
Hmmm...
No Tanyao, 3 Toitsu and 2 kanchan, 2 similar shapes.
Now WWYD and WHY?

Who is G Uzaku?
Mahjong books author. And he is also works for other Mahjong tactics books as Proofreading.
He prefer play real mahjong rather than internet Mahjong games.
『麻雀 傑作「何切る」300 選』
300 Selected WWYD (Blue)

『麻雀定石「何切る」301選』
Mahjong established tactic 301 selected WWYD (RED)

New One!!!
『ウザク式麻雀学習 牌効率』
Uzaku Style MJ Studies "Tile Efficiency"
(GREEN)
Picked Tile efficiency related subjects from Blue and Red version and adding more.
Highly recommended for players who just started and not winning hands often.
G Uzaku also running his blog
(Slashing MJ Books! Slashing MJ games!)
Twitter: @mjbook
The rule of thumb from Daina Chiba’s book says 3 pairs = break a pair. To decide which pair to break, you look at how good the broken pair is for your hand.
Discard 8p - good cards to draw are 679p. 69p gives a closed wait, 7p gives an open wait
Discard 4s - good cards to draw are 135s. 1s gives a closed wait, 3s completes the straight, 5s gives an open wait
Discard 6m - good cards to draw are 357m. 37m gives an open wait, 5m completes the straight.
46m is easiest to upgrade into a good thing so 6m is the best discard.
I think so, at least!
i pick 6m without thinking time... wanna see other choices with reasons 🤔 (especially if red 5s are on)
I also like 6m. It's easier to upgrade compared to 224.
Pure efficiency:
2S, in all situations, the edge tiles (1-9, 2-8) are having significant disadvantage over the middle tiles (3-7) as their improvement tiles are numbered significantly less than their middle counterpart. Here, the 446M can be improved with [2M, 3M, 4M, 5M, 7M, 8M] (24 total) while 224S can be improved with [1S, 2S, 3S, 5S, 6S] (20 total), and which is better now better seen.