The in-form Kaushal, who has now three 100-plus scores from seven matches, eclipsed Ajinkya Rahane's 187 for Mumbai against Maharashtra in Pune in 2007-08.
In List A cricket, which includes ODIs, the 200-mark has been breached six times by Indian batsmen -- Rohit Sharma (thrice), Virender Sehwag, Shikhar Dhawan and Sachin Tendulkar one each. But it is for the first time that this has happened in Indian domestic cricket.
Kaushal also shattered the record for the highest opening stand in List A cricket in India when he along with his opening partner, Vineet Saxena (100 runs of 133 balls), put on 296 runs to lay the foundation for Uttarakhand's 366 for two in 50 overs.
Shikhar Dhawan and Aakash Chopra had put on an unbeaten 277 for Delhi versus Punjab in 2007-08 in the previous highest opening stand.
"I felt very nice when I completed it, but I didn't know then that it was a record. I never expected it," the 27-year-old said.
"Only when I was about 30 runs short, I said to myself 'Okay, I can try for a double-century'. I got to know that I was the first one to score a double-century after I came back to the dressing room."
Sikkim's decision to bowl first backfired at the GS Patel Stadium as openers Kaushal and Saxena feasted on the bowling.
Kaushal, who debuted against Bihar in this tournament, smashed 18 fours and nine sixes in a strike rate of 149.63 on the way to his third 100-plus score -- the most in the tournament so far.
Kaushal's first century (101) was against Puducherry, while in the last match he scored 118 versus Mizoram. He now has 467 runs in seven matches at an average of 77.83 and strike-rate of 122.25, second to Meghalaya's Bisht (488 runs).
Chasing the huge target, Sikkim's outing with the bat too turned out to be one of misery as they lost four wickets for 42 inside 12 overs before half centuries by Lee Yong Lepcha and Padam Limboo took them to 167 for six in 50 overs.
The victory also kept afloat Uttarakhand's hopes of qualifying for the next round as they moved up to the second spot with 24 points from seven matches.
With one more game remaining for them against Arunachal Pradesh, they not only need to win that game but also hope that Bihar lose their last match against Mizoram in order for Uttarakhand to get through to the quarters.
One team from the plate group makes the quarters.
At Anand: Mizoram 100; 42.3 overs (Taruwar Kohli 33; Inakato Zhimomi 3/8, Imilwati Lemtur 3/24) lost to Nagaland 102/2; 12.5 overs (Nitesh Lochab 49 not out; Zorinliana 2/21) by eight wickets.
At Nadiad: Uttarakhand 366/2; 50 overs (Karn Veer Kaushal 202, Vineet Saxena 100; Mendup Bhutia 2/82) beat Sikkim 167/6; 50 overs (Lee Yong Lepcha 65, Padam Limboo 51 not out; Deepak Dhapola 3/19) by 199 runs.
At Vadodara: Meghalaya 238/5; 50 overs (Yogesh Nagar 67 not out, Puneet Bisht 58; Jitender 3/29) beat Manipur 170; 45.4 overs (Yashpal Singh 106 not out; Lakhan Singh 3/24, Mark Ingty 2/23) by 68 runs.
Group B: Unbeaten centuries by Samarth Singh and Akshdeep Nath went in vain as Andhra Pradesh pipped Uttar Pradesh by one wicket in a thrilling group B Vijay Hazare Trophy match here in New Delhi on Saturday.
Chasing a target of 331 runs, Andhra Pradesh's openers Ashwin Hebbar (64 off 47) and Srikar Bharat (39 off 54) got the team off to a great start with an 84-run stand in 12 overs before the former was run-out.
Skipper RK Bhui was dismissed two overs later before Bodapati Sumanth (43) and Ravi Teja's unbeaten 79 off 83 helped them cruise to victory with three deliveries left.
Earlier, put in to bat, Uttar Pradesh were reduced to 45 for 3 before Samarth and Akshdeep's unbeaten knocks of 115 and 119 along with captain Suresh Raina's 52 took their side to 330 for four in 50 overs.
Uttar Pradesh 330/4 in 50 overs (Akshdeep Nath 119*, Samarth Singh 115*; Karn Sharma 1-41) Andhra Pradesh 331/9 in 49.3 overs (Dwaraka Ravi Teja 79*, Ashwin Hebbar 64; Akshdeep Nath 3-44) Andhra one by one wicket.
Saurashtra 110 all out in 34.4 overs (AV Vasavada 34 off 55 balls, CS Jani 16 off 24 balls,) Chhattisgarh 111 for one 24.2 in overs (Rishabh Tiwari 56 off 90 balls, Manoj Singh 36 off 56 balls.) Chhattisgarh won by 9 wickets.
Odisha 247/8 in 50 overs (Govinda Poddar 93, Subhranshu Senapati 41; Chama V Milind 6-43) Hyderabad 250/9 in 49.2 overs (Tanmay Agarwal 76, Akshath Reddy 63, Kolla Sumanth 43*; Papu Roy 3-38) Hyderabad won by 1 wicket.
Group A: Meanwhile in Group A, the match between Maharashtra and Mumbai in Bengaluru was abandoned without a ball being bowled.
Karnataka defeated Himachal Pradesh by 35 runs via the VJD method, after the former put up a total of 257/8 in the first innings. R Samarth top-scored with 98 runs. In reply, Himachal Pradesh were bowled out for 162 in 25.3 overs.
Lastly, Vidarbha defeated Railways by 15 runs via the VJD method. Railways put up a total of 226 runs for the loss of eight wickets in the first innings, with number 10 batsman Madhur Khatri surprisingly top scoring with 58 runs. Vidarbha were always in a good position during the chase, and even though the match was interrupted by rain with Vidarbha batting on 176/3 by the end of the 37 overs, the total was enough to give them the victory through the VJD method.
First Published: October 6, 2018, 10:29 PM IST