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Trainer profile

B Bossert

107 runners in the lifetime window · 24 individual horses
As at 1 Nov 2026 · KTB archive: 2005–present, updated daily
Last runner 11 days ago 100% of runners on the flat
Last 5 seasons Lifetime (2009→)
from 1 Jan 2008 — the aggregate floor: every horse in the window has a complete captured career behind it
5–107
Wins / Runs
4.7%
Strike rate
n=107
27 (25%)
Placed
0.94
Fair A/E
n=104 · 0.78 incl. margin
−44.80
£1 level stake
n=104 at SP · −43.1%
£103k
Prize money (window)
Strike by season
7.1%
KTB Yard Profile

Sends out around 10 runners a season, almost all on the flat, winning with 5% of them — a touch below the margin-free market read across the lifetime window (Fair A/E 0.94).

Deterministic profile computed from 107 archived runs (lifetime window) · updated 1 Nov 2026
KTB at a glance Fresh horses: 4.8%
The read

The record reads poorly over 1m2f – 1m4f — 0% over 42 runners, 4.7pts below the baseline. The market has consistently overbet the yard on Standard (AW) going: Fair A/E 0.59 across 71 runners (2.8% strike, −28.90 to a £1 stake) — runners there underperform what the price implies.

Written from the figures on this page — every claim carries its sample. Descriptive, not a tip.

Yard patterns

the angles behind the record · vs 4.7% baseline
Fresh · 61+ days off
4.8%+0.1
n=42 · A/E 1.18 · £1 +2.10
New recruits · first run for the yard
0%−4.7
n=14 · A/E 0.00 · £1 −14.00
Debutants · first career start
0%−4.7
n=11 · A/E 0.00 · £1 −10.00
First-time headgear · true-first definition
0%−4.7
n=9 · A/E 0.00 · £1 −9.00
Headgear returns · back on after a bare run
0%−4.7
n=2 · A/E 0.00 · £1 −2.00
When favourite
50%
n=2 · A/E 2.74 · £1 +2.30
Claiming riders · a claimer in the saddle
0%−4.7
n=23 · A/E 0.00 · £1 −22.00

Each tile is the record in that situation vs the 4.7% baseline — descriptive splits with the sample always shown, for you to weigh. Tiles under 30 runs render muted. Headgear figures use the true-first definition (first gear appearance in the captured career); returns are gear back on after a bare run. Claiming riders are runs where the booked rider carried a weight claim. Group / Graded covers pattern and listed races. The same beliefs, tested across every yard and every GB and Irish race since 2005: Racing myths.

Notable angles

vs their own baseline
Over 1m2f – 1m4f 0% vs 4.7% · n=42
At Deauville (FR) 2% vs 4.7% · n=51
On Standard (AW) going 2.8% vs 4.7% · n=71 · A/E 0.59
With a new jockey booking 5.8% vs 4.7% · n=52 · A/E 1.42
Descriptive splits ranked by divergence × sample — insight, not instruction. Every angle carries its N; nothing under 30 runs qualifies. Rows within 2pts of the baseline appear only when the market-relative read (Fair A/E) diverges, and show it.

Record by conditions

same window as header

Going

GoingRWSR£1
Standard (AW) 71 2 2.8% −28.90
Good to Soft 14 1 7.1% −7.70
Good 13 2 15.4% −0.20
Soft 7 0 0% −6.00
Heavy 2 0 0% −2.00

Courses

CourseRWSR£1
Deauville (FR) 51 1 2% −34.90
Chantilly (FR) 27 1 3.7% +0.00
Saint-Cloud 8 1 12.5% −2.20
Maisons-Laffitte (FR) 6 0 0% −6.00
Strasbourg (FR) 4 0 0% −2.00
Longchamp (FR) 4 1 25% +0.30
Lyon Parilly (FR) 3 0 0% −3.00
Vichy (FR) 2 0 0% −2.00
Moulins (FR) 1 0 0% −1.00
Le Touquet (FR) 1 1 100% +6.00

Class

ClassRWSR£1
Class 4 3 1 33.3% +4.00

Market position

In the bettingRWSRA/E£1
Favourite 3 1 33.3% 1.93 +1.30
2nd–3rd fav 7 2 28.6% 2.31 +5.80
4th–6th fav 15 0 0% 0.00 −15.00
7th+ in betting 79 2 2.5% 0.79 −36.90
Fair A/E per band is the tell: near 1.00 the market had it priced right; well above, the wins came where the market didn't expect them.

Rows below n=30 are shown faded — a small sample is a fact, not a trend. Every figure carries its N.

Horses trained

same window as header · most-raced first
HorseRWPlLast ran
Grey Belle (FR)from Francois Monfort 26 2 6 21 Oct 26
Garigliano (FR)from Francois Monfort 15 2 5 22 Jan 26
Square Set (FR)from C Boutin 11 0 3 5 Jul 20
Speedywell (FR) 9 0 4 2 Apr 21
Private (GB)from P Adda 8 0 2 7 Mar 17
Skyler White (GB)from J Reynier 5 0 0 6 Oct 20
April Step (FR)from M Rulec 4 0 0 22 Dec 23
Lundy Island (GB) 4 0 0 12 Mar 15
Heart Trouble (FR) 4 1 4 2 Sep 13
Money Humor (IRE) 3 0 1 21 Mar 14
Anna Caribea (FR)from Mathieu Pitart 2 0 0 26 Nov 24
Dewi Sant (FR)from P Van De Poele 2 0 2 11 Aug 22
All 24 horses sent out in this window. Runs, wins and places only: a strike rate or a return on a handful of runs is noise, so none is quoted per horse — each horse's full record is on its own page.
Where they came from · where they went next

Of the 24 horses listed, 13 arrived from another yard in our archive, most often from Francois Monfort (2); 11 had their first archived run for this yard.

1 has since run for another yard; 23 have no later run for another yard in our archive.

Read from each listed horse's whole archived career (2005 onwards), not only this window, and counted over the horses listed above, not the whole string. “First archived run” means our archive holds nothing earlier, not that the horse was unraced. A horse with no later run elsewhere may still be here, be off the track, or have run somewhere our archive does not cover — none of that is asserted.

Current form

significance-gated

Last 14 days

Small sample
0 from 1
Only 1 runners in the last 14 days — too few to read against the baseline (gate: n≥15). The card states the sample and stays neutral.

When the yard fires

strike by month, lifetime
JFMAMJJASOND
0014017001413000
A flat yard: the season runs Mar–Oct. Muted months are small samples (under 30 runs) — read them with the caution they deserve.

Jockey bookings

same window · biggest samples first
RiderRWSR£1
Cyrille Stefan 23 0 0% −21.00
Clement Lecoeuvre 16 2 12.5% +15.30
Mme Frida Valle Skar 7 0 0% −7.00
Benjamin Marie 6 1 16.7% +9.10
Tony Piccone 5 0 0% −5.00
Mr Kevin Braye 4 0 0% −4.00
Thomas Messina 4 0 0% −4.00
Aurelien Lemaitre 3 0 0% −3.00
Alexandre Champenois 3 0 0% −3.00
Mme Laura Grosso 3 0 0% −2.00
Mme Perrine Cheyer 3 0 0% −3.00
Fabien Lefebvre 3 0 0% −3.00
Muted rows are under 30 rides.

Career highlights

lifetime archive, 2009→
5
Archived wins
£103k
Prize money
2022
Best season · 2 wins
Garigliano (FR) — Prix Mercedes-Benz Paris (Prix du Ruisseau des Sablons) (Handicap) (4yo+) (New Course: 2nd Post) Longchamp (FR) · May 2022
£7,983
Heart Trouble (FR) — Prix d'Aincourt (Handicap) (4yo+) (Amateur Riders) (Turf) Saint-Cloud (FR) · Sep 2013
£7,724
Grey Belle (FR) — Prix Hotel Regina Hardelot Le Touquet (FR) · Aug 2026 · Class 4
£7,700
Notable horses
Grey Belle (FR) Garigliano (FR) Heart Trouble (FR)

Sires in the string

progeny record · win % by ground and trip
Johnny Barnes (IRE) 7.7% · 2–26
Progeny have won 6.3% of 538 runs since 2008 (63 horses).
Gutaifan (IRE) 13.3% · 2–15
Progeny have won 8.9% of 3,762 runs since 2008 (302 horses).
Country Reel (USA) 0% · 0–11
Progeny have won 7.8% of 1,191 runs since 2008 (143 horses). Strongest over 1m5f – 2m (all codes): 13.4% from 149.
Willywell (FR) 0% · 0–9
Progeny have won 9.5% of 148 runs since 2008 (31 horses).
Pivotal (GB) 0% · 0–8
Progeny have won 13.6% of 12,789 runs since 2008 (1,019 horses). Weakest over 2m5f – 3m (all codes): 7.4% from 108.
Iffraaj (GB) 0% · 0–5
Progeny have won 10.5% of 13,978 runs since 2008 (1,092 horses).
Top line: the yard's own record with each sire's runners (win %, wins–runs), same window as the header; faded under 30 runs. Beneath it: every run by that sire's progeny in our archive since 2008, as at 1 Nov 2026 — what they have done, not a forecast. A going or a distance is named only where at least 100 progeny runs sit 3 or more points from the sire's own win rate. Distance bands cover Flat and jumps together.

The record

latest 50 of 107 · newest first

The latest 50 of 107 archived runners, newest first. The full record runs from 2 August 2009 to 21 October 2026.

DateCourseHorseRaceFinishSP
21 Oct 26 Deauville (FR) Grey Belle (FR)J: Giovanni Sias Prix De La Foret Du Rouvray7.5f · Standard · 13 ran 7th 22/1
20 Sep 26 Strasbourg (FR) Grey Belle (FR)J: Dorian Provost Prix Du Pmu Au Soleil A Molsheim (Prix Du Donon)7.5f · Good To Soft · 11 ran 11th 11/1
15 Sep 26 Lyon Parilly (FR) Grey Belle (FR)J: Mr Kevin Braye Prix Serge Maillard8f · Heavy · 11 ran 8th 20/1
28 Aug 26 Moulins (FR) Grey Belle (FR)J: Antoine Hamelin Prix D'avermesClass 4 · 7f · Soft · 12 ran 6th 10/1
16 Aug 26 Le Touquet (FR) Grey Belle (FR)J: Antoine Hamelin Prix Hotel Regina HardelotClass 4 · 6.5f · Good · 10 ran 1st 6/1
20 Jul 26 Vichy (FR) Grey Belle (FR)J: Clement Lecoeuvre Prix De LignieresClass 4 · 7f · Good To Soft · 16 ran 7th 15/2
05 Jul 26 Saint-Cloud Grey Belle (FR)J: Clement Lecoeuvre Prix Du Jardin De L'avre - World Pool By Pmu Handicap7f · Good · 14 ran 3rd 18/1
23 Apr 26 Longchamp (FR) Grey Belle (FR)J: Tony Piccone Prix de la Comedie Francaise (Handicap) (Turf)8f · Good To Soft · 15 ran 14th 42/1
08 Apr 26 Deauville (FR) Grey Belle (FR)J: Tony Piccone Prix du Raz Blanchard (Handicap) (All Weather) (Polytrack)7f · Standard · 12 ran 9th 25/1
26 Mar 26 Chantilly (FR) Grey Belle (FR)J: Tony Piccone Prix des Porcelaines Princieres (Handicap) (All Weather) (Polytrack)7f · Standard · 15 ran 5th 32/1
12 Mar 26 Chantilly (FR) Grey Belle (FR)J: Clement Lecoeuvre Prix Janus (Handicap) (All Weather) (Polytrack)8f · Standard · 15 ran 11th 33/1
30 Jan 26 Deauville (FR) Grey Belle (FR)J: Clement Lecoeuvre Prix du Centre Calamel (Handicap) (All Weather) (Polytrack)6.5f · Standard · 12 ran 5th 18/1
22 Jan 26 Deauville (FR) Garigliano (FR)J: Aurelien Lemaitre Prix de Veules-les-Roses (Handicap) (All Weather)12.5f · Standard · 16 ran 9th 23/1
08 Jan 26 Deauville (FR) Garigliano (FR)J: Aurelien Lemaitre Prix de l'Aure (Handicap) (5yo+) (All-Weather Track) (Polytrack)12.5f · Standard · 16 ran 3rd 26/1
22 Oct 25 Deauville (FR) Grey Belle (FR)J: Benjamin Marie Prix de la Foret du Rouvray (Handicap) (4yo+) (All-Weather Track) (Polytrack)7.5f · Standard · 15 ran 3rd 20/1
30 Sep 25 Chantilly (FR) Grey Belle (FR)J: Benjamin Marie Prix du Bois Bourillon (Handicap) (4yo+) (All-Weather Track) (Polytrack)8f · Standard · 16 ran 12th 55/1
17 Aug 25 Deauville (FR) Grey Belle (FR)J: Benjamin Marie The Aga Khan Studs Prix de Glanville (Handicap) (4yo+) (Round Course) (Turf)8f · Good To Soft · 16 ran 16th 20/1
16 Aug 25 Deauville (FR) Garigliano (FR)J: Clement Lecoeuvre Prix d'Auvillars (Handicap) (4yo+) (All-Weather Track) (Polytrack)12.5f · Slow · 16 ran 9th 40/1
05 Aug 25 Deauville (FR) Grey Belle (FR)J: Benjamin Marie Prix de la Villa Montebello (Handicap) (4yo+) (All-Weather Track) (Polytrack)7f · Slow · 13 ran 1st 141/10
10 Apr 25 Chantilly (FR) Grey Belle (FR)J: Clement Lecoeuvre Prix du Chemin des Clos (Handicap) (4yo+) (All-Weather Track) (Polytrack)7f · Standard · 12 ran 2nd 61/10

Drawn from the whole archive (2005 onwards), so it can include runs outside the window the header statistics cover. Non-runners are not listed. A finish shown in letters is a non-completion (F fell · UR unseated · PU pulled up · BD brought down).

Quick answers

What is B Bossert's strike rate?
B Bossert has won 5 of 107 runners since 2008, a strike rate of 4.7% (as at 1 November 2026). Figures are computed from our own results archive.
Which course does B Bossert do best at?
Deauville (FR) by strike rate: 1 wins from 51 runners (2%) since 2008. Read from the 15 courses with the most runners on the same basis, and only those with at least 30 — a small sample cannot top the list, and a rarely-visited course is not in the comparison.
Is B Bossert in form?
Too few runners in the last 14 days to read — 1 runner, which is not a sample we will draw a conclusion from.
What is B Bossert's Fair A/E?
0.94, from 104 runners with a computed fair probability since 2008. Fair A/E compares actual wins with a margin-stripped market expectation, so 1.00 is par: above it the wins came at bigger prices than the margin-free market implied, below it they did not.
Fair A/E compares wins with a margin-stripped market expectation. Favourite-heavy samples — top yards, leading riders — naturally read a few points warm, so 1.05 means "beat the margin-free market read", not "the market underrates this by 5%". Three sample sizes are reported and never blended: runs (n), the ROI basis (n at SP), and the fair-A/E basis (n with a computed fair probability).

Strike rate is wins over all runs (n). ROI is £1 level stakes at SP over runs with a parseable price (n at SP). Fair A/E is wins over margin-stripped market expectation, over runs with a computed fair probability (n fair). The three Ns can legitimately differ and are always shown. Figures as at 1 November 2026, computed from our own results archive (2005 onwards; aggregates from 2008).