Ten pins, numbered 1 through 10. The numbering system is the language that bowlers, coaches, and scoring systems use to communicate about what's happening on the lane. When a commentator says "the bowler left a 7-10 split," when a coach tells you "you're leaving the 10-pin high," or when a scoring app shows you're on the 4-6-7-9-10, they're all using the same pin numbering system that has been standard in ten-pin bowling for over a century.
The Pin Layout
The 10 pins are arranged in a 4-3-2-1 triangle. Pin 1 — the headpin — is at the front, closest to the bowler. Rows go backward from there, numbered left to right within each row:
Each Pin and Its Role
Pin 1 (Headpin): The front pin. Hit correctly, it initiates the chain reaction of a strike. For right-handed bowlers, the ideal ball entry is between pins 1 and 3 (the 1-3 pocket). For left-handers, between pins 1 and 2 (the 1-2 pocket).
Pins 2 and 3: The second row. Pin 2 is left of the headpin; pin 3 is to the right. A ball entering the 1-3 pocket should deflect into the 5-pin via the 3-pin. Pin 2 is the target for left-handed bowlers' pocket entry.
Pins 4, 5, 6: The middle row. The 5-pin (center of the rack) is called the "king pin" — the most important pin for strike carry. When a ball hits the 1-3 pocket properly, the 3-pin takes out the 6-pin and the 5-pin, and the 5-pin takes out the 8 and 9. The 5-pin left standing usually means a light pocket hit.
Pins 7, 8, 9, 10: The back row. The corner pins — 7 (far left) and 10 (far right) — are the hardest single-pin spares. The 8 and 9 are called the "sleeper" pins because they hide behind the 2 and 3 pins respectively on the initial view of the rack.
Common Spare Leaves by Pin Number
| Leave | Pins | Cause (right-hander) |
|---|---|---|
| Single 10-pin | 10 | Hit too high on headpin (light pocket) |
| Single 7-pin | 7 | Hit too light on the 1-2 side, or very high pocket |
| Baby split | 2-7 | Deflected off headpin left of the 2-pin |
| 7-10 split | 7-10 | Ball through the middle of the rack, missed the 5 |
| 6-7-10 | 6-7-10 | Very high/solid headpin hit |
| 5-pin | 5 | Light hit — ball missed the 5-pin |