OX
Worth 9 points before any premium square, and the highest-scoring of the 96 — tied with 5 others.
OX extends into 10 three-letter words, which is the 45th most extendable of 96 — tied with 8 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
- B→BOX
- C→COX
- F→FOX
- G→GOX
- L→LOX
- P→POX
- S→SOX
- V→VOX
- O→OXO
- Y→OXY
Not all of them are equally reachable, which a bare count of 10 hides. OX hooks on 10 distinct letters, and the ones you are likeliest to be holding are O (45% of opening racks), L (26% of opening racks) and S (26% of opening racks). The rarest is Y, at 14%.
How often you can actually play it
Out of an opening rack, 2.84% of the time you hold the letters for OX outright, the 7th least likely of 96 — tied with 1 other. Counting a blank as whichever letter is missing lifts that to 8.86%, 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.