This form calculates the estimated changes in an ELO rating, for a single game, using the exact, not the approximate, USCF formulas. The rating is still estimated, though, because the USCF calculations consider an entire tournament at once, is done in two passes and
requires the complete tournament cross-table.

If an event is half-K, check the appropriate box; likewise if all of your prior tournament games were wins or losses, check the matching box.