Stepping Stone of Thunder

This hand is from the recent European Open Championship pairs championship. The hand needs to be viewed as a 3NT hand by West (sorry about that but the table closed down while I was still analysing it.) The play potentially involves two spectacular plays:

1. Days of Thunder: coined by Eric Rodwell it involves switching to an opponents long suit to hamper communications
2. Stepping-Stone Squeze: first analysed by Terence Reese in his classic "The Expert Game" and involves overcoming a blockage by throwing in a n opponent

North opens diamonds and West has a pretty obvious duck after the A and J - fair play to south if this is from AKJ. Now we see play one. If South can imagine a club blockage then switching to a spade creates a blockage in that suit.

This is not the end of the story if West can put South with 4+ clubs with the AH. He runs six spades and has now played 8 tricks. South must come down to either 4 clubs and the AH or 3 clubs and AQ hearts. In the latter scenario the clubs will run but in the former West can unblock the clubs and exit in hearts - thus using South as a stepping stone to the clubs.

More Shortshake, LOL

Another play named by Eric Rodwell in the 'The Rodwell Files' and the example is from the books of Terence Reese.

West leads the Q♦. You play low to presere the K♦ as an entry (and in case East is void). East follows to the diamond but discards on the first round of trumps. You have 11 top tricks but the bad trump break means you will need to develop a trick in either spades or diamonds.