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Advanced chess engines can report a forced mate (for some given position) within a huge number of moves. For example, mate in 40 or 50 is not unheard of. Theoretically, is it possible that there exists an 'n' such that White(/Black) has Mate in n, right from the opening? That is, is it possible that there exists a forced checkmate sequence for White(/Black)?

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    it's possible, but I wouldn't bet on it. Chess isn't solved, but the vast majority of decent chess players believe optimal play leads to a draw, informed by chess engines and so on.. – CognisMantis Jul 23 '20 at 7:29
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    Engines can see sequences of mate in 40 when the move tree is not very wide. From the opening it'd be impossible to calculate – David Jul 23 '20 at 8:14
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    No, mathematically it's not possible. Even forced mate in 20 isn't either if the engine goes deeper node. – Amlan Saha Kundu Jul 23 '20 at 9:03
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    what you mean by 'from opening'?In some openings, like Ruy-Lopez there are variations in chess openings encyclopedia that are 56+ moves long... from that position nowadays definitely could be possible to calculate till end of game-but most probably that would be a draw. If you mean from starting position-that is currently technically impossible as there are more possible moves in chess game than atoms in known universe-so storing a move per atom would not be enough... But I have seen engine announcing mate in 25 on move 6 after few hours in a suspicious/dubious opening not played at GM level – Drako Jul 23 '20 at 10:03
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    @David I understand it would be impossible to calculate, I'm just asking if it's theoretically possible. – HPP_00 Jul 24 '20 at 6:18