'Mate' is for positions with white to move, 'mated' for positions with black (the bare King) to move. Mated-in-0 means black is already in (check)mate, mate-in-1 means white's (best) move will terminate the game. The number in those columns is the number of positions from which the result can be forced in the given number of moves (3rd column). There is no mate-in-0, but the logical successor of mate-in-1 would be positions where white can capture the King (which would be illegal in a variant with a checking rule), given in the fore-last row.
The final row gives the total of the columns, expressed as a fraction of the total number of pseudo-legal positions (= ignoring any checking rule, but without multiple pieces on the same square). For generally won end-games the left will be close to 100%, but the black-to-move fraction will be much lower, because of positions where black can capture a King or an unprotected piece. For generally drawn end-games the right number will be close to 0%, but the left number will be much higher because of King captures, and can be over 50% if white has a strong piece.
'Mate' is for positions with white to move, 'mated' for positions with black (the bare King) to move. Mated-in-0 means black is already in (check)mate, mate-in-1 means white's (best) move will terminate the game. The number in those columns is the number of positions from which the result can be forced in the given number of moves (3rd column). There is no mate-in-0, but the logical successor of mate-in-1 would be positions where white can capture the King (which would be illegal in a variant with a checking rule), given in the fore-last row.
The final row gives the total of the columns, expressed as a fraction of the total number of pseudo-legal positions (= ignoring any checking rule, but without multiple pieces on the same square). For generally won end-games the left will be close to 100%, but the black-to-move fraction will be much lower, because of positions where black can capture a King or an unprotected piece. For generally drawn end-games the right number will be close to 0%, but the left number will be much higher because of King captures, and can be over 50% if white has a strong piece.