What will white (Manifold) play in move 19?

The game so far: 1. e4 e5 2. Bc4 Nf6 3. Nc3 Nc6 4. Nf3 Nxe4 5. Nxe4 d5 6. Bd3 dxe4 7. Rg1 Bf5 8. Bb5 exf3 9. Bxc6+ bxc6 10. Qxf3 Qd7 11. Qc3 f6 12. g4 Bxg4 13. Rxg4 h5 14. Re4 Qd5 15. Qf3 Rd8 16. d3 a6 17. b3 Qc5 18. Kd1 a5

For each response, the average probability in the last four hours before close is measured. With 75% probability, two moves will be randomly drawn, with weight proportional to those market probabilities. With 25% probabilities, three moves will be randomly drawn in the same way. Then for each of the two or three candidate moves, a conditional market is created.

The score of each move will be determined by the average probability in the last 4 hours.  The move with higher score will be chosen (and the corresponding condditional market will resolve to the score one move later. The other market(s) will resolve N/A).

https://manifold.markets/harfe/will-white-win-in-manifold-plays-ch

Any resign moves or draw offeers are not allowed in this move!

Invalid moves or duplicate moves will be removed from consideration.