Just to clear it up, Mhatre was retired out, not retired hurt. According to IPL rules, a batsman who retires out is counted as dismissed and cannot return later in the innings. That's not the case with retiring hurt, where the player may come back. CSK deliberately gave up Mhatre's wicket to boost the team's total.
(https://i.ibb.co/Kcx0ZWnM/8se8wwwg7oug1.jpg)
He was struggling and doesn't have the finishing skills to carry the bat. He should open with Sanju. Today Tuk‑Tuk Raj's innings was unbearable; Brevis would have been a better choice than Dube.
Mhatre ought to open; he's the most effective at using the powerplay compared to Gaikwad, Sanju, and himself. Gaikwad's innings made the difference between a total of 215 and 230 for them.
Anyone who saw the match knows how brutal the conditions were—by the time Sanju hit his century he was drenched in sweat. Mhatre even signalled for the physio, but the next ball was the last before the strategic timeout, so he kept batting. Considering he's just 19, he did his job brilliantly.
Retired hurt should only be allowed when there's a genuine injury; otherwise it's like a hit‑wicket, giving extra advantage to the batting side. It's turning the game into a batsman's contest, though CSK didn't break any rule.
Sorry, OP, nobody seemed to get your question; I don't know the answer either.
CSK's batting looks stronger without Tuk‑Tuk Raj.
Nobody seemed to notice how drenched the players were in the death overs. The humidity in Chennai and fatigue stopped them from accelerating; Ayush was literally panting. Retiring him out was the right call. At first I thought CSK's decision to send Dube instead of Brevis at that crucial moment was poor. They could have at least sent Sarfu in place of Dube for a power‑hitting cameo.
Because he has a big ...
I think it was a great call. In fact, they could have made the decision a few overs earlier. Both Mhatre and Sanju looked exhausted in the sweltering conditions at Chepauk. In the 14th and 15th overs they were just rotating the strike, barely hitting. Sending Dube out earlier would have given him a few more balls to add to his score.
I caught a Haryanvi commentary where Anil Chaudhary explained it well. He said if a batsman claims retired hurt without a real injury and the umpire doubts it, the umpire can declare it a retirement out. That's probably what happened—Ayush Mhatre showed no signs of injury or cramps and just walked off, so it was ruled a retirement out, not retired hurt.