When partner leads A we play standard when dummy has xx, xxx or xxxx. Else we play UDCA. If Dummy has x we play suit-preference. After trick 1 we play UDCA. We do not lead K from AK. K lead denies A and shows Q.
And what do you lead back from Q852?
And what do you play from Q852 when partner get on lead and continues the suit with an honor? And with a small one?
And what if you have Q102 what do you play when partner on lead continues with ...