5
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There are two questions to answer here:

  1. Who will win this game of chess?

  2. What were the last 96 individual moves (ply) by both sides? The solution is unique.

Gyula Breyer The Chess Amateur 1922, Correction By Gerd Wilts

enter image description here

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  • $\begingroup$ Is the board orientation a given or do we have to work that out too? $\endgroup$ – Dr Xorile May 11 at 21:15
  • $\begingroup$ Here's a link if anyone wants to play. $\endgroup$ – Dr Xorile May 11 at 21:21
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    $\begingroup$ @Dr Xorile The orientation is a given-White on bottom, Black on top. $\endgroup$ – Rewan Demontay May 11 at 21:52
  • $\begingroup$ Are we given whose turn it is? $\endgroup$ – Oliver Ni May 11 at 22:07
  • $\begingroup$ @OliverNi No, that is part of the retro analysis. $\endgroup$ – Rewan Demontay May 11 at 22:19
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This game is drawn due to the 50 move rule.

Previous moves, going backwards:

1. ... Qb6b5
2. Rb5a5 Qa5b6
3. Rb6b5 Bb5a4
4. Ra4b4 Qb4a5
5. Ra5a4 Ba4b5
6. Rb5b6 Rb6a6
7. Ra6a5 Qa5b4
8. Rb4b5 Bb5a4
9. Ra4b4 Bb4a3
10. Ra3a4 Qa4a5
11. Ra5a6 Ba6b5
12. Rb5a5 Ba5b4
13. Rb4b5 Qb5a4
14. Ra4a3 Ra3b3
15. Rb3b4 Bb4a5
16. Ra5a4 Qa4b5
17. Rb5a5 Ba5b4
18. Rb4b3 Qb3a4
19. Ra4b4 Bb4a5
20. Ra5b5 Bb5a6
more coming

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  • $\begingroup$ Accidentally submitted early, still working on it $\endgroup$ – Oliver Ni May 11 at 22:26
  • $\begingroup$ That is the correct answer, and all of your retro moves are 100% accurate so far! $\endgroup$ – Rewan Demontay May 11 at 22:39
  • $\begingroup$ What is your current progress? $\endgroup$ – Rewan Demontay May 31 at 17:14
  • $\begingroup$ Sorry, it doesn't seem too hard to trace it back just haven't had the time $\endgroup$ – Oliver Ni May 31 at 21:00
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PARTIAL SOLUTION:

white will gain a clear material advantage and win the game 1. Nxa6+ Kxe6 2. Bxa2 Qxa5 3. Nxb3 Qd8 4. Naxc5+ Kf5 5. bxa3 Qd1 6. Qxa4 Kg4 7. Na5 Qa1 8. Qb3 b6 9. Rxb6 Kh3 10. Rb7 Qg1 11. Nd3 Qg5 12. c5 Kg2 13. Qe6 Qg3 14. Rb1 Qf3 15. Qxe5 Qxd3 16. cxd3 Kf3 17. Qg3+ Ke2 18. Rb2+ Kd1 19. Qg1#

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