all's fair in love and war

All's fair in love and war (something that you say which means behaviour that is unpleasant or not fair is acceptable during an argument or competition) — все средства хороши

Example: We weren't cheating, we were just playing to win. Anyway, all's fair in love and war.

[the end justifies the means]
[no holds barred]

[stop at nothing]
[go to great lengths]
[по головам]

[for love or money]
[by hook or by crook]
[by fair means or foul ]