# Can both chess players promote all their pawns to queens? [duplicate]

In standard chess rules, a pawn is promoted if it reaches the far side of the board. Usually, the pawn's owner chooses to promote it to a queen.

Is it possible for 18 queens to be on the board at once, in a legal game of chess? (Two original queens, plus all promoted pawns). Assume the players co-operate to allow this. However, if the game reaches checkmate, it must stop.

While definitely not as orderly as my last solution, it seems this works. Not sure if it can be improved in terms of number of moves, there are quite a few non-pawn moves in there (required for the captures and avoiding checks). EDIT: Actually, it seems this is a solution to the exact same problem, which solves it in 96 half-moves (as opposed to my 139).

PGN:

1. e4 d5 2. e5 d4 3. e6 Bd7 4. d3 f5
5. exd7+ Kf7 6. Be3 dxe3 7. d4 e5 8. d5 Qe7
9. d8=Q e2 10. Kd2 e1=Q+ 11. Kd3 e4+ 12. Kd4 e3
13. f4 e2 14. d6 Q1h4 15. d7 e1=Q 16. Qc8 Nf6
17. d8=Q b5 18. Bd3 b4 19. Be4 fxe4 20. c4 Qeg3
21. c5 a5 22. c6 Ra7 23. Nc3 bxc3 24. b4 Rb7
25. cxb7 Na6 26. b8=Q a4 27. b5 Nc5 28. b6 Nb3+
29. axb3 a3 30. b7 a2 31. Qa8 c2 32. b8=Q c1=Q
33. b4 c6 34. b5 e3 35. Rb1 Qca3 36. Rb2 a1=Q
37. b6 e2 38. b7 e1=Q 39. Qba7 g5 40. b8=Q Nd7
41. Ne2 Ke6 42. Ke4 c5 43. Rd2 c4 44. Rd3 c3
45. Rf3 c2 46. Rhf1 c1=Q 47. h3 Qh2 48. g3 g4
49. Qe8 gxf3 50. Rg1 f2 51. g4 f1=Q 52. g5 Q4f2
53. g6 h5 54. g7 Qcb2 55. Qed8 Qec5 56. f5+ Kf7
57. f6 Be7 58. Rh1 Kg6 59. f7 Rh7 60. g8=Q+ Rg7
61. f8=Q Qhg3 62. Rg1 Qgg5 63. Rg4 hxg4 64. h4 g3
65. Qdd5 Ne5 66. Qdb7 Nf7 67. h5+ Kf6 68. h6 g2
69. h7 g1=Q 70. h8=Q

Again, animation welcome.

• Thanks for putting in the effort again! It does seem to be a duplicate question though, so I have marked it as such. Dec 4, 2017 at 21:09
• No problem - I liked doing it anyway! Dec 4, 2017 at 21:19