Our indoor venue at Buntingford only allows us to shoot fifteen yards, which isn’t enough for a Portsmouth. For that reason we’ve invented a round called a Plymouth (Dave’s idea.) It’s next door to a Portsmouth, fifteen yards instead of twenty, and 40 cm faces instead of 60 cm.
So ¾ of the distance and ⅔ of the target size would suggest it’s 1⅛ more difficult (¾ ÷ ⅔). However arrow diameter remains fixed and becomes more significant on smaller faces, so doing the handicap math it turns out that a Plymouth is only very slightly more difficult than a Portsmouth.
For that reason we’ve decided that we can equate a Plymouth with a Portsmouth in our records system and award handicaps and classifications indoors based on the tables for the Portsmouth. We’re ever so slightly under-classifying ourselves (by around 2 to 3 handicap points at most), but at least we can’t be accused of cheating, and can expect to score better than predicted in a real Portsmouth.
Plymouth vs. Portsmouth Score Comparison
The following tables and graphs show a comparison between predicted scores for the Portsmouth and the Plymouth, for handicaps from one hundred to zero in steps of ten. You can see that the predicted scores for a Portsmouth are (except for the very highest handicaps—an artefact of the handicap maths) slightly higher than the equivalent Plymouth.
Full Size Faces
| Handicap | Portsmouth | Plymouth | Difference |
|---|---|---|---|
| 100 | 34 | 39 | -5 |
| 90 | 93 | 92 | 1 |
| 80 | 195 | 181 | 14 |
| 70 | 315 | 293 | 22 |
| 60 | 416 | 396 | 20 |
| 50 | 484 | 470 | 14 |
| 40 | 530 | 521 | 9 |
| 30 | 562 | 556 | 6 |
| 20 | 583 | 580 | 3 |
| 10 | 596 | 594 | 2 |
| 0 | 600 | 599 | 1 |
As a Graph
Triple Spot Inner Ten Scoring
Handicap Portsmouth Plymouth Difference
100 17 19 -2
90 49 48 1
80 114 105 9
70 223 200 23
60 359 328 31
50 467 445 22
40 519 510 9
30 544 541 3
20 559 558 1
10 573 572 1
0 589 588 1