Changed blocks

Different self-blocks on the same square in two or more phases.

See also: Stocchi blocks; Blocking piece replacement.

Alias: Blockwechsel (Ger.); Pseudo Stocchi blocks.

Bakcsi, György

Sahs/Shakhmaty (Riga), 1961

2nd Prize

Example: Changed blocks
h#2 3.1... (7+11)

1.Sxe2 Rxg7 2.dxe5 Rf7#
1.Sh5 Rg6 2.Bxe5 Bc2#
1.Se4 Rg4 2.Sxe5 Rf4#

View in Helpmate Analyzer

FEN: 8/3p2pK/2np3p/4Pk2/7P/1B3Pn1/4N1R1/b4qrr

External links:

Sonnenfeld, Felix Alexander

Schach-Echo, 1976

Example: Changed blocks
h#2 4.1... (8+13)

1.Rxg3 Rb1 2.Rxg5 Rf1#
1.Bxd2 Bf1 2.Bxg5 Bh3#
1.h6 d3 2.hxg5 dxe4#
1.Se6 Sg6 2.Sxg5 Sh4#

View in Helpmate Analyzer

FEN: 4bnnN/3p2pp/1R3N2/b3pkPp/r1B1p3/r5P1/2KP4/8

External links:

Abdurahmanović, Fadil

Schach-Echo, 1980 (v)

4th HM

Example: Changed blocks
h#2 4.1... (5+13)

1.Se3 Sxf3+ 2.Qe5 Rd4#
1.Sd4 Sc4+ 2.R1e5 Se3#
1.Se7 Sd7+ 2.Be5 Sf6#
1.Sf6 Sxc6+ 2.R8e5 Se7#

View in Helpmate Analyzer

FEN: 4r1nb/p4K2/p1p3p1/3kN1Rb/6R1/B4p2/2n5/q3r3

External links:

Shorokhov, Boris

Azemmour TT-4, Belgrade, 2016

1st-3rd Prize

Example: Changed blocks
h#2 3.1... (9+12)

1.Rxb4 Bxg4 2.Rd4 Bf5#
1.Scxe2 Rc3 2.Sd4 Re3#
1.Bxc5 Sd5 2.Bd4 Sf6#

View in Helpmate Analyzer

FEN: 8/bpp2K2/4P3/1pR1P2R/1N2knp1/2n5/br1PBrP1/5q2

External links:

Kardos, Tivadar

Skakbladet, 1955

1st Prize

Example: Changed blocks
h#2 6.1... (4+14)

1.Rg1 Kxc5 2.Rxg4 Sg6#
1.Rg2 Kxd5 2.Rxg4 Sg6#
1.Qb4 Kc7 2.Qxg4 Sg6#
1.Be2 Kc6 2.Bxg4 Sg6#
1.f5 Ke5 2.fxg4 Sg6#
1.Sh6 Ke7 2.Sxg4 Sg6#

View in Helpmate Analyzer

FEN: 5Nn1/6n1/3K1p2/qbpp2pp/p5Pk/7p/3r3P/2r5

External links:

Hernitz, Zvonimir

Wola Gulowska, 1995

1st Prize

Example: Changed blocks
h#2 3.1... (10+11)

1.Sxf4 Kg1 2.Sd5 Sc5#
1.Rxd3 c3 2.Rd5 Sg5#
1.Qxf3 Kh2 2.Qd5 f5#

View in Helpmate Analyzer

FEN: 8/2p1pp2/2P1k3/1n2P3/1Pp2PP1/2rN1Nq1/2P1n1P1/1bb4K

External links: