Template:FMR drops explanation
After the Duel the player is awarded a skill; POW (power) or TEC (technical) and a ranking: S, A, B, C or D. Different cards are awarded, depending on the ranking. See Yu-Gi-Oh! Forbidden Memories § Spoils for how the rank is determined.
The chance of winning a card for a given ranking is indicated by the "%" (chance out of 100) and "2048th" (chance out of 2048) columns.