With so many scoring opportunities on the board, opening the bottom row isn't a significant additional risk: opponent will reply with an average 38 points after AERIFY or 37 after DEIFY or RIDGY. The problem with DEIFY is that it sets up a new little (4-point) hotspot for Kaufman at C13, while eliminating small hotspots in Chew's favour at B2, K5 and M5. In other words, DEIFY scores only eight points for the F while giving Kaufman a chance at just as many for it, instead of saving the tile for a play in which it can earn 12 or 16 points. The problem with RIDGY is of course that even though it plays off the troublesome, potentially doubled DG, it scores too few points in doing so and wastes the Y.
In unlimited-depth simulations with DG known to be on opponent's rack, Maven favours ABODE 15F 29 (wins 76% of the time) over ADOBE (75%) and CADGE D8 32 (72%). The important issues here are endgame timing and opponent rack information.
ABODE and ADOBE are better than CADGE even though CADGE scores three more points this turn and five more next turn, because they leave one less tile in the bag, shortening the game by an average of half a play and improving the chances of playing out in two moves from 45% to 80%. This is especially important when there's a danger of running overtime: playing CADGE means a 16% chance of having to spend time finding a third move, compared to 7% for ABODE or ADOBE; and if Kaufman needs to make up a ten-point time penalty, his chances of winning drop to about 60%.
On the other hand, if it isn't known that Chew still holds DG, CADGE becomes a better play because it plays off a D and a G with two more of each to come. In this case, each of ABODE, ADOBE and CADGE win about 68% of the time with no time penalty, or 61% with a ten-point penalty.
One might also consider blocking Chew's hotspot at H1 with either DOGE 3G 18 or EGAD 3h 19. This would be a good idea if external (tournament) conditions required only that we not lose by a large margin; otherwise, since there's only a 10% chance of Chew making a 70-point play at H1, the ten-point sacrifice isn't worth the seven-point risk.
Joel also suggests OBE 15F 20, given that we know Chew holds DG, saving the possibility of playing CADGE on the next turn. The board doesn't merit the delay though, as after CADGE Kaufman can expect to average 36 pt, compared to only 32 pt after OBE.
Much better would have been ZIG 3G 32, which scores best while blocking H1 plays and forcing Kaufman to keep any Is he has if he wants to play the K at H4. ZIG wins 83% of the time compared to 50% for RID. Kaufman has to go two more minutes overtime for RID's winning percentage to hit 80%. If Chew had spent another few seconds on this play, he might have seen RIGID M3 18, which wins 60% of the time but only needs Kaufman to go overtime by one more minute to win close to 80% of the time. Joel points out that RIGID D11 is even better, though it requires Chew to spend a few more seconds scanning the rest of the board to find it.
Note that BIKE H2 38 or DIKE H2 37 score better this turn but lead to longer endgames and win only 16.5/36 and 15.5/36 respectively.