Hartono - Khromacheva

08.10.2023, 04:10, Seoul WTA, Qualification - quarterfinal, hard
Hartono Arianne 2 : 0
(7-5, 6-4)		 Khromacheva Irina
Avatar 253. Singles ranking -. Avatar
21. 4. 1996 Birthdate 12. 5. 1995
- Height 170 cm
- Weight 59 kg
right Plays left
- Turned pro -
Surface Hartono Arianne Khromacheva Irina
Indoors 5/6 -
Clay 1/2 -
Grass 3/5 -
Hard 15/16 -
Not set - -
Year Summary Clay Hard Indoors Grass Not set
Summary: 282/214 68/55 164/113 43/33 7/13 -
2025 24/29 1/2 15/16 5/6 3/5 -
2024 33/30 1/4 32/24 - 0/2 -
2023 57/36 4/1 49/29 2/4 2/2 -
2022 26/29 9/10 8/12 7/4 2/3 -
2021 51/29 26/16 14/6 11/7 - -
2020 20/15 5/5 8/5 7/5 - -
2019 29/22 1/4 18/12 10/5 0/1 -
2018 25/10 10/4 14/4 1/2 - -
2017 9/6 6/4 3/2 - - -
2016 7/5 4/2 3/3 - - -
2015 0/1 0/1 - - - -
2014 1/1 1/1 - - - -
2012 0/1 0/1 - - - -
Year Summary Clay Hard Indoors Grass Not set
Summary: 370/238 209/118 104/83 53/29 4/6 0/2
2024 1/2 - 0/1 1/1 - -
2023 11/19 6/10 5/9 - - -
2022 40/25 27/16 13/9 - - -
2021 18/11 9/4 7/5 2/2 - -
2020 9/4 - 0/1 9/3 - -
2019 13/11 0/3 13/8 - - -
2018 29/21 9/7 16/10 3/2 1/2 -
2017 26/24 17/11 8/8 1/4 0/1 -
2016 51/21 22/6 9/5 17/7 3/3 -
2015 45/26 31/20 7/5 7/1 - -
2014 31/22 27/16 4/5 - - 0/1
2013 23/21 15/11 7/7 1/2 - 0/1
2012 34/19 22/10 7/4 5/5 - -
2011 29/8 21/3 1/3 7/2 - -
2010 10/4 3/1 7/3 - - -
 

Head-to-head: 1 - 0

Year Tournament Match S Surface 1 2 3 4 5 Round
2023 Seoul WTA Hartono 2   7 6       Q-QF
Khromacheva 0 5 4      
 

Betting odds

Hartono Arianne Khromacheva Irina
 1xBet
1.25
08.10. 03:011.25-0.12
Opening odds
07.10. 11:581.37 
3.72
08.10. 03:013.72+0.73
Opening odds
07.10. 11:582.99 
 bet-at-home
1.22
08.10. 02:271.22-0.16
Opening odds
07.10. 11:581.38 
4.00
08.10. 02:274.00+0.95
Opening odds
07.10. 11:583.05 
 bet365
1.25
3.75
 Betfair
1.27
08.10. 03:581.27+0.25
Opening odds
07.10. 08:371.02 
4.23
08.10. 03:584.23+3.21
Opening odds
07.10. 08:371.02 
 Betsafe
1.20
08.10. 00:021.20-0.05
Opening odds
07.10. 13:181.25 
4.00
08.10. 01:334.00+0.40
Opening odds
07.10. 13:183.60 
 Betsson
1.20
08.10. 00:031.20-0.05
Opening odds
07.10. 13:191.25 
4.00
08.10. 01:334.00+0.40
Opening odds
07.10. 13:193.60 
 BetVictor
1.25
08.10. 00:101.25-0.11
Opening odds
07.10. 11:321.36 
4.00
08.10. 00:104.00+0.90
Opening odds
07.10. 11:323.10 
 Betway
1.22
08.10. 00:051.22-0.16
Opening odds
07.10. 12:121.38 
4.25
08.10. 00:054.25+1.25
Opening odds
07.10. 12:123.00 
 bwin
1.22
08.10. 00:191.22-0.13
Opening odds
07.10. 11:461.35 
3.90
08.10. 00:193.90+0.95
Opening odds
07.10. 11:462.95 
 ComeOn
1.25
07.10. 14:201.25-0.07
Opening odds
07.10. 12:151.32 
3.60
07.10. 20:073.60+0.60
Opening odds
07.10. 12:153.00 
 Coral
1.22
08.10. 00:191.22-0.14
Opening odds
07.10. 11:511.36 
4.00
08.10. 00:194.00+1.00
Opening odds
07.10. 11:513.00 
 Interwetten
1.22
08.10. 00:191.22-0.03
Opening odds
07.10. 13:551.25 
3.80
08.10. 00:193.80+0.20
Opening odds
07.10. 13:553.60 
 Ladbrokes
1.22
08.10. 00:191.22-0.14
Opening odds
07.10. 11:511.36 
4.00
08.10. 00:194.00+1.00
Opening odds
07.10. 11:513.00 
 Pinnacle
1.23
08.10. 00:051.23-0.04
Opening odds
07.10. 13:181.27 
4.29
08.10. 01:334.29+0.43
Opening odds
07.10. 13:183.86 
 Unibet
1.26
3.85
 William Hill
1.22
08.10. 00:161.22-0.07
Opening odds
07.10. 13:491.29 
4.00
08.10. 00:164.00+0.50
Opening odds
07.10. 13:493.50 
Average odds
1.23
3.96
Over/Under 2.5 sets
Total Over Under
 Betsafe 2.5
2.80
08.10. 00:022.80+0.10
Opening odds
07.10. 13:202.70 
1.38
08.10. 00:021.38-0.02
Opening odds
07.10. 13:201.40 
 Betsson 2.5
2.80
08.10. 00:032.80+0.10
Opening odds
07.10. 13:192.70 
1.38
08.10. 00:031.38-0.02
Opening odds
07.10. 13:191.40 
 ComeOn 2.5
3.00
1.35
 Pinnacle 2.5
2.87
08.10. 01:332.87+0.01
Opening odds
07.10. 13:182.86 
1.44
08.10. 01:331.44+0.01
Opening odds
07.10. 13:181.43 
 Unibet 2.5
2.80
1.41
Average odds 2.5
2.85
1.39
Over/Under 17.5 games
Total Over Under
 Betway 17.5
1.36
2.90
Average odds 17.5
0
0
Over/Under 18.5 games
Total Over Under
 1xBet 18.5
1.58
08.10. 00:201.58+0.03
Opening odds
07.10. 13:211.55 
2.21
08.10. 00:202.21-0.06
Opening odds
07.10. 13:212.27 
 Betway 18.5
1.55
07.10. 21:171.55+0.05
Opening odds
07.10. 13:191.50 
2.30
07.10. 21:172.30-0.10
Opening odds
07.10. 13:192.40 
 ComeOn 18.5
1.55
2.35
Average odds 18.5
1.56
2.29
Over/Under 19 games
Total Over Under
 1xBet 19
1.68
08.10. 00:201.68+0.04
Opening odds
07.10. 13:211.64 
2.07
08.10. 00:202.07-0.06
Opening odds
07.10. 13:212.13 
 Pinnacle 19
1.69
08.10. 01:331.69+0.01
Opening odds
07.10. 13:161.68 
2.21
Average odds 19
1.69
2.14
Over/Under 19.5 games
Total Over Under
 1xBet 19.5
1.82
08.10. 00:241.82+0.04
Opening odds
07.10. 13:211.78 
1.91
08.10. 00:241.91-0.04
Opening odds
07.10. 13:211.95 
 Betsafe 19.5
1.78
08.10. 00:021.78+0.03
Opening odds
07.10. 13:181.75 
1.92
08.10. 00:021.92-0.03
Opening odds
07.10. 13:181.95 
 Betsson 19.5
1.78
08.10. 00:031.78+0.03
Opening odds
07.10. 13:191.75 
1.92
08.10. 00:031.92-0.03
Opening odds
07.10. 13:191.95 
 Betway 19.5
1.73
2.00
 ComeOn 19.5
1.80
07.10. 20:071.80+0.04
Opening odds
07.10. 13:271.76 
1.95
 Pinnacle 19.5
1.83
08.10. 01:331.83+0.01
Opening odds
07.10. 13:161.82 
2.01
 Unibet 19.5
1.79
1.97
Average odds 19.5
1.79
1.95
Over/Under 20 games
Total Over Under
 1xBet 20
1.91
08.10. 00:201.91+0.04
Opening odds
07.10. 13:211.87 
1.80
08.10. 00:201.80-0.04
Opening odds
07.10. 13:211.84 
 Pinnacle 20
1.95
08.10. 01:331.95+0.01
Opening odds
07.10. 13:161.94 
1.88
Average odds 20
1.93
1.84
Over/Under 20.5 games
Total Over Under
 1xBet 20.5
2.03
08.10. 03:012.03+0.05
Opening odds
07.10. 13:241.98 
1.69
08.10. 03:011.69-0.04
Opening odds
07.10. 13:241.73 
 Betway 20.5
2.00
08.10. 01:042.00+0.10
Opening odds
07.10. 13:191.90 
1.73
08.10. 01:041.73-0.07
Opening odds
07.10. 13:191.80 
 bwin 20.5
2.00
08.10. 00:192.00+0.05
Opening odds
07.10. 13:221.95 
1.72
08.10. 00:191.72-0.03
Opening odds
07.10. 13:221.75 
 ComeOn 20.5
2.05
1.74
 Coral 20.5
2.00
08.10. 00:192.00+0.05
Opening odds
07.10. 13:311.95 
1.73
08.10. 00:191.73-0.02
Opening odds
07.10. 13:311.75 
 Ladbrokes 20.5
2.00
08.10. 00:192.00+0.05
Opening odds
07.10. 13:311.95 
1.73
08.10. 00:191.73-0.02
Opening odds
07.10. 13:311.75 
 Pinnacle 20.5
2.09
08.10. 01:332.09+0.02
Opening odds
07.10. 13:162.07 
1.77
Average odds 20.5
2.02
1.73
Over/Under 21 games
Total Over Under
 Pinnacle 21
2.22
08.10. 01:332.22+0.02
Opening odds
07.10. 13:162.20 
1.69
08.10. 01:331.69+0.01
Opening odds
07.10. 13:161.68 
Average odds 21
2.22
1.69
Over/Under 21.5 games
Total Over Under
 Betway 21.5
2.20
1.60
 ComeOn 21.5
2.25
1.60
Average odds 21.5
2.23
1.60
Over/Under 22.5 games
Total Over Under
 Betway 22.5
2.40
08.10. 00:152.40+0.10
Opening odds
07.10. 13:192.30 
1.50
08.10. 00:151.50-0.05
Opening odds
07.10. 13:191.55 
 ComeOn 22.5
2.60
1.45
Average odds 22.5
2.50
1.48
Over/Under 23.5 games
Total Over Under
 ComeOn 23.5
2.85
1.38
Average odds 23.5
2.85
1.38
Over/Under 24.5 games
Total Over Under
 ComeOn 24.5
3.00
1.35
Average odds 24.5
3.00
1.35
Asian Handicap -1.5 sets
Handicap Hartono Arianne Khromacheva Irina
 1xBet -1.5
1.72
08.10. 03:011.72-0.06
Opening odds
07.10. 13:241.78 
2.00
08.10. 03:012.00+0.07
Opening odds
07.10. 13:241.93 
 Betsafe -1.5
1.60
08.10. 00:021.60-0.08
Opening odds
07.10. 13:201.68 
2.10
08.10. 00:022.10+0.10
Opening odds
07.10. 13:202.00 
 Betsson -1.5
1.60
08.10. 00:031.60-0.08
Opening odds
07.10. 13:191.68 
2.10
08.10. 00:032.10+0.10
Opening odds
07.10. 13:192.00 
 BetVictor -1.5
1.60
2.25
 bwin -1.5
1.62
08.10. 00:191.62-0.29
Opening odds
07.10. 11:461.91 
2.15
08.10. 00:192.15+0.35
Opening odds
07.10. 11:461.80 
 Coral -1.5
1.61
08.10. 00:191.61-0.30
Opening odds
07.10. 11:511.91 
2.15
08.10. 00:192.15+0.35
Opening odds
07.10. 11:511.80 
 Interwetten -1.5
1.65
08.10. 00:191.65-0.05
Opening odds
07.10. 13:551.70 
2.10
08.10. 00:192.10+0.05
Opening odds
07.10. 13:552.05 
 Ladbrokes -1.5
1.61
08.10. 00:191.61-0.30
Opening odds
07.10. 11:511.91 
2.15
08.10. 00:192.15+0.35
Opening odds
07.10. 11:511.80 
 Pinnacle -1.5
1.66
08.10. 01:331.66-0.03
Opening odds
07.10. 13:181.69 
2.27
08.10. 01:332.27+0.07
Opening odds
07.10. 13:182.20 
 Unibet -1.5
1.74
2.05
Average odds -1.5
1.64
2.13
Asian Handicap -1 sets
Handicap Hartono Arianne Khromacheva Irina
 1xBet -1
1.34
08.10. 02:531.34-0.06
Opening odds
07.10. 13:211.40 
2.98
08.10. 02:532.98+0.26
Opening odds
07.10. 13:212.72 
Average odds -1
1.34
2.98
Asian Handicap 1.5 set
Handicap Hartono Arianne Khromacheva Irina
 Betsafe 1.5
1.05
08.10. 01:051.05-0.02
Opening odds
07.10. 13:201.07 
7.00
08.10. 00:067.00+0.70
Opening odds
07.10. 13:206.30 
 Betsson 1.5
1.05
08.10. 01:041.05-0.02
Opening odds
07.10. 13:191.07 
7.00
08.10. 00:067.00+0.70
Opening odds
07.10. 13:196.30 
 bwin 1.5
1.07
08.10. 00:191.07-0.07
Opening odds
07.10. 11:461.14 
6.75
08.10. 00:196.75+1.75
Opening odds
07.10. 11:465.00 
 Coral 1.5
1.08
08.10. 00:191.08-0.07
Opening odds
07.10. 11:511.15 
7.50
08.10. 00:197.50+2.25
Opening odds
07.10. 11:515.25 
 Interwetten 1.5
1.10
6.00
 Ladbrokes 1.5
1.08
08.10. 00:191.08-0.07
Opening odds
07.10. 11:511.15 
7.50
08.10. 00:197.50+2.25
Opening odds
07.10. 11:515.25 
 Pinnacle 1.5
1.08
08.10. 00:051.08-0.01
Opening odds
07.10. 13:181.09 
8.90
08.10. 01:338.90+1.08
Opening odds
07.10. 13:187.82 
 Unibet 1.5
1.11
7.00
Average odds 1.5
1.08
7.21
Asian Handicap -7.5 games
Handicap Hartono Arianne Khromacheva Irina
 1xBet -7.5
3.88
08.10. 03:013.88-0.04
Opening odds
08.10. 00:203.92 
1.20
08.10. 02:531.20+0.01
Opening odds
08.10. 00:201.19 
Average odds -7.5
3.88
1.20
Asian Handicap -7 games
Handicap Hartono Arianne Khromacheva Irina
 1xBet -7
3.44
08.10. 02:533.44-0.08
Opening odds
08.10. 00:203.52 
1.25
08.10. 02:531.25+0.01
Opening odds
08.10. 00:201.24 
Average odds -7
3.44
1.25
Asian Handicap -6.5 games
Handicap Hartono Arianne Khromacheva Irina
 1xBet -6.5
2.66
08.10. 00:202.66-0.13
Opening odds
07.10. 13:212.79 
1.41
08.10. 00:201.41+0.05
Opening odds
07.10. 13:211.36 
 ComeOn -6.5
3.10
1.33
Average odds -6.5
2.88
1.37
Asian Handicap -6 games
Handicap Hartono Arianne Khromacheva Irina
 1xBet -6
2.38
08.10. 03:012.38-0.11
Opening odds
07.10. 13:242.49 
1.52
08.10. 03:011.52+0.07
Opening odds
07.10. 13:241.45 
 Pinnacle -6
2.53
08.10. 01:332.53-0.06
Opening odds
07.10. 13:162.59 
1.54
08.10. 01:331.54+0.03
Opening odds
07.10. 13:161.51 
Average odds -6
2.46
1.53
Asian Handicap -5.5 games
Handicap Hartono Arianne Khromacheva Irina
 1xBet -5.5
2.04
08.10. 00:542.04-0.07
Opening odds
07.10. 13:242.11 
1.72
08.10. 00:541.72+0.08
Opening odds
07.10. 13:241.64 
 Betsafe -5.5
2.05
1.70
 Betsson -5.5
2.05
1.70
 ComeOn -5.5
2.05
1.71
 Pinnacle -5.5
2.12
08.10. 01:332.12-0.04
Opening odds
07.10. 13:162.16 
1.75
08.10. 01:331.75+0.04
Opening odds
07.10. 13:161.71 
Average odds -5.5
2.06
1.72
Asian Handicap -5 games
Handicap Hartono Arianne Khromacheva Irina
 1xBet -5
1.83
08.10. 03:011.83-0.09
Opening odds
07.10. 13:211.92 
1.88
08.10. 03:011.88+0.09
Opening odds
07.10. 13:211.79 
 Pinnacle -5
1.89
08.10. 01:331.89-0.04
Opening odds
07.10. 13:161.93 
1.94
08.10. 01:331.94+0.06
Opening odds
07.10. 13:161.88 
Average odds -5
1.86
1.91
Asian Handicap -4.5 games
Handicap Hartono Arianne Khromacheva Irina
 1xBet -4.5
1.67
08.10. 00:241.67-0.09
Opening odds
07.10. 13:211.76 
2.06
08.10. 00:242.06+0.08
Opening odds
07.10. 13:211.98 
 Betsafe -4.5
1.70
2.05
 Betsson -4.5
1.70
2.05
 ComeOn -4.5
1.74
2.05
 Pinnacle -4.5
1.71
08.10. 00:321.71-0.04
Opening odds
07.10. 13:161.75 
2.17
08.10. 01:332.17+0.07
Opening odds
07.10. 13:162.10 
 Unibet -4.5
1.71
2.08
Average odds -4.5
1.70
2.10
Asian Handicap -4 games
Handicap Hartono Arianne Khromacheva Irina
 1xBet -4
1.53
08.10. 00:201.53-0.08
Opening odds
07.10. 13:241.61 
2.29
08.10. 00:242.29+0.11
Opening odds
07.10. 13:242.18 
 Pinnacle -4
1.56
08.10. 01:331.56-0.04
Opening odds
07.10. 13:161.60 
2.48
08.10. 01:332.48+0.11
Opening odds
07.10. 13:162.37 
Average odds -4
1.55
2.39
Asian Handicap -3.5 games
Handicap Hartono Arianne Khromacheva Irina
 1xBet -3.5
1.45
08.10. 02:531.45-0.07
Opening odds
07.10. 13:211.52 
2.48
08.10. 02:532.48+0.14
Opening odds
07.10. 13:212.34 
 ComeOn -3.5
1.45
2.60
Average odds -3.5
1.45
2.54
Asian Handicap -3 games
Handicap Hartono Arianne Khromacheva Irina
 1xBet -3
1.40
2.65
Average odds -3
0
0
Asian Handicap -2.5 games
Handicap Hartono Arianne Khromacheva Irina
 1xBet -2.5
1.36
2.79
 ComeOn -2.5
1.34
3.00
Average odds -2.5
1.34
3.00
Asian Handicap -1.5 games
Handicap Hartono Arianne Khromacheva Irina
 ComeOn -1.5
1.26
3.50
Average odds -1.5
1.26
3.50
Asian Handicap -0.5 games
Handicap Hartono Arianne Khromacheva Irina
 ComeOn -0.5
1.23
3.85
Average odds -0.5
1.23
3.85
Correct Score 2:0
Result  
 BetVictor 2:0
1.70
08.10. 02:591.70-0.25
Opening odds
07.10. 11:321.95 
 Betway 2:0
1.60
08.10. 00:051.60-0.30
Opening odds
07.10. 12:121.90 
 bwin 2:0
1.62
08.10. 00:191.62-0.29
Opening odds
07.10. 11:461.91 
 Coral 2:0
1.65
08.10. 00:191.65-0.30
Opening odds
07.10. 11:511.95 
 Interwetten 2:0
1.65
08.10. 00:191.65-0.05
Opening odds
07.10. 13:551.70 
 Ladbrokes 2:0
1.65
08.10. 00:191.65-0.30
Opening odds
07.10. 11:511.95 
 William Hill 2:0
1.80
Average odds 2:0
1.67
Correct Score 2:1
Result  
 BetVictor 2:1
4.00
08.10. 02:454.00+0.25
Opening odds
07.10. 11:323.75 
 Betway 2:1
4.00
 bwin 2:1
4.10
08.10. 00:194.10+0.10
Opening odds
07.10. 11:464.00 
 Coral 2:1
4.20
08.10. 00:194.20+0.20
Opening odds
07.10. 11:514.00 
 Interwetten 2:1
4.10
08.10. 00:194.10+0.10
Opening odds
07.10. 13:554.00 
 Ladbrokes 2:1
4.20
08.10. 00:194.20+0.20
Opening odds
07.10. 11:514.00 
 William Hill 2:1
3.80
08.10. 02:043.80+0.05
Opening odds
07.10. 13:493.75 
Average odds 2:1
4.06
Correct Score 0:2
Result  
 BetVictor 0:2
6.50
08.10. 02:596.50+1.00
Opening odds
07.10. 11:325.50 
 Betway 0:2
7.00
08.10. 00:077.00+1.75
Opening odds
07.10. 12:125.25 
 bwin 0:2
6.75
08.10. 00:196.75+1.75
Opening odds
07.10. 11:465.00 
 Coral 0:2
7.00
08.10. 00:197.00+2.00
Opening odds
07.10. 11:515.00 
 Interwetten 0:2
6.50
08.10. 00:196.50+0.25
Opening odds
07.10. 13:556.25 
 Ladbrokes 0:2
7.00
08.10. 00:197.00+2.00
Opening odds
07.10. 11:515.00 
 William Hill 0:2
6.50
Average odds 0:2
6.75
Correct Score 1:2
Result  
 BetVictor 1:2
7.00
08.10. 02:597.00+1.50
Opening odds
07.10. 11:325.50 
 Betway 1:2
7.00
07.10. 21:177.00+1.25
Opening odds
07.10. 12:125.75 
 bwin 1:2
7.75
08.10. 00:197.75+1.75
Opening odds
07.10. 11:466.00 
 Coral 1:2
8.00
08.10. 00:198.00+2.00
Opening odds
07.10. 11:516.00 
 Interwetten 1:2
8.25
08.10. 00:178.25+0.25
Opening odds
07.10. 13:558.00 
 Ladbrokes 1:2
8.00
08.10. 00:198.00+2.00
Opening odds
07.10. 11:516.00 
 William Hill 1:2
7.00
08.10. 02:047.00+0.50
Opening odds
07.10. 13:496.50 
Average odds 1:2
7.57
 

Latest matches

  • Hartono
Chennai WTA, 1R, 29.10.2025
  Garland - Hartono 2:0
Chennai WTA, Q-QF, 26.10.2025
  Hartono - Nugroho 2:0
Chennai WTA, Q-R16, 25.10.2025
  Hartono - Lansere 2:0
Jinan, R16, 15.10.2025
  Sun - Hartono 2:0
Jinan, 1R, 14.10.2025
  Hartono - Li 2:0
Suzhou, Q-QF, 28.09.2025
  Dolehide - Hartono 2:0
Suzhou, Q-R16, 27.09.2025
  Hartono - Osuigwe 1:0
Jingshan, 1R, 22.09.2025
  Ma - Hartono 2:1
Sao Paulo WTA, 1R, 08.09.2025
  Sierra - Hartono 2:0
Guadalajara WTA, 1R, 02.09.2025
  Eala - Hartono 2:0
 
  • Khromacheva
Cluj-Napoca 2 WTA, Q-R16, 04.02.2024
  Andreeva - Khromacheva 1:0
Cluj-Napoca 2 WTA, Q-1R, 03.02.2024
  Khromacheva - Szabo 2:0
Hobart, Q-1R, 06.01.2024
  Bai - Khromacheva 2:0
Seoul WTA, 1R, 09.10.2023
  Von Deichmann - Khromacheva 1:0
Seoul WTA, Q-QF, 08.10.2023
  Hartono - Khromacheva 2:0
Seoul WTA, Q-R16, 07.10.2023
  Khromacheva - Kim 2:0
Parma, Q-QF, 17.09.2023
  Kawa - Khromacheva 2:0
Chicago WTA, 1R, 22.08.2023
  Brengle - Khromacheva 2:0
Chicago WTA, Q-QF, 21.08.2023
  Khromacheva - Matz 2:0
Barranquilla, Q-QF, 13.08.2023
  Lepchenko - Khromacheva 2:0
 
 
 
 
TOPlist