Loser on loser

Loser on loser play is a type of declarer's play in contract bridge, usually in trump contracts, where the declarer discards a loser card (the one that is bound to be given up anyway) on an opponent's winner, instead of ruffing.

Loser on loser technique can be executed for the following goals:
 * 1) to maintain trump control of the hand,
 * 2) to transfer the ruff to a "safer" suit (e.g. in order to perform a later crossruff).
 * 3) as part of an avoidance play (e.g. the scissors coup)
 * 4) to rectify the count for a subsequent squeeze play.
 * 5) as part of an endplay.

Example
After the auction,