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%

AK 79.13%

Run ten and then if it loses cash AK 83.9%

The recommended line above 87.6%