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This has already been covered over on Puzzling Stack Exchange. Courtesy of @xnor, the shortest possible game is in 31 moves. You can read the proof over there. [FEN ""] 1. Nf3 Nf6 2. Nd4 Nd5 3. Nc6 dxc6 4. g4 Bf5 5. gxf5 h5 6. f4 Nd7 7. e4 Ne5 8. fxe5 Qd6 9. exd6 exd6 10. exd5 g6 11. Na3 Bg7 12. Rb1 Bd4 13. h4 Bc5 14. d4 g5 15. hxg5 Rh6 16. dxc5 ...


I interpret the following White will play as long as possible, and not want to lose. Black will claim a draw as soon as possible, if not win as meaning that Black does not help (i.e., Black tries to either win or draw as fast as possible, while White tries to make the game as long as possible and then draw or win). I suggest the following position with ...


The answer is trivially the starting position - [fen ""] This exact question hasn't been asked before (I think) but it has been answered here. Here is the relevant part of that answer - The maximum number of moves in a chess game is not infinite, it's 11797 plies = 5898 moves and a half. This is due to the fifty-move rule. As an interim ...


Adding on to @Brian Tower's answer as anticipated, here is an improved position with 55 attacks, using double check and White's full arsenal. Black last moved a piece to e7 that White's rook captured with checkmate. [FEN "B7/4R3/3Q1Q2/2Q3Q1/2N1k1K1/1R4Q1/1BNQNQN1/8 w - - 0 1"] However, it is also possible for both sides to attack under the OP's ...


There seems to be some confusion understanding the problem, so I will post an answer, probably not the maximum, and then somebody better than me can post the best solution. I've promoted 7 pawns to queens and one pawn to a knight. [fen "R7/7b/3qnq2/2q3q1/2n1K1n1/2q3q1/3q1q3/7k w - - 0 1"] Each of the 8 queens attacks 5 squares around the king = 40 ...


I may be missing something, but it seems that white needs their bishop to be on c6 and their queen to be on h8. If one of these is accomplished by changing the setup of the problem, then the other can be accomplished through white's move.


As for fixable ... that rather depends on what the presumed composer wanted to do. Or what history this particular problem had and what possible mistranscriptions it may have passed through during transmission. In extreme cases, it might be a 'place a white piece on the board to make this a self-mate in 5' type of problem that isn't correctly remembered. Or ...


« deeper in the game » ... well, good luck! My friend has published (France-Échecs) his 9-move solution (not 8 as I misprinted it in an earlier post) and this solution is a beauty! Here is the end FEN: 8/8/8/1N6/3PP1P1/5Q2/PPPB1P1P/1K1R1BNR


I think four moves will suffice: 1 b3 ... 2 Bb2 3 g3 ... 4 Bg2. This way, the rooks will also be protected. The need to protect bishops will happen deeper in the game.

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