Blog about chess problems
A square in the black Kings field is guarded by a white linemover and blocked by a black piece. A
threat closes the line of guard and Black in defence unblocks that square.
Kovacević, Marjan
Pat a Mat, 2008
1st Prize
FIDE Album 2007-09
mate in 2 moves
FEN: 4Q3/5pp1/3P1P2/pP1kP2N/RP1bN2R/2p1p2p/8/4KBBn
A square in the black Kings field is guarded by two white linemovers. A threat closes one of these lines and Black defends by closing another. Known also as Barulin defence.
Banaszek, Marcin
Jubileusz Polska-40, 1986
1st Prize
FIDE Album 1986-88
mate in 2 moves
FEN: 7B/K3N1qr/1p1P4/1P1B2R1/3k1pN1/bP1r2p1/2Qnn3/4R3
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
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
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.
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
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
Reciprocal mates (or continuations) after two random and correction move pairs in a single phase. Thematic pairs of variations may be made by two different units, or by a single line-mover along two different lines.
It is otherwise known as the reciprocal black correction theme.
Cyclic mates ( or continuations) after random and correction moves of three black units in a single phase.
Reciprocal refutations after random and correction moves of two white pieces.
Cyclic refutations after random and correction moves of three (or more) white pieces.
Szwedowski, Leopold
The Problemist, 1970-71
FIDE Album 1971-73
3rd Prize
mate in 2 moves
b) Ba8->a2
FEN: B2B2q1/b2p4/1p2n1R1/Npkp1N1Q/4n2R/P1p1p3/8/K6b
Changed play in three phases with transferred mates from first to second and simple change from second to third phase. It is a type of the distributed Rukhlis theme.
Szwedowski, Leopold
R. Kapica Memorial, Problemista, 2002-2003
FIDE Album 2001-2003
4th Prize
mate in 3 moves
FEN: 5R2/2P4K/4Q1pb/3PnP2/2Ppk1Bp/2Rp2PN/2p2Bnr/2q2N1b
Black pins indirectly a threatening white piece that mates by moving along the pin-line (Pelle move).
Iwanow, Eugeniusz; Rosolak, Władysław
Orbit, 2007
4th Commendation
selfmate in 2 moves
FEN: 4B3/4br1R/4Nk1p/q3n2P/rn4QK/3p2NP/1B6/8