Below I present the original problems from the Polski Związek Szachowy 2021 Tourney, which due to technical reasons could not be posted on the PZSzach website.
Tertiary Threat Correction
Tertiary Threat Correction
Three keys A, B, C are such as C corrects the threat of A, C corrects the threat of B and B corrects the threat of A.
Kovacevic, Marjan
Sunningdale Internet Tourney, 2010
1st-2nd Prize
FIDE Album 2010-12
mate in 2 moves
FEN: 4K1R1/2Q5/2N5/2BBNp2/1n3k2/R4P1n/7b/4r2b
Banaszek Marcin – Polski Związek Szachowy – 2017 – twomovers 2
Tura Waldemar – Polski Związek Szachowy – 2019 – selfmates 3
Threat correction
Threat correction
A move of the white thematic piece introduces the initial threat, but also introduces a general error which Black can use to defeat.
No other move by white thematic piece can prevent that defence by providing a mate in reply to it.
So instead of correcting the general error it corrects the actual threat.
For the sake of completeness, the initial threat should recur after some other defence.
Szwedowski, Leopold
Wola Gułowska, 1989
3rd Prize
mate in 2 moves
FEN: 5B2/2p2P2/2p5/1p2k3/1P2p2K/2pbp2N/Q1N5/3R1R2
Jasik Andrzej – Polski Związek Szachowy – 2019 – studies 2
Feldmann 2 theme
Feldmann 2 theme
Changed mates after a random and corrective move of the same piece in two phases. The correction doesn’t have to be the same move.
cyclic Feldmann 2 theme
Mates are transferred cyclically in three phases against black correction, but the correction move changes from one phase to another.
Szwedowski, Leopold
Hlas ludu, 1969
1st Prize
mate in 2 moves
FEN: 8/1p3p2/bP1K1P2/2p2Q1p/2kn3R/2N5/Pn1P4/bR6
Drążkowski Krzysztof – Csak-Majoros-Pasztor – 2019 – helpmates
Proof game
proof game
A type of problem in which the task of the solver is to construct a game with a given number of moves in which the final position is the one given by the composer.
A kind of retrograde analysis.
Grudziński, Henryk
The Problemist, 2013-14
2nd Prize
proof game in 23,5 moves
FEN: r1b2bnr/1pp3p1/n4kp1/6q1/2R2Bp1/1PPPKN2/2P2PP1/1N1Q1B1R