The reason to open 1CL 5/5 in a black suit is to be at level 2 if your p is weak

The hand is not strong enough to play at level of 3

 

Example

 

AJ876

QX

X

KQ10XX

 

I will always open 1CL with this hand .

lets say bidding go

1CL               1D

1SP                1NT

2SP>>>>>>>>>>>>>>>>>>show 5/5 or 6/5 not strong.

 

AQJ10X

X

KX

KQ10XX

 

With this hand i will open 1SP follow by 3CL

 

 

 

Thank you Hamada

Appreciate your  taking the time to answer.   The  question came up again  and I was not sure how  to explain and  it is easier  when it is here with example  

im a little confused:

5/5 you open weaker hand 1 club?

5/5 you open stronger hand 1 spade?

please explain?

my own style would be to open both these hands 1 spade......my lessons have always been geared toward finding a major fit can bid the clubs 2nd time around 2= weak hand....jump to 3 =stronger hand.........neither hand fits criteria for a reverse..........

This is one of my favorite special treatments © ( 5-5 vs 5-6 in the Blacks) and I reserve using 1C open for the minimum or sub-minimum opening with 5-5 ( even  a sub-minimum 5-6).

After a 1C open if partner has a game force hand,  he will most ALWAYS use the 4th suit game force (4SGF) rebid to show this.    Then your rebid of 2S ( similar to Hamada) would show the min or sub-min 5-5 opener( even a sub-min 5-6), whereas a JUMP to 3S would show a FULL 5-6 opener ( ie a hand worthy of a reverse ).