoeuvre. A tempo-winning manoeuvre. One is in . Árpád Rusz exploited this in a study which he has published in several versions, one of which is study 93 on his blog, here: https://ruszchessstudies.blogspot.com/2017/10/study-93a.html Study 93's first two plies are captures, reaching the following position:

Árpád Rusz
Blog, 23 Oct 2017, study 93 (v); Marwitz 100 MT, Special prize (v)
(= 3+4 )

Win

The other material balance whose longest mating line shows a repeated tempo-winning manoeuvre is . It seemed that nobody had used this manoeuvre in a study. So I added a to lengthen the problem, and:

Rosalie Fay
The Problemist, Nov 2021, E1319
(= 3+3 )

Win

This was published in The Problemist's Studies section. Yochanan Afek, who maintains that section, gave me lots of advice on where best to end the analysis, and on one line he felt was lacking. I found upon seeing my study in print that he had also added a lot more analysis.

Congratulations! Records are always fantastic to compose.

Of course I want to see a "why" post here eventually ;-)
Why can neither White nor Black deviate from the main line?

To get specific move-by-move details you can use an endgame tablebase. Some notes on (longer-term) strategy:

If captures , the position is drawn even if White captures . So White needs to advance . is tied to the file, to defend it. To prevent Black capturing it, White needs to bring into play. White must deal with attacks by and with Black's threat of Kb4, so White must force Black to keep returning to b4. White achieves this by a manoeuvre which gains a tempo. White uses these tempi to move and then advance . must go a long way around in order to avoid checks and to capture to stop it promoting.

Congratulations, Rosie! I too need more help to understand the critical lines here, please?
And how do you get those figurine characters in the text, please?

Figurines: two open brackets = then the Forsyth character then two close brackets. Exception: white knight is S and black knight is s. For example if you use brackets instead of parens in ((=R)) then it becomes .

More detailed instructions on diagrams and figurines, including fairy versions, are here:
http://matplus.net/start.php?px=1645196212&app=forum&act=posts&fid=gen&tid=2

Thanks so much, Rosie & Shankar!