BA
Worth 4 points before any premium square, and the 34th highest-scoring of 96 — tied with 18 others.
BA extends into 13 three-letter words, which is the 30th most extendable of 96 — tied with 5 others. That is the number worth memorising: a two-letter word is a place to put tiles, but a well-hooked one is a place to put them where the board stays open.
Every hook
- A→ABA
- A→BAA
- D→BAD
- G→BAG
- H→BAH
- L→BAL
- M→BAM
- N→BAN
- P→BAP
- R→BAR
- S→BAS
- T→BAT
- Y→BAY
Not all of them are equally reachable, which a bare count of 13 hides. BA hooks on 12 distinct letters, and the ones you are likeliest to be holding are A (49% of opening racks), N (36% of opening racks) and R (36% of opening racks). The rarest is Y, at 14%.
How often you can actually play it
Out of an opening rack, 6.06% of the time you hold the letters for BA outright, the 44th least likely of 96 — tied with 15 others. Counting a blank as whichever letter is missing lifts that to 12.69%, though spending one of the two blanks on a two-letter word is rarely the play. Exact hypergeometrics over the 100-tile bag, not a simulation.
It reverses
BA backwards is AB, which is also good. That is how most of this list is actually learned — 46 of the 96 come in reversible pairs, so knowing one gets you the other free.