If West keeps a heart, the A will drop his remaining diamond and East is finessed on the way back. Clash Squeezes A clash squeeze is similar to a guard squeeze in that it relies on stopper dependence between the opponents. One player must retain a particular card to prevent the promotion of a lower card that would normally just follow suit to declarer's winner. As with the guard squeeze, the clash squeeze has no practical application except when a pure squeeze would fail. The ambiguous threats are divided, but only South's threat is accompanied by an entry in its own suit.
North holds a non-winner in South's threat suit that is higher than East's stopper.
Further, South must have an additional entry in either of North's threat suits. On the A West discards a diamond. If West instead discards a second diamond, North's jack is high and South has a reentry to enjoy it. On the K West discards a diamond. If West instead discards a second diamond, North's nine can win a trick separately.