Matt's Best Move?

(In case it's not clear, the z(20) in white at the far right on the bottom was just captured and is out of play). I'm pretty sure Matt has a single best move in this situation, but I welcome disagreements. Part of the problem is that it's just so likely to end in a draw, I think we racked up four drawn rounds before this game was over (I should have set the V to 11)

Game #21110  •  ElihuRoot (Coil) vs. Matt (bowler190)  •  Round #3

UBFC 145

Opponent's turn to attack

p(4) (12) p(20) (20) (V) Button: Coil Player: ElihuRoot

W/L/T: 1/0/1 (3)  •  Score: 12 (-20 sides) Dice captured: z(20) (12) 8 p(20) 10 (V=12) 1 1 z(4) 2 z(4) 2 z(20) 12 z(20)  16  z(20) Dice captured: p(4), (20) W/L/T: 0/1/1 (3)  •  Score: 42 (+20 sides)

Player: Matt Button: bowler190 z(4) z(4) z(20) z(20) z(20)