3C = relay 3D = no 4 card M or both 4-4 M 3H = 4/5 card H, no 4 card S 3S = 4 card S 3NT = 5 card S After 2NT-3C-3D: 3H = Smolen (4H & 5+S) OR no 4 card M OR slam invitation in m 3S = relay 3NT = no 4 card M 4m = slam invitation m 4H = 5S-4H, slam invitation 4S = RKC H 4NT = RKC S 4S = 5S-4H, no slam invitation 3NT = to play 3S = Smolen (4S & 5+H) 3NT = to play opposite 5-4 4D = transfer H 3NT = 4 card M 4C = relay 4D/H = transfer After 2NT-3C-3H 3S = relay, asks for 5 card H 3NT = only 4 hearts 4C/D/H = shows shortage (from low to high) 3NT = to play
I'd like to know what you think about it, and if we would be able to improve it. Please don't start saying it's complicated, me and my partner don't mind that

Help

free, I will give you a hint of maybe something you might like
singlesuited slam interest
singlesuited slam interest
singleton and both minors slam