To put in context the surprise that greeted the two-day Boxing Day Test just gone, consider the rarity by arithmetic. The match in Melbourne was Test number 2,615, and was two-day Test number 27. You don't need a calculator to see that's roughly 1%. And yet we've had two such matches in the current Ashes series, plus another in Australia three years earlier. We've had half a dozen two-day Tests worldwide since 2021. What gives?