Easy difficulty hints, answers for Feb. 27 PipsEqual (6): Everything in this purple space must be equal to 6. The answer is 6-0, placed horizontally; 6-3, placed vertically.
The “Knocking on Wood” Wikipedia page mentions Roud’s conclusion, and this claim of a 19th century origin has circulated online as the final say on the matter. If you go back to the original, though, Roud’s proposal actually ends on an ambivalent note: “Before this theory [of 19th century origins] can be finally accepted, however, an examination of the history of European forms of this custom would be advisable.”
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Kotlin API — 适用于 Android 和 JVM（Linux、macOS、Windows）的完整 SDK