It's WEIRD to add a RESERVE DAY "ONLY" for the India Pak Super 4 game
but we all know it's "ALL ABOUT MONEY" which India-Pak game GENERATES.

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https://www.espncricinfo.com/story/asia-cup-2023-india-vs-pakistan-the-only-super-fours-game-with-reserve-day-1397047

India vs Pakistan the only Asia Cup Super Four game with a reserve day

This is a change from the earlier playing conditions, which had a
reserve day only for the final on September 17

A reserve day has been added to the India vs Pakistan Super Four game of
the Asia Cup on September 10. It is the only match apart from the final
to have a reserve day. The change to the playing conditions was
announced by PCB, advising spectators to hold on to their tickets should
a reserve day be required.

For both the matches with the provision for a reserve day, efforts will
be made to complete the match on the original day even if it means
shortening the contest. If the reserve day is triggered, the duration of
the contest will remain the same as on the last ball of day one.

Rain had forced a washout in Pallekele when the two teams first faced
each other in this Asia Cup. Rain then returned in India's first
international match against Nepal, at the same venue, but it wasn't as
persistent on the day, allowing India a 23-over chase, which they aced
to qualify for the Super Four.

The late decision to add a reserve day for only the India-Pakistan match
in the Super Four round didn't go down too well with Bangladesh coach
Chandika Hathurusinghe

"I haven't seen this kind of thing in another tournament, this changing
rules in the middle of the tournament," he said at a press conference.
"I am sure there is a technical committee that has representations from
every participating countries. They must have decided for some other
reason. Yes, it is not ideal. We would love to have an extra day also.
Other than that, I don't have much to comment because they have made a
decision.