Too many surprises. note While the tides can turn fairly quickly in a game of chess, it almost always takes more than one move for the changes to take effect. Unless the players are complete amateurs, no trap or sacrifice will offer an immediate advantage. Fictional chess masters, however, will often perform unexpected maneuvers, occasionally resulting in a Surprise Checkmate — something that is next to impossible to pull off against an opponent who's paying attention to the game.
Because in fact even at high-level play folks oftentimes blunder and err and then you can have the situation change in a heartbeat. Sure, it usually takes more than one move from there to get to resignation/mate, but one move can be sufficient for the situation change.
"For a successful technology, reality must take precedence over public relations, for Nature cannot be fooled." - Richard Feynman
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Because in fact even at high-level play folks oftentimes blunder and err and then you can have the situation change in a heartbeat. Sure, it usually takes more than one move from there to get to resignation/mate, but one move can be sufficient for the situation change.
"For a successful technology, reality must take precedence over public relations, for Nature cannot be fooled." - Richard Feynman