1

Nick name

MUTOS 1
  probablility of using this opening :
8,4%
Conditions

5+card minor 12-15hp or >=26 zp and < 32zp
64xx in majors and < 12hp

       
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Responses   Rebid opener   Rebid partner  Rebid opener 
1

6+hcp with an unknown 4c major if < 13hp .
The 4c major is not a condition when > 13hp

1

4c

1NT F- relay1-8 s12 (2/)  min.,/, no stop in om
s34(2/)  min.,/, stop in om
s56 (2NT/3) max.,/, no stop in om
s78 (3/) max.,/, stop in om
2/3 P/C   
2 F- relay2-4 s12 min,/,
s34 max.,/
2 F 2NT/3 No 4c / 4c
pass/2 end    
2NT NF,10-11hp    
1NT
4c
2/3 P/C    
2 F- relay1-7 s1 : 2 min.,/, no stop in om
s23(2/2NT)  min.,/, stop in om
s45(3/) max.,/, no stop in om
s67(3/) max.,/, stop in om
pass/2 end    
2 F- relay2-4 s12 min,/,
s34 max.,/
2NT NF,10-11hp    
2/
5+c /, no 4c major pass  
2x ? stop in x? 2NT yes    
  2y/3x no    
2NT NF,10-11hp
3 ?strength s12 min/max    
2/
64xx in / natural  
2NT
5-5 minor 3/ chose
3 ?strength s12 min/max    
3/
6-5 minor pass  
3 ?strength s12 min/max    
          
1

6-9hp, 5c

1NT
4c   pass                
2 P/C
2 F, 3c,6c
2 NF,3+c
2 6c
2/ 5+c /, sn 2/ 5c / (and 5c)
2 6c
2/
64xx in / natural,NF  
2NT 5-5 minor natural,NF
3/ 6-5 minor natural,NF
 
1NT    6-9hp, 5c    pass            
2/ 5+c /, sn   2 5c (and 5c)  
2 6c
2 2+c    
3/4 64-  
2NT 5-5 minor natural,NF
3/ 6-5 minor natural,NF
 
2 P/C pass/2       3 long, weak  
2/
64xx in / natural,NF  
3/ 6-5 minor natural,NF
 
2/2    F, 5c / , 10+hp 2/2 2+c support, min 2 after 2 10-11hp, 4 5  
3 after 2 MF,54+ 3NT/4/   4 2x5 major
2NT NF,10-11  
3 nature of support and ? minor s12 2c and /  
s34 3c and /
3/3 invit  
2 after 2 sn, 4c, min.  
2NT sn / pass  
3 ? stop OM ? minor s12 no stop OM, /
s34 stop OM,/  
3/3NT 5-5 minor min/max    
3 5c, max, sn/
3OM sn/,4c OM,max
3/ 5c, max, sn/
4/ 3c/ support,max
2 NF, 54, 10-11hp natural,NF  
2NT NF, 10-11hp , no 4c major natural,NF
3// long weak natural,NF
3NT end  
  
When getting overcalled ....  
1-double-.. System On from 2 (P/C) onwards   after 1NT weak pass : negative
redouble : equivalent for 1 double : 10+hp
pass : negative ( 2x4c -) 2/ : trf / , 10+hp
1/ : 5c /, 0-9 hp after 1NT 15-17 pass: negative
1NT : trf , 6c, 0-9 hp double : 9+hp
1-1/-. pass : negative ( 4c OM) 2 : P/C
double : 10+hp after 2x pass
1NT : natural, (stop not required) 2 after 2 : both majors 2x4
2 : P/C 2/ : NF, 10-11
2NT : 10-11 with stop 2 na 2 : NF, 10-11
2/ : cue, ? stop double : 10+hp
after 1 1 : 5c 2NT : 10-11, stop in x
2 : MF, trf OM() cue: ? stop
2 : 5c , 10-11hp 3x : long weak
after 1 2 : 5c , 10-11hp  
2 : trf OM(), competitive or strong  
Overcall in 4th position :
1-pass-1 - 1- ... pass = 4c  
double : 3+c  
1-pass-1 - 2/ - ...

pass : 5c /
double : 5c / and max
2 : 4-3 or 3-3 major and 5c in om
survives pass or 2