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MatPlus.Net Forum General Black King in check

Black King in check

Do you know a #2 (actually a #1, so to say) with black king in check?
Obviously, White could have given that check in his first move,
so retroillegality or desastrous cook danger are the only reasons
I offhand can come up with for such measures...

I don't understand your "actually a #1, so to say". If the black king is in check and the stipulation is #2, wouldn't it be 4 half-moves? Cf. P0004182 and others...

Yes I agree with Jakob if Codex Article 15 is applied, then Black gets an extra defensive move. In Popeye this can be solved as “#3 postkeyplay”.

Another possibility I think you are familiar with Hauke is Lese Majeste. Here we say we have an illegal (indeed ill-formed) position in which WTM is already delivering check. However actually capturing the king is illegal in FIDE Laws (and would permanently prevent White from
checkmating!) So one can still play forwards and treat the problem as a regular #2. Here are two examples: https://pdb.dieschwalbe.de/search.jsp?expression=PROBID%20IN%20%27P1305338;%20P1305342%27 This is also supported by Popeye.

(4) Posted by Hauke Reddmann [Tuesday, Mar 19, 2024 09:09]

@Jakob&Andrew: I never read the Codex :-), but note that the problem
Jakob mentions has the solution written as "1. ... c6 2. b4 Ka3 3. Ta1#".
This numbering is also standard for set play, so I find it natural
to call this a "#3". Since evidently the community sees this otherwise,
I am pouting :-)...no, I note that this interpretation allows even
more interesting #2. Who is the first to show a starflight starflight? :-)

A problem with four plies (halfmoves) is a problem with two moves.

This topic reminds me of another way how to force the Black move first. (Actually not so different as check to bK implies white moved last.)
What about the following twomover with really false tries 1.Sb4?, 1.Sxg4?, 1.Qh7? and surprising solution. (Well, not so suprising with all the explanations.)

Particular First Prize Pravda 1992-1993
(= 15+6 )
#2

Published (click there 2682 for solution, if needed): https://rubriky.soks.sk/wp-content/plugins/rubriky/www/pravda/r1993/pr_2682.php
In the award (at the bottom): https://rubriky.soks.sk/wp-content/plugins/rubriky/www/pravda/r1994/pr_92_93.php#d

Why couldn't Black's last move have been h5xg4?

In position with bPh5 and a white piece on g4 - how do you explain the black pawns e4 and e5?

I'm going to have to find some less stupid friends.

@ Neal
😅😀😂