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They could have a harder fight and still give the win to the antagonist. Or use mind games: let's say the underdog comes up with a plan that gives the impression to the antagonist that he's winning...
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#3: Attribution notice added
Source: https://writers.stackexchange.com/a/27335 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
They could have a harder fight and still give the win to the antagonist. Or use mind games: let's say the underdog comes up with a plan that gives the impression to the antagonist that he's winning and that everything is going as expected and underestimating his opponent. Then the underdog makes his play and wins. But a well structured mind game.