In chess, some moves, such as castling, capturing en passant, and moving pawns forward two squares instead of one, are fairly recent innovations.
In the game of Go, komi is now almost universally accepted, though it did not start to become standardized until around eighty years ago.
When the rules change, new lines of thought are necessary to find the best lines of play.
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But even when the rules do not change, the perception of what the “best line of play” is still changes.
The rules of chess haven’t changed for about five hundred years. But the popularity of the King’s Gambit has waxed and waned over time. A few hundred years ago, it was thought of as one of White’s better options, sacrificing a single pawn to give White a lot of early tempo and attack openings. Later, though, more extensive analyses showed Black to be able to defend its position with accurate play, but also that Black would often have to give up a pawn in return, balancing the material.
What was once considered a flashy but still powerful and dangerous attack is now simply one of a series of openings/systems (such as the Ruy Lopez/Spanish game, the Stonewall Attack, etc. etc.) that high level players must be prepared to face.
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Using the King’s Gambit against high level players will probably not result in any particular advantage. In fact, if the player using the King’s Gambit has not studied the analyses thoroughly, it could very well be that the opponent will have the advantage.
But a player that has studied the King’s Gambit can do quite well with it against low to intermediate level players that have not studied the King’s Gambit.
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The King’s Gambit sums up how I currently feel about KJF, and a lot of other lines of play in Axis and Allies. It’s less about “right” and “wrong” than it is about having a wide arsenal of strategies and tactics that can potentially see an opponent unprepared.
If you’re a intermediate chess player that has thoroughly studied and prepared for the Ruy Lopez, you could still be caught off guard by the Sicilian Defense.
Advanced chess players study the Ruy Lopez, the Sicilian Defense, the Caro-Kann, and all sorts of other openings, so they don’t get caught unprepared.