Four corners

A piece visits all four corners in a single or in more phases.

Abdurahmanović, Fadil

Mat (Belgrade), 1978

1st-2nd Prize

Example: Four corners
h#4 4.1... (2+12)

1.Kd4 fxe6 2.Kc3 exd7 3.Kb2 dxc8=Q 4.Ka1 Qc1#
1.Kf4 f6 2.Kg3 f7 3.Kh2 fxe8=Q 4.Kh1 Qxh5#
1.Kd5 fxe6 2.Kc6 e7 3.Kb7 exd8=Q 4.Ka8 Qxc8#
1.Kf6 Kg2 2.Kg7 f6+ 3.Kh8 f7 4.Rh7 f8=Q#

Four corners of bK.

View in Helpmate Analyzer

FEN: 2bqn3/p2p4/3pp3/4kPpr/8/8/r4p2/5K2

External links:

Abdurahmanović, Fadil

Mihajloski, Zlatko

The Problemist, 2015

1st Prize

Example: Four corners
h#5 2.1... (3+7)

1.Kf4 Rh1 2.Ke3 Ra1 3.Kd2 Ra2 4.Kc1 Kb5 5.Qd2 Ra1#
1.Qd7 Rh8 2.Kf6 Ra8 3.Ke7 Ra7 4.Kd8 Ka6 5.Kc8 Ra8#

Four corners of wR.

View in Helpmate Analyzer

FEN: 8/2r5/3q3R/K5k1/p7/P7/1np2b2/8

External links:

Hegermann, Bruno

The Fairy Chess Review, 1939

Example: Four corners
h#4  (3+7)
b) bRh6→h2 c) bRh6→b1 d) bRh6→c8

a) 1.Kf6 Kg3 2.Kg7 f6+ 3.Kh8 f7 4.Rh7 f8=Q#
b) 1.Kf4 f6 2.Kf3 f7 3.Kg2 f8=Q 4.Kh1 Qf1#
c) 1.Kd4 f6 2.Kc3 f7 3.Kb2 f8=Q 4.Ka1 Qa3#
d) 1.Kd6 f6 2.Kc6 f7 3.Kb7 f8=Q 4.Ka8 Qxc8#

Four corners of bK.

View in Helpmate Analyzer

FEN: 8/p1p5/7r/3pkP1p/4p2K/7P/8/8

External links: