THE DREYER TRAINER

Welcome

The Dreyer Trainer

The Robin Dreyer pool method, made interactive — read the exact tip placement for any stop shot, see where to aim, and work a shot from cut angle to speed to spin.
Choose a tool
STOP
Stop-Shot Finder
Speed + distance → exactly where to strike below center, drawn to scale.
›
Aim Reference
Ball fraction → cut angle, speed transfer, and the spot to aim on the object ball.
›
8
A-S-S · Angle → Speed → Spin
Work a full position shot: cut, distances, then where you want the cue ball to go.
›

Stop-Shot Finder

Speed2.5
Distance CB→OB2
6.8 mm
9/32″ below center · ½ tip
strike below center
Where to strike the cue ball for a dead stop on a full, straight hit. Red ring = miscue limit.

Aim Reference — spot on the object ball

Pick how much of the object ball you're hitting. Sight through the center of the (see-through) cue ball to the marked spot on the object ball.

Aim CB center at the object-ball center
Cut angle
30°
Thickness
Half
Speed → OB
50%
Stays on CB
50%
The blue dot is the cue-ball center — line your tip up so that, looking through the cue ball, it covers the marked spot on the object ball. Thinner hit → the spot moves toward (and past) the edge.

A-S-S · Angle → Speed → Spin

ACut angle (ball fraction)
Thick = under 30° (+0.5 speed) · Thin = over 30° (−0.5) · 30° = neutral.
SDistances (diamonds)
CB → OB separationadded to the total only when ≥ 3
2
CB travel wantedafter it hits the object ball
6
Speed 1
recommended stroke speed
SSpin — how high or low to hit

Two linked views. Point at where you want the cue ball to go relative to the tangent, then read where to strike it. The fan shows how much you can deviate for this cut — it narrows for thinner cuts.

① WHERE YOU WANT THE CUE BALL TO GO
◀ DrawTangentFollow ▶
② WHERE TO STRIKE THE CUE BALL
Deviation off tangent
0°
Range this cut
±30°
Tip height
at stop
Stop point
–6.8 mm
Beta — A-S-S speed & spin follow your rules but the source method is loose. Verify at the table and tell me what to tune.
Interactive companion to the Robin Dreyer pool method · working draft built by Dr. Joe Germano
Diagrams © Robin Dreyer · calculated values to be verified at the table