Mutual interference
Two or more pieces interfere with each other on same or different square(s) either in parallel phases or consecutively.
Special types of mutual interference:
Garai, Toma
Springaren, 1982
h#2 2.1... (5+8)
1.Be3
Bh5
2.Rg6
Bf3#
1.Rf2
Bc3
2.Be4
Se3#