>>70
There are more available tiles, but you also need to be way more specific with your available tiles. Once you've got two sequences in two suits, you've then effectively got to fulfill six separate waits to complete your ryanpeikou, of which each wait has a maximum of 3 tiles remaining, so at most six groups of 3, or 18 tiles, and if all three of any of those groups are drawn by other players or in the dead wall, your ryanpeikou is impossible to complete.