Boros theme
White (indirectly) pins the black piece on a mating move.
Milewski, Stefan
JT V.Kozhakin-50, Kudesnik, 2007
5th Prize
helpmate in 2 moves
2 solutions
Murdzia Piotr; Minski Martin – Curierul Problemistic 2018-2020 – studies
zugzwang
Jasik Andrzej – Polski Związek Szachowy – 2017 – studies
Kiss theme
Kiss theme
Cyclic shift of the keys and mates in 2 or more variations.
Scheme:
1.A 1…a 2.B, 1…b 2.C
1.B 1…a 2.C, 1…b 2.A
complete Kiss theme
Cyclic changes between key and 2 mates in 3 phases.
Scheme:
1.A 1…a 2.B, 1…b 2.C
1.B 1…a 2.C, 1…b 2.A
1.C 1…a 2.A, 1…b 2.B
Caillaud, Michel
1st TT Pat a Mat, 1992-94
1st Prize
FIDE Album 1992-94
mate in 2 moves
Iwanow Eugeniusz – V.Zheltonozhko-75 Memorial – 2017 – selfmates
focal points
Tura Waldemar – A.Selivanov-50 JT – 2017 – selfmates
Keller paradox
Keller paradox
White moves to a square on which an additional guard has just been placed by Black.
Keller paradox 2
Two squares are guarded by at least two black units. Black removes a guard from one guard and White immediately plays to the other.
Iwanow, Eugeniusz; Kapica, Ryszard
J.Knöppel Memorial, Springaren, 1998-99
3rd Prize
FIDE Album 1998-2000
selfmate in 3 moves