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In Test cricket, a lower-order batter sometimes goes in ahead of a specialist batter when a wicket falls late in the day. I understand the basic idea is to protect a key batter from a short spell before stumps, but it seems risky to use someone less equipped to handle the bowling.
How do teams decide when a nightwatchman is worth sending in? Does the decision depend more on the time left, the pitch and conditions, or the match situation?
