Thanks for playing, the computer and game knows about 200k English words and uses a lot of regular expression searching to figure out strategies of how to best play.
I didn’t think about people with 4k screens, I really should have considered that.
That the game didn’t recognize the word PUB in left->right or top->down direction is really strange. It is in the wordlist:
… PUB PUBBED …
For game end, the game follows the logic of “when a tile can’t be placed” which happens after the player selects a tile when the board is full. Which in hind-sight might not seem the most logical solution but follows how tetris works, that it’s the out of bounds piece that ends the game.