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Two or three moves counted in squares. Type the square you end on.
Pro tip: Turn the letters into numbers: a=1 up to h=8. Add each move to the pair, and only turn it back into a square at the end.
A square appears, then two or three moves spelled out in counts: two to the right and one up, then three down. You follow them in your head and type the square you end on. It is the one calculation a blindfold player does more often than any other. Does the bishop on c4 hit f7? Four across and four up from a1 is which square? With a board in front of you the eye answers for free. Without one, you count, and every step starts from a square you only believe you are on.
The trick is to stop reading squares as words and start reading them as pairs of numbers: a is 1 and h is 8, so c4 is (3,4) and f7 is (6,7). Three across, three up, equal, so they are on a diagonal and the bishop does hit f7. Add each move to the pair and only turn it back into a square at the end. The knight mode drills the same counting where it is hardest, over chained jumps, because an L has no straight line to sight along. Once the counting is automatic the diagonals drill and the bishop maze stop being arithmetic and start being chess. The full method is in the bishop diagonals lesson.