The meaning of "It took a while to occur"?
The topic is Chess:
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It took a while to occur, as tournaments were rarer in those days, but they next met in Bad Kissingen 1928.

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Hello Nophig,
Probably there was a previous Chess tournament taking place then because the  tournaments were rare those days the next one in 1928 took a long time to take place since the previous one. It didn't happen right after it , it didn't happen after a short period of time, but took quite long to occur.

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the meaning for "it took a while to occur" means that something has taken a while or alot of time to happen

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Can also be phrased as 'ít took a while to eventuate'