Dealer: South Both vulnerable NORTH Ƅ8762 ƆAKQ ƇKJ97 ƅJ6 WEST ƄJ104 Ɔ1075 Ƈ1065 ƅA542 S
1Ƈ Pass 1Ƅ Pass 1NT Pass 3NT All Pass Opening Lead: ƄJ
South ducked the spade lead but, perforce, won the continuation and unblocked the hearts. He ran the diamonds and cashed the jack of hearts to bring home nine tricks and the game bonus, N-S +600. West had found the most effective lead on this deal. If he selects the deuce of clubs as an opening lead, partner should cover dummy's six with the eight but an overtrick will be in the bank. East can be sure that
WEAST Ƅ.4 Ɔ Ƈ83 ƅQ983 SOUTH ƄA9 ƆJ862 ƇAQ42 ƅK107 N E declarer owns a top club. It will be correct to insert the eight in case South owns the king and the ten. Declarer would be assured of two club tricks anyway when he holds ace-ten third.
If East mistakenly puts up the queen, then South will score two club winners and emerge with eleven tricks.
A heart lead is safe but accomplishes nothing where South will record ten tricks by playing a club to the ten. The spade shift would then come too late.
This auction would be duplicated at a majority of tables where the opening lead would be the determining factor in the number of tricks won by declarer. The selection of the jack of spades guaranteed E-W an equitable matchpoint award.