A Real Life Off-by-One Error
Analogies to Programming and Benchmarks
- Several commenters compare the standardized speed route to a benchmark or test harness, not production code.
- The misplaced hold is likened to a line of benchmark code that gets optimized away: unused in the current “fast path,” but still part of the spec and potentially relevant under different “architectures” (future climbers, new techniques).
- Others liken the unused hold to code with side effects: even if it’s not “touched,” it can affect behavior (visual cues, body positioning).
Did the Misplaced Hold Affect Results?
- Some note the article says top climbers no longer use that hold or another nearby one, so in theory it should not affect times.
- A separate belay rope issue on the right lane is suggested as a more likely cause of the left lane winning more often.
- Others argue unused holds can still act as visual landmarks or subconscious cues; even small disruptions matter when races are decided by hundredths of a second.
- Psychological effects (reduced trust in route fairness) are proposed as another possible factor; overall causality is considered unclear.
What Counts as an “Off-by-One” Error?
- Debate over whether this is “really” an off‑by‑one:
- Literal view: a hold is one grid unit off, so yes.
- Stricter view: off‑by‑one in spirit requires counting ambiguity (0 vs 1 start, inclusive vs exclusive, fencepost).
- Examples given: misinterpreting “11 holes apart,” plumbing distances, birthday/age counting conventions in various cultures.
Perception and Detection of the Error
- Multiple people report that crossing or relaxing their eyes to fuse the two lanes makes the wrong hold “pop out” in depth, similar to Magic Eye/autostereograms.
- Others struggle to see it even with stereoscopy, citing distraction from markings or eye-dominance issues.
- Suggestions include overlaying two photos or using simple computer vision / image editing; some note AI could also detect misplacements but is not strictly necessary.
Debate on Standardized Speed Climbing Wall
- Some find a fixed route “bizarre,” arguing it reduces problem‑solving and overemphasizes muscle memory.
- Others counter that many sports (track, field) use fixed configurations; speed climbing is explicitly about optimizing a known route.
- There is discussion of other climbing disciplines (bouldering, lead) having fresh routes each competition, and of ongoing debate about how often to change speed routes.
Other Real-Life Off-by-One Anecdotes
- Shared stories include:
- A college degree plan missing one class.
- A historical surrender document nearly botched by an off‑by‑one.
- A German town’s long‑term block pyramid that miscounts required blocks.
- A cryptographic key search client allegedly reporting a key offset by one.
- A short derivation of the formula for the sum of 1..N based on symmetric pairing and not double‑counting the middle term.