[kgr]

You need 4 Tricks

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Small to J and small to K compared to small to 9:
1) Small to 9 better if:
xx-ATxx    9,69
Ax-Txxx    6,46
Axxx-Tx    6,46
              22,61
2) Small to J better if:
Tx-Axxx    6,46
Txx-Axx   10,66
ATx-xxx    7,11
              24,23
=> small to J....but suitplay says small to 9
...what am I missing?

[suokko]

Tx-Axxx 6,46 To J and back loses this one. T will cover the 9 so unless you hold 8 ou will lose to the spot later

[MFA]

Yep.

Small to the J wins with 3-3: 36%
Small to 9 wins with 3-3 or 4-2/2-4 as long as T is onside: ½*(36+48)%=42%.

[kgr]

Thanks!