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Topic review
I'll only go through obvious mistakes
east 1
first discard - you should keep the

shape because it's a double kanchan, and

is a good tanyao tile but I know you went for sanshoku. I feel looking at it now the most balanced discard will actually be

to go for both tanyao and sanshoku but a difficult one. To avoid confusion and simplicity I recommend either

or

(not aim for sanshoku but go for tile efficiency) but my choice personally is

.
fourth discard- you threw

but you still don't have a jyantou or a pair, you should keep the

shape because it is a good shape to create a pair with either

,

tsumo creating a pair and a mentsu
EDIT - best discard i forgot to say is to discard the
kamicha-
discard, you must chi this

, you get a guaranteed sanshoku in your hand.
6th disard - again you still don't have a pair or a jyantou

is a very good shape to create a pair with either of

creating a pair and a mentsu and therefore you should keep that shape rather than going for jyunchan full out. I would reccommend going for

or

( probably

because there's already one in the discards) rather than

.
east 2
first discard - another possible sanshoku hand but the

is way too quick. you should discard either of the jihai for tile efficiency
not much to say other than that, good riichi
east 3
second discard - again too early to discard the

, this is just a normal yakuhai hand and so leaving the 5m for a possibility of a double sided wait is much better than keeping the
third discard - you should not discard

, try to go for the quickest tenpai and not a yaku like chanta in this case.
12th discard after riichi -

although it is onechance,

is a better choice becasue it is a genbutsu tile, then you should throw

or

because of the

and

suji, only then when you run out of safe suji tiles, you can throw

. one chance tiles are only slightly safer than musuji tiles.
14th discard - straight after the toimen riichi, you have to throw

,

is actually dangerous to both riichi while

is genbutsu to both
15th discard-

(enough said)
east 3-1
first discard - I can't figure why you threw the

but it should be
I don't know if you are already bailing or not so i can't really comment on further discards,
east 4
You are tenpai- you must push

, if you win this hand you are first. You don't need to riichi becasue there is a riichi stick already on the table, you have a yaku and you hand is worth 2000 points. so if you win you will go abaove 30000 points and you'll end there as first. You get no minus points for last as 3級 as well meaning more of a reason to push. if you are a higher dan, it gets more difficult but my general opinion is you should initially push the

but bail if you draw another dangerous tile.