Theme B

Black opens a white line so that another white line can be closed on the mating move. Known also as Somov B1 theme.

Wróbel, Marian
Nepszava, 1934
1st Prize
FIDE Album 1914-44/I

mate in 2 moves

FEN: b2R3B/5N1K/p1B4b/p1P2R1p/Prk4r/Q1N1pp2/n2n4/5q2

Theme A2

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

Theme A

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

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

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

Feldmann 1 theme

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 Feldmann 1 theme

Cyclic mates ( or continuations) after random and correction moves of three black units in a single phase.

white Feldmann 1 theme

Reciprocal refutations after random and correction moves of two white pieces.

cyclic white Feldmann 1 theme

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

Stocchi combination

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

Cristoffanini theme

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

Zhuravlev theme

The double threat from the try becomes the key and the mate in a variation of the solution.

Scheme:
1.X? ~ AB
1.A a 2.B

Permyakov, Evgeny
Konkurs moskiewski, 2014
2 nagroda

mat w 2 pos.

FEN: 1n3B2/1Q3p2/4k3/2p3P1/1nK3N1/5NP1/3b4/3R1B2

caprice theme

A try is refuted by a defence that causes a certain effect (for example unpinning). The key creates the same effect with a new threat. A threat from the try reappears in a variation.

Postnikov, Aleksandr
64, 1991
1st Prize
FIDE Album 1989-91

mate in 2 moves

FEN: 8/2p1Q3/5p1b/4nP2/2bp4/2n1kPP1/2R2N1N/4B2K