nullve, on 2018-February-01, 03:46, said:
This may be my last chance to give partner a club ruff, but I think a better plan is to induce declarer, who expects the trump king to be offside anyway, to play trumps from the top. (We would then also get our trick back if the ♣9 is a singleton.) Then a spade return might be sufficient, but it could also look like an attempt to establish a spade trick. A diamond return, on the other hand, will certainly look like a singleton. It's also very unlikely to cost a trick even if partner has the ♠KQ. (Declarer would need to have something really ugly like ♠xxx ♥AQTxx ♦Kx ♣Kxx.)
And happy birthday!
If we want declarer to play trumps from the top, then why not duck the first trick? Declarer will place us with the AQJ
♣, based on the opening lead and will not expect us to hold K
♥ as well. He might prefer to play trumps from hand, rather than trying to cross to dummy and risk a ruff.