>Chapter 23
>Rebuild your hand so that you can have good shape after pon

>The first tenpai is not the final shape

(Some omitted paragraphs about yonma here.)
>Making calls that don't advance shanten to improve your shapes can be done both in yonma and sanma.
>1344499s777z pon 111z
>From this hand it's good to pon 4s or 9s to get a wider wait. 9s would be especially good as you would get a 3-sided wait.

>1223499s pon 555z
>The penkan* wait on 3s can be improved by calling pon on 2s and switching to a 25s wait, or by ponning 9s and then choosing a 25s or 14s wait.
TN: This is the first time I've seen penkan, but as you can see it's just a combination of penchan and kanchan.
>Calling pon with your head and then switching to a tanki wait that combines with another shape should become a habit.

>Pon from sequential shapes

>With sequential shapes you can get wider waits. Consider
>11m12456777s pon 666z
>Pon on 1m from here lets you cut 1s to improve to a 23s wait. And if you draw any of 568s, your wait will improve further.

>dora 7z
>11m55567889s777z
>An iron pon on 1m followed by an 8s cut leaves you with a 4-sided wait. Also notice that ponning 5s or 8s would give you ryanmen or better waits.

>11m13345678s555z
>Discard 1s after calling pon on 1m or 3s to get a 3-sided wait.

>dora 7s
>12355677s11p pon 555z
>Pon on 1p from this iipeikou-shaped hand will let you choose between two different ryanmen waits.
>It's an excellent hand with different options depending on the bakyou.

>11m33455678s pon 555z
>Calling pon with the 1m head here lets you choose between two different sanmenchans.
>With callable hands, always be aware of what calls you can make to improve your shape.