Guitar chords: G minor seventh
Gm7

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 1-11-1  3rd fret
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 |2||||
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 ||||4|
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 GDFBFG 
    b

or:

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 1-1111  3rd fret
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 |3||||
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 GDFBDG 
    b

or:

 XX
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 ||1|||  5th fret
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 ||||23
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 |||4||
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   GDFB
      b

or:

 X
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 ||1-1|  8th fret
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 |2|3|4
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  GBFGD
   b

Notes:  I  : G
       IIIb: Bb
        V  : D
       VIIb: F