hcp(west)+hcp(east)<20
and
(
   ( clubs(north)+clubs(south)<6
    and
     ( shape(north, xxx1, xxx0) or shape(south, xxx1, xxx0)  )
   )
  or
   ( diamonds(north)+diamonds(south)<6
    and
     ( shape(north, xx1x, xx0x) or shape(south, xx1x, xx0x)  )
   )
  or
   ( hearts(north)+hearts(south)<6
    and
     ( shape(north, x1xx, x0xx) or shape(south, x1xx, x0xx)  )
   )
  or
   ( spades(north)+spades(south)<6
    and
     ( shape(north, 1xxx, 0xxx) or shape(south, 1xxx, 0xxx)  )
   )
) and ! shape(north, any 11xx, any 01xx, any 00xx, any 12xx, any 02xx)
  and ! shape(south, any 11xx, any 01xx, any 00xx, any 12xx, any 02xx)