A piece plays across a critical square so that it is not interfered by another piece occupying this square.
See also: Critical move; Brasil theme.
Abdurahmanović, Fadil
Magyar Sakkélet, 1979
1.Ba7
Bxh6
2.Rd4
Se3#
1.Rd1
Rxh6
2.Bd4
Sd6#
Bakcsi, György
Die Schwalbe, 1967
1st Prize
1.h2
Rg1
2.h1=Q
Rf5
3.Qh8
Rgg5
4.Qxe5
Rxe5#
Krizhanivsky, Vasil
Chorno-bili stezhyny, Y. Smushkevich-110 MT, 2012 (v)
2nd Prize
1.Ke4
d5
2.Sxd5
Bc3
3.Sdf4
Re5#
1.Re3
f6
2.Sxf6
Rh5
3.Sfe4
Be5#
FEN: 7B/8/1p6/1R3P1n/1bpP1kq1/1pnr1p2/1K2p3/8