BTU Jacoby transfers are characterized by subsequent forcing relays. Thanks to
moving spade invitation to Stayman, we enjoy one more step to separate slam try
from choice of games.
Opener super-accepts with maximum 4-card support. To help game try, opener
tries to show (4333) or a good side suit.
Responder rebids forcing 2♠ for a 5=♥ invitation. This forcing bid allows
invitation by distribution, e.g. 5=♥ 5+♦ ♣ .
1NT-2♦ 5+♥
2♥ (R) 2♠ ! MAX , 4=♠ , 4=♥ 2NT MAX , 34333♣ ! MAX , good 4+♣ , 4=♥ 3♦ ! MAX , good 4+♦ , 4=♥ 3♥ MAX , 4=♥ , none of the above
1NT-2♦ 2♥ - -
2♠ ! F INV , 5=♥ 2NT! UNBAL FG 3♣ ! S/T , 4+♣ 3♦ ! S/T , 4+♦ 3♥ INV , 6+♥ 3NT BAL P/C 3♠ !, 4♣ ♦ ! SPL , 0–1#, 6+♥ 4♥ Mild S/T , 6+♥ 4♠ ! F QUANT 4NT QUANT INV to 6NT5NT QUANT INV to 7NT
1NT-2♦ 2♥ -2♠ INV , 5=♥
2NT MIN , 15 HCP , 2=♥ 3♣ ! P/C , 16 HCP , 2=♥ 3♦ ! P/C , 16 HCP , 2=♥ , 5+♣ 3♥ MIN , 3=♥ 3NT S/O , 17 HCP , 2=♥
With 5=♠ invitation moved to Stayman, 5=♠ hands here are either weak or game
forcing.
1NT-2♥ 5+♠
2♠ (R) 2NT! MAX , 43333♣ ! MAX , good 4+♣ , 4=♠ 3♦ ! MAX , good 4+♦ , 4=♠ 3♥ ! MAX , 4=♥ , 4=♠ 3♠ MAX , 4=♠ , none of the above
1NT-2♥ 2♠ - -
2NT! UNBAL FG 3♣ ! S/T , 4+♣ 3♦ ! S/T , 4+♦ 3♥ ! S/T , 5+♥ 3♠ INV , 6+♠ 3NT BAL P/C 4♣ ♦ ♥ ! SPL , 0–1#, 6+♠ 4♠ Mild S/T , 6+♠ 4NT QUANT INV to 6NT5NT QUANT INV to 7NT