Separate aim, spin at impact, speed and timing with practical comparisons. Learn what a simulation can show and what must be checked on the table.
Map the tip position before predicting the route
Squirt, swerve and cushion response still depend on cue, speed, cloth and delivery.
A repeatable stroke, then a diagnosis
Choose a comfortable stance and stable bridge that let the cue travel along the intended line. Repeat one simple centre-ball shot and record where the ball actually travels. A miss may come from alignment, unintended tip offset, speed or an incorrect route assumption; do not diagnose every miss as a crooked stroke. Change one condition at a time.
Tip position is not the impact state
A low hit starts backspin, but cloth friction can reduce it before the object ball. A centre-height hit can acquire forward roll while travelling. Stun means little forward or backward rotation at object-ball impact, not simply selecting the centre of a tip diagram. For a square collision it can produce a stop; a cut collision sends the cue ball sideways. Side spin also affects aiming and cushion rebound.
Speed has more than one effect
Compare three speeds from an unchanged layout, aim and tip setting. Note the first cushion contact, later arrival and remaining travel. Do not assume that harder always means a longer angle: sliding or rolling state, side spin, cushion response and cloth all interact. A system reference is useful only with its stated stroke conditions and a check on the actual table.
A kiss is a timing problem too
Follow the first object ball alongside the cue ball. Two plotted lines can cross safely at different times; nearby lines can still collide because balls have width. Changing thickness or speed may remove one kiss but create another. Replay the complete path rather than judging only the intended scoring contact.
Elevated strokes are a separate skill
A raised cue can produce swerve or a massé. Curve depends on cue direction, elevation, contact point, speed and cloth; it is not controlled by elevation alone. Start with level-cue routes and learn advanced strokes with appropriate instruction and the table owner’s permission. A simulated curve does not demonstrate that a risky real stroke is safe for the cloth.
Turn comparison into a useful session
Use one saved layout. First vary only speed; next restore the baseline and vary only tip height; finally compare a different first-ball thickness. Record what changed and what did not, including misses. The simulator isolates inputs and helps inspect paths, but it does not measure your personal stroke or calibrate a physical table. Confirm the observation with repeatable real-table attempts.