Play a top honour, unblocking the ten if you wish. If no significant card appears on the first round take a finesse of the nine.
This works against any 3-2 break and QJxx onside or Q or J singleton offside.
John Holland sent me this one from the Teltscher trials.
Alan Mould gives the following percentages
Two finesses 76%
Run ten and then if it loses cash AK 83.9%
line above 87.6%