MAMIFUS

MAMIFUS es un acrónimo que abrevia cuatro palabras en Inglés: Major Minor Full Stayman. A continuación les obsequio el resumen que creó GranGurú (John Plaut) del sistema que jugamos para nuestras aperturas de 1NT 12-14 y que perfeccionamos entre ambos.

1NT is supposed to be 12-14 HCP but it may be adapted easily to any other range.

It allows any 4333, 4432, 5M332 5M4m22, 4M5m22, 4441 and 6m322. It does not permit hands with 9 cards in both majors. Those must be opened with the longest major.

Normal responses are 2♣ Stayman, 2♦ and 2♥ transfer to majors OR A 2-SUITED HAND (to be incorporated here later).

2♠ and 2NT are transfers to the minors. Intermediate suit super accepts the  minor, in order the strong hand play the dummy and receives the lead.

Responder bids of 3♥ and 3♠ are 3-suited hands usually 1=4=4=4 or 4=1=4=4 might be 0=4=(45m) or 4=0=(45m) short in the other major GF.

After 2♣ a new relay by responder of 3♣ is GF for the opener.

When 1NT opener has shown 2-suits, subsequent bids at the 4 level are RKCB-1430 for the lower, higher and both (6-KeyCards) respectively. If no space available for 3 RKC asks, RKCSG and Quantitative are discarded.

When there is a surplus of space 4NT is quantitative.

When opener has shown a 4441 hand, 4NT is RKCSG and the minor suit bids are intended for CAB (where responses by 1NT opener are 0-3,4,5,6) 1NT Opener can’t have more than 6 controls (AAKK or AAA).

A new CAB asking in the same suit is Queen’s asking 0,1,2,3, except when partner has shown 6 controls.

1. 1NT 2♣ ASKS MAJOR or INVITATIONAL with/without 4M

2. 2♦ denies 4M then 3♣ asks more explanation and 3♦ offers a 5-6 minor suit NF.

3. 2♠ with 4-5 spade cards then 3♣ is a distributional GF relay

4. 2♥ with 4♥ then 3♣ asks for second 4-card suit

5. 2N with 5♥ then 3♣ is a distributional relay

6. Permits to describe all 4441 hands when 1NT openings permits this shape (UPH = Un Passed Hand)

7. Direct inverted splinter with 1444 and 4144 (just when facing pard UnPassedHand), then 3♠ is CAB and 4♥ is CAB. When facing Passed Hand, 1NT opener has to bid his major suit.

1N            2♣  Stayman or Invitational

3♥ 1=4=4=4      

3♠ 4=1=4=4

8. Direct answer of 3♣ by 1NT opener, here 3♦ is relay for residue.

9. Only cases where we surpass 3NT is with 5♠4m, 4♠5♣ and 4♥5♣

10. You may make 3 Relay bids when 4♥-cards are found. 2 or 3 relays when 4♠-cards are found.

11. When 3♣ is first answer to Stayman 4♦ 4♥ 4♠ should be EKB:

1N            2♣ Stayman or Invitational

3♣ 6♣         4♣ RKCB(♣)
              4♦ EKB (Responses to EKB are 1-4,0-3,2,2+Q)
              4♥ EKB (Responses to EKB are 1-4,0-3,2,2+Q)
              4♠ EKB (Responses to EKB are 1-4,0-3,2,2+Q)

12. 4NT is RKCSG (Roman Key Card Super Gerber) if no suit has been agreed

13. When 1NT opener has shown 2-suits and 4NT is free then it is Quantitative. Example:

1N            2♣ Stayman or Invitational

2♥ 4♥         3♣ Ask more info

3♦ 4+♦        3♥ Ask shape

3♠ 2-4-5-2    4♣ RKCB(♦)
              4♦ RKCB(♥)
              4♠ RKCB(6-keycards)
              4NT QUANTITATIVE

14. If 1NT opener has shown 3-cards in a major 4M is to play:

1N            2♣ Stayman or Invitational

3♣            3♦ Ask more info

3♥            4♣ RKCB(♣)
              4♦ RKCB(♥)
              4♥ IS TO PLAY
              4♠ RKCB(6-keycards)
              4NT QUANTITATIVE