Blocking piece replacement

In the initial position, a black King's flight is blocked by the black piece A. In the final position, the same flight square is blocked by another black piece B.

Garai, Toma

Thema Danicum, 1976

Prize

Example: Blocking piece replacement
h#3 b) bBf8  (4+3)

a) 1.Qg1 Sg3 2.Rf1 Se4 3.Ra1 Sc3#
b) 1.Qh8 Sf2 2.Bg7 Sd3 3.Ba1 Sc1#

Blocking piece replacement bQ-bR & bQ-bB.

View in Helpmate Analyzer

FEN: 5r2/8/8/8/1B6/8/k1K1P3/q6N

External links:

Caillaud, Michel

Shakhmatna Misl, 1982

1st Prize

Example: Blocking piece replacement
h#5 3.1... (2+10)

1.Bd8 a5 2.Bb6 axb6 3.c1=B b7 4.Bg5 b8=S 5.Be7 Sd7#
1.Qb3 a5 2.Qb6 axb6 3.c1=Q b7 4.Qc4 b8=S 5.Qf7 Sd7#
1.Rb8 a5 2.Rb6 axb6 3.c1=R b7 4.Rc8 b8=S 5.Re8 Sd7#

View in Helpmate Analyzer

FEN: 4rkn1/4bqn1/p2p4/5p2/P7/8/2p4K/8

External links:

Loustau, Jean-Marc

Ideal-Mate Review, 1986

Prize

Example: Blocking piece replacement
h#7  (2+7)

1.Sc7 Kf1 2.Kd5 Kg2 3.Bd6 Kg3 4.c5 Kf4 5.Sc6+ Kxe3 6.e5 Kd3 7.Se6 e4#

View in Helpmate Analyzer

FEN: 8/8/2pkp3/2bnn3/8/4p3/4P3/4K3

External links:

Nastran, Janez

Slovenian Championship, 1993

1st Place

Example: Blocking piece replacement
h#2  (7+11)
b) wQb6→b8 c) wQb6→g3

a) 1.Qf2 Qxe6+ 2.Sxe6 Rxf2#
b) 1.Qd7 Qxe5+ 2.Rxe5 Bxd7#
c) 1.Qd5 Qxf4+ 2.Bxf4 Rxd5#

View in Helpmate Analyzer

FEN: 2B5/5p2/1Q2rp2/2R1bkpP/1r2pnp1/8/3q2P1/5R1K

External links:

Trillon, Jean-Michel

feenschach TT-25, 1972

2nd Prize

Example: Blocking piece replacement
h#5  (2+10)

1.Rg8+ Kd7 2.Rb7+ Kxc6 3.Rbg7+ Kb5 4.Rb8+ Ka4 5.Rb2 Sc3#

Blocking piece replacement bR-bR

View in Helpmate Analyzer

FEN: b3K2b/6r1/2p1p3/3p4/8/6p1/kr6/nN6

External links:

Moen, Kabe

The Problemist Supplement, 2019

Example: Blocking piece replacement
h#3 b) -wPf3  (4+6)

a) 1.Re5 Bh7 2.Sc5 Bd3 3.Sde6 Be4#
b) 1.Bd6 Rf1 2.Sc6 Rf7 3.Sed4 Rf5#

Blocking piece replacement bS-bS (x2).

View in Helpmate Analyzer

FEN: 6B1/8/4n3/3k4/2pnrb2/5P2/8/K2R4

External links:

Foldeak, Walter Arpad

Revista de Sah, 1963

5th HM

Example: Blocking piece replacement
h#5  (2+4)

1.h3 b8=R 2.h2 Rxb2 3.h1=R+ Rh2 4.Sb2 Rh3 5.Rb1 Ra3#

Blocking piece replacement bB-bS.

View in Helpmate Analyzer

FEN: 8/1P5K/8/8/7p/8/1b6/k2n4

External links: