West Indies were 69-1 at close in reply to Pakistan`s big first innings total of 579-3 declared on the second day of the first day-night Test in Dubai on Friday.
Kraig Brathwaite was unbeaten on 32 and Darren Bravo on 14 not out at close as West Indies need to reach 380 to avoid follow-on.
Azhar Ali hit a maiden triply hundred with 302 not out to anchor Pakistan`s innings which also had contributions from Sami Aslam`s (90), Babar Azam (69) and Asad Shafiq (67).
This is the second ever day-night Test after Australia and New Zealand played the first at Adelaide in November last year.
The remaining two Tests in the series will be played in Abu Dhabi (October 21-25) and Sharjah (October 30-November 3).
WEST INDIES INNINGS; PAKISTAN 579/3d
DAY 2 Stumps
Over 22 || Score 69/1 (Kraigg Brathwaite 13; Darren Bravo )
Second day's play concluded with West Indies still trailing Pakistan's huge first innings total of 579 by 510 runs. The visitors have lost Leon Johnson, falling to the guile of Yasir Shah.
Kraigg Brathwaite and Darren Bravo are the unbeaten batsmen.
Over 10 || Score 36/0 (Kraigg Brathwaite 13; Leon Johnson 15)
So far so good for West Indies. Both the openers survived couple of big shots, but yet to be separated. For Pakistan, it's primarily the pace attack with Mohammad Amir, Sohail Khan and Wahab Riaz sharing Yasir Shah, the legbreak googly bowler.
Windies still trail be 543 runs.
Over 155.3 || Score 579/3d (Azhar Ali 302; Misbah-Ul-Haq 29)
That's historic. Azhar Ali hits a four through the cover to bring up his maiden triple hundred. With that Pakistan also declared the innings.
Azhar thus became the fourth Pakistani batsman to hi a triple-ton, after Hanif Mohammad, Inzamam-ul-Haq and Younis Khan.
22 overs' play still left in the day.
Over 145 || Score 530/3 (Azhar Ali 272; Misbah-Ul-Haq 10)
West Indies managed to remove a dangerous looking Babar Azam, thanks to a brilliantly toss up delivery from Devendra Bishoo. Good catch by Jason Holder at cover.
WICKET: Babar Azam c Holder b Bishoo 69 (105b)
That happened off the fifth ball of 143rd over.
But their worry is far from over, Azhar Ali continuing as if nothing has even happened. The Pakistan opener became the first player to hit a double ton in pink-ball Test.
He has been joined by imperious Misbah-ul-Haq.
Over 135 || Score 463/2 (Azhar Ali 237; Babar Azam 48)
Azhar Ali continued to pummel West Indies bowlers. He has already scored his Test best score, and his batting partner Babar Azam also looking good.
Over 110 || Score 355/2 (Azhar Ali 180; Babar Azam 12)
Finally, the second wicket for visitors in the form of Asad Shafiq, who chipped it straight back to the bowler (Bishoo). The here of ODI series Babar Azam came out at number 4 for Paksitan. Azhar Ali is still presemt on the crease and he is inching towards his double century.
WICKET: Asad Shafiq c & b Bishoo 67 (119b)
Over 100 || Score 316/1 (Azhar Ali 152; Asad Shafiq 57)
In the first over of Day 2, Shafiq survived a close call by Gabriel. West Indies were not sure so they didn't went for the review. Asad completed his fifty with a beautiful drive, which went between extra-cover and mid-off.
DAY 1 Recap
Pakistan closed the opening day of the day-night first Test, played with a pink ball, against West Indies on 279-1 in Dubai on Thursday.
Azhar Ali smashed an unbeaten 146 while Asad Shafiq was 33 not out after Pakistan won the toss and opted to bat in the second ever day-night Test in cricket history.
Ali put on 215 for the opening wicket with Sami Aslam, who fell for 90 in a match which marked Pakistan`s 400th Test.
New Delhi: Live score and live updates from Day 2 of Asia's first day-night Test being played between Pakistan and England at Dubai International Cricket Stadium.