Again, not sure, sorry bit dumb when it comes to maths. Shouldn't it be
{card_1 - card_2} which is for example 10h minus 7c gives a gap of 3
{card_1 - card_2} > 2
The following combinations would be ok for me, 2,5 2,6 3,6 2,j etc gaps are 3 or more
These would not be ok 2,4 3,5 gaps are 2 only