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Horse profile

Thermusa (GB)

5yo mare (at last run, Nov 2022) · Last trainer Ruth Jefferson · Last owner They Are Never At Home Partnership
by Kayf Tara (GB) out of Persian Forest (GB) (Presenting)
2 runs · 1 course · from Oct 2022
As at 28 Oct 2026 · KTB archive: GB, Ireland & France · 2005–present, updated daily
No run recorded since 3 Nov 2022 — 1,455 days ago. Our archive can't say whether the horse is still in training.
Last run Nov 2022 Won at Sedgefield Beaten favourite LTO
KTB Profile

Thermusa won the Class 4 MGL Demolition Mares Novices Hurdle at Sedgefield on good to soft in Oct 2022 and finished second in the Class 4 Stanley and Lillian Thompson Memorial Mares Novices Hurdle at the same track the following month when beaten favourite. The Kayf Tara mare had two starts on turf between Oct 2022 and Nov 2022 both over 2m1f to 2m4f. Her dam produced nine runners including Restandbethankful with seven wins.

Based on 2 archived runs · updated 28 Oct 2026
KTB at a glance Win at Class 4

KTB Speed and Rating

KTB Speed

Best recent Speed — no A or B graded figure in the last 3 runs; the figures below carry grade C

How fast the horse ran, as points against the day-corrected standard time for its course and distance: 100 is the median GB Class 4 handicap winner on that code; one point is 0.1% of the standard time. A, B or C is how much the day's card could tell us, not how good the run was. What this means →

Jumps 1 figure · too few for a breakdown

Of 2 runs looked at, 1 has no figure: did not complete (1).

KTB Speed v1 · batch 15 Sep 2026 · GB & Irish racing only · 1 figure from 2 runs · as at 3 Oct 2026 · a record, not a forecast

KTB Rating

Best recent KTB Rating 111B the best of the last 1 rated run · Sedgefield, 5 Oct 2022

What the horse achieved in each race, in pounds on the official-rating scale, from the weight carried, the lengths beaten and the race's own level solved across the archive — never the market, never the official rating as a starting point. The headline is the best of the horse's last three rated runs on that code. A, B or C on a run is how much known form was in that race. What this means →

Jumps 1 figure · too few for a breakdown

Of 2 runs looked at, 1 has no figure: did not complete (or a non-runner row) (1).

KTB Rating v1 · batch 3 Oct 2026 · GB & Irish racing only · 1 figure from 2 runs · as at 4 Oct 2026 · a record, not a forecast

Both figures are KTB's own, computed from the archive; no vendor rating enters either. Every run's figure is on its form line below with its grade. Grades measure how much the archive could see, never the merit of the run.

Run style is derived from in-running commentary, which our data provider does not supply for this horse's races.

Pedigree intelligence

Sire
Kayf Tara (GB)

Progeny in our archive have won 12.6% of 13,744 runs since Jan 2008 (1,148 horses).

Strongest on heavy going: 16.2% from 1,708.

GoingRunsWinsSRvs sireThis horse
Firm1300%−12.6—
Good to Firm5296011.3%−1.3—
Good4,49252411.7%−0.9—
Good to Soft3,04935911.8%−0.81 from 1
Soft3,76049313.1%+0.50 from 1
Heavy1,70827716.2%+3.6—
Standard (AW)1932412.4%−0.2—
Distance (all codes)RunsWinsSRvs sireThis horse
6f – 7f200%−12.6—
1m – 1m1f2400%−12.6—
1m2f – 1m4f1631811%−1.6—
1m5f – 2m3,97652113.1%+0.5—
2m1f – 2m4f4,75959312.5%−0.11 from 2
2m5f – 3m3,81647912.6%0—
Over 3m1,00412612.5%−0.1—

Flat and jumps together (all codes) · since Jan 2008 · as at 28 Oct 2026 · rows under 30 runs muted · win % is the measure, a record not a forecast

Dam
Persian Forest (GB) (Presenting)

9 siblings in the archive, 3 winners — best of them Restandbethankful (GB) (7 wins).

The wins came over 1m7½f–2m3f; the highest grade won is Class 2 (Persian Time (GB)).

ProduceRunsWinsWin tripsBest grade
Restandbethankful (GB)5672m–2m3fClass 3
Persian Time (GB)1431m7½f–2m2fClass 2
Little Jack (GB)1412m1½fClass 5
Don't Tell Dougie (GB)20——
Miss Ocean (GB)10——
Talysh (GB)70——
Persian Willow (GB)30——
Franchel (GB)10——
Honour Me (GB)10——

Too few runs for meaningful splits. The full record is below.

Form

DateCourseRace PosBtn Wgt SpdKTB Jockey SP
2022 · 2 runs
03 Nov 22+29d Sedgefield Stanley & Lillian Thompson Memorial Mares' Novices' Hurdle (GBB Race) Class 4 · 20f · Soft · 5 ran PU/5 — 11-7 —— Brian Hughes 4/5F
05 Oct 22 Sedgefield MGL Demolition Mares' Novices' Hurdle (GBB Race) Class 4 · 20f · Good To Soft · 5 ran 1/5 11-0 112C111B Brian Hughes 8/11F

Quick answers

How many races has Thermusa won?
Thermusa (GB) won 1 of 2 archived starts in 2022, a strike rate of 50%. Placed 1 time in total (50% of starts).
Who trained Thermusa?
Thermusa (GB) was trained by Ruth Jefferson on the most recent run on record, at Sedgefield on 3 November 2022.
Who is Thermusa's sire?
Thermusa (GB) is by Kayf Tara (GB) out of Persian Forest (GB), whose sire is Presenting.
What is Thermusa's sire's record?
Kayf Tara (GB)'s progeny in our archive have won 12.6% of 13,744 runs since Jan 2008 (1,148 horses), Flat and jumps together. Strongest on heavy going: 16.2% from 1,708.
Who are Thermusa's siblings?
Out of Persian Forest (GB), Thermusa (GB) has 9 other produce in our archive, 3 of them winners. Most wins: Restandbethankful (GB) (7). Highest grade won: Class 2 (Persian Time (GB)). The wins came over 1m7½f–2m3f. As at Oct 2026.

Record shown from October 2022. Our archive holds racing in Great Britain, Ireland and France from January 2005. Runs in other countries are not in it, and earlier runs are not available from our data provider. In-running comments are available from 2024 onward.