The lack of a set definition of a miniature, if true, is a consequence of a world where facts no longer exist. No credible book of miniatures has games lasting more than 25 moves. To find ambiguity in a resignation where there is forced checkmate that goes past the 25th move is comparable to finding a lack of consensus among climate scientists because a nuclear physicist has an opinion that differs.
Most books and articles cap the length of miniatures at 20 moves, for instance, https://sahovski.com/Encyclopaedia-of-Chess-Miniatures-volume-2-p430443098
As lukeluke00 points out in post 16817, there isn't really a set definition of miniature, and what gets called a "miniature" can depend upon where you look. When I was young books often kept them to games less than 20 moves, but some of the chess magazines would present games under 25 moves as miniatures. Within the context of this thread, the general consensus (though not universal), is that a game of under, but not including 30 moves (so 29 moves or less) is in the spirit of the thread. Personally, I think if the game ends in mate on the board in 29 or fewer moves then it's a miniature (for this thread), but for a win by resignation (without a forced mate under 30), that probably should be under 25. But that's just me. There are other opinions. If you don't like the one I offered, ask me again, I've got others (
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But in the end, this thread is about sharing some games where they just went "your way" very quickly. Any "miniature" will inevitably involve mistakes by the opponent, or a very lop-sided level of skill between the players, but in my view they are still enjoyable to view. There's something beautiful in seeing a game that just unfolds in a clear overrunning of the other side, or one that is tense and balanced but suddenly explodes in a display of fireworks after a slight miscalculation by one side that gets pounced upon suddenly and with very decisive results.
I only play bots now, and generally only get such short games against the very poor ones, which make such bizarre blunders that I don't really think they are miniatures so much as the computer just giving the game away early. Like White's 5th and 11th move in this game (the first of this month's "theme bots"); the computer is begging you to finish this off in under 30.