The Ladder Mate also known as a lawnmower mate, is by far one of the most common checkmate patterns. In this mate, two major pieces (which can be two queens, two rooks or one rook and one queen) work together to push the enemy king to one side of the board.
Convert all the letters in the checkmate into numbers A=1, B=2... Y=25, Z=26 etc..
LADDERMATE = ABCDEFGHIJ
The cache can be found at:-
N55 (E-J)C. (A-C)DJ
W001 (D-B)(I-F). H(C-B)(I-A)