I will discard the
simply because it's the tile that has the most number of tiles to tenpai as well as the highest potential to get a good wait.
discarding
and therefore getting
means that when you pon the
you get a bad wait of either
pair wait or a
kanchan single wait. The main way this hand is going to win is by ponning the
and therefore you must ensure a good wait after the
pon and therefore
discard is not recommended
discarding
and getting
is not recommended as, although you get a good wait of
double sided wait after the
pon, when you draw the
yourself you are forced to riichi with a pair wait of either
or
which is not bad but just worse compared to
discard which I will explain.
with the
discard you get
, and whilst you still get the same benefits after
pon with the good double sided wait of
, when you draw the
yourself, you get the almighty
double sided wait you can riichi on. you may argue that there is a point differential with the pair wait including the
which may achieve the higher average score but in modern mahjong, it is generally considered better to wait on the hand with the highest probability of winning unless there is a significant expected score differential.
double sided wait is considered a much better wait than pair wait including
and if you consider the RED
, you can still achieve mangan with riichi tsumo dora +ura and therefore there actually isnt much of a score advantage in including the
as your wait. even without the RED
it is still considered better to riichi with a
double sided wait than a
pair wait. ( unless you are oya where double east pair wait becomes slightly better than riichi only double sided wait)
with the 1p draw
and
discard both end up with the same wait of
wait so
discard wins out on the difference in
self draw.
(I'm assuming you are south( I've never played this game so I don't know how the name tiles are placed))I will also point out that the
in
does not actually add to the number of tiles needed for tenpai, and as I have pointed out that double sided wait are generally considered better so even if you draw the
from
, It's generally considered better to riichi on a
double sided wait leaving
actually quite useless except for
chi (more exceptions= you are oya/ you are desperate not to riichi and therefore will wait on
when you draw the
without using riichi). Although leaving
chi can help, I think keeping the RED
instead of the
from the discard before is a bigger deal in trying to get a higher potential score out from the hand.