Christopher Randles plays as white, and if he wins this market resolves to YES.

Pat Scott plays as black, and if he wins this market resolves to NO.

In case of a draw this market resolves to 50%.

One rule is added to the chess ruleset.

The rule is "fair": it doesn't give advantage to any side, is symmetrical, does not depend on the move index.

The rule is unknown to the players at start.

Before making a move the player can choose one instrument:

1) Legality check. Name three 2-halfmove continuations of the game. I will tell which moves would be illegal in the lines. Example: "13.Ra4 bxa4, 13. Ra5 b3-b4, 13. Qb2 b3-b4" -> "b3-b4 after Qb2 is illegal".

2) Question. Ask me a question and I will answer Yes|No|NA.

3) Gamble. I will tell 4 moves available in the current position. One of them will be the best in my opinion, one will be the worst, it is not revealed which is what. The player does NOT have to play any of the four moves.

Any information is revealed to both players.

Time control will be added if appears to be needed.

Game is played in the comments.

The board picture in the description will be updated.

Position before black's move 39

https://lichess.org/editor/3N4/8/4Rbr1/p2P2kP/2PN1P2/P2R4/1P1KBP2/8_w_HAha_-_0_1?color=white

Move history:

1. g3 a5

2. e3 --

3. Ne2 d5

4. Bg2 e5+Bg4 (compensating for the mistake of the judge on move 2)

5. h3 Nf6

6. h3xg4 Nc6

7. a3 g5

8. d4 Bg7

9. Nb1c3 h5

10. Pxh5 Ne7

11. Pxe5 Ng4

12. e4 Bxe5

13. Ng1 c6

14. Nge2 f6

15. Bf3 Qd7

16. Pxd5 0-0-0

17. Ng1 b5

18. Bxg5 f5

19. Bxg4 Qe6

20. Bxe7 Kd7

21. Be2 Kxe7

22. Qd3 Bg7

23. 0-0-0 Qf6

24. Rh4 Rh8-f8

25. Nf3 Qр6+

26. Qe3+ Qxe3

27. Re4+ Kf6

28. Rxe3 Bh6

29. Nd4 Kg7

30. Rd1-d3 Rf6

31. Kd1 Bg5

32. N(c3)xb5 Kg6

33. c4 Rf7

34. Re6+ Bf6

35. Nxc6 Kg5

36. Nxd8 Rg7

37. Kd2 f4

38. Nd4 Rg6

39. Pg3xf4 ...