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Sep 29 at 2:41 vote accept JKHA
Aug 17 at 21:03 comment added Daniel Mathias @BenjaminWang Trivial lower bound is 9 moves on each board, as black must make 8 captures in one game.
Aug 17 at 17:04 comment added Benjamin Wang Trivial lower bound is 8.5 moves on each board. Because we need 30 total captures which requires at least 7.5 moves on each board. And the first 1.0 moves no one can capture.
Aug 17 at 11:11 comment added wimi I would suggest to be consistent with using the term "game" for a sequence of moves and "position" for a board state. I was also confused by the meaning of "overlapping the two games": i thought it meant interleaving the moves of the two games!
Aug 17 at 7:33 answer added Albert.Lang timeline score: 2
Aug 15 at 22:13 history edited JKHA CC BY-SA 4.0
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Aug 15 at 12:46 comment added dan_fulea Let me type some words, to see if i understood the situation. There are regular moves of two chess games, $A,B$, having the same number $N$ of half-moves, they may be not ended. After these $N$ half-moves we take a new chess board $C$ and teleport all pieces from the boards $A,B$ to their final positions, except for the black $A$-king, and the white $B$-king. There are no collisions of two pieces landing on the same square. This position must be regular, achievable from a normal chess game. Is it so? Well, it may be hard to prove minimality...
Aug 15 at 4:15 history asked JKHA CC BY-SA 4.0