Here was the original problem:
Deal three — 3NT South
Solution–
In this no-trump contract partner might have under lead the A♥️. We cannot afford to give South a cheap trick with her/his Q♥️. We should play K♥️ on the first trick, i.e.”third hand high.” This might be the ♥️ situation:
After winning the K♥️ we continue with the J♥️ and trap South’s Q♥️!
