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Does anyone play Ambra?

Prompted by another post, I looked up BridgewithDan’s summary of Garozzo’s Ambra system

Here are two extracts:

Snip 1:

1 - 1 = 4+ 5+ HCP     

-  1nt = 5/12 HCP with maximum 2     

- 2 = a) RELAY GF generally with 4+                 

           b) 6+ 9/11 HCP     

- 2= a) 5+ GF               

          b) 3/4 3/7 HCP     

- 2 = 3/4 8/10 HCP if with 4 then MAX and 4-3-3-3     

- 2 = 6+ GF     

- 2nt = 4+ GF+

 

INTERFERENCE IN 2nd POSITION

CASE A : Opponent doubles

1 - X - XX = 4+           

           - 1 = 8/10 BAL or BAL GI+

           - 1nt = 5+

           - 2 = 5+

           - 2 = 3/4 8/10 HCP

           - 2 = 3 3/7 HCP

           - 2 = 6+ GF+

           - 2nt = 4+ GF+

 

Snip 2:

1 - 1nt = 5/12 HCP

       - 2 = a) GF+ with 3+

                  b) 6+ 9/11 HCP

      - 2= a) 5+ 10+ HCP

                b) 6+ 8/10 HCP

      - 2 =a) 5+ GF+

                b) 3/4 3/7 HCP

                c) 6+ 9/11 HCP

      - 2 =3/4 8/10 HCP no SGL

      - 2nt = 4+ GF+

 

INTERFERENCE IN 2nd POSITION

CASE A : Opponent doubles

1 - X - XX = 10+ HCP bal forcing to at least 2nt

           - 1nt = 5+

           - 2 = 5+

           - 2 = 5+

           - 2 = 3/4 8/10 HCP

           - 2 = 3/4 3/7 HCP

           - 2nt = 4+ GF+

 

Can anybody explain why the 2M-1 and 2M responses should switch ranges after a Double? It just looks like a memory trap to me. Or is it simply a mistake in the write-up? 

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