A line-moving piece makes a critical move across the square where another piece of the same or opposite colour intercepts it. The active power of intercepted piece is suppressed permanently, unlike the temporary suppression in Indian or Maslar themes. The critical piece is neither captured nor moved again and has no function in the final position; the mate would remain valid if the critical piece were removed from the board. The critical move is typically a hideaway or tempo move.
See also: Critical move; Indian; Maslar theme.
Morgner, Willy
Schachkongress Teplitz-Schönau im Oktober 1922, 1923
1.Re5
Ba8
2.Be6
Sb7+
3.Kd5
Se7#
Kluxen, Wilhelm
Kniests Schachbriefe, 1943
1.Rh4
Ra8
2.Sg4
Sa7
3.Kxa3
Sxc4#
Stapff, Hermann
Schach, 1951
1st Prize
1.Ra7
Bd4
2.Sb7
Ke5
3.Rg3
Kf6
4.Bg4
Kxf7#
Ott, Markus Johannes
Schach-Aktiv, 1993
1st Prize
1.Ra4
Sf5
2.Ke2
b4
3.Rf1
Sd4#
1.Ba4
Sf2
2.Ke3
b3
3.Sf3
Sd1#
Kirtley, Mark
The Problemist, 1988
1st HM
1.Bh7
Bd8
2.Rg6
Re2#
1.Rh6
Rf2
2.Bg6
Bc7#
Tataris, Antonis
Moutecidis, Pavlos N.
H. Colonelli-85 JT, 1982
1st Prize
1.Qa4
Rxc7
2.Rc4
Bxf6#
1.Rf5
Bxf6
2.Qe5
Rxc7#