Type 7: Mate by Pawn xy promoted to piece Z (Black)
Pa7Q - Mate by Pawn a7 promoted to a Queen
Pa7R - Mate by Pawn a7 promoted to a Rook
Pa7B - Mate by Pawn a7 promoted to a Bishop
Pa7N - Mate by Pawn a7 promoted to a Knight
Pb7Q - Mate by Pawn b7 promoted to a Queen
Pb7R - Mate by Pawn b7 promoted to a Rook
Pb7B - Mate by Pawn b7 promoted to a Bishop
Pb7N - Mate by Pawn b7 promoted to a Knight
Pc7Q - Mate by Pawn c7 promoted to a Queen
Pc7R - Mate by Pawn c7 promoted to a Rook
Pc7B - Mate by Pawn c7 promoted to a Bishop
Pc7N - Mate by Pawn c7 promoted to a Knight
Pd7Q - Mate by Pawn d7 promoted to a Queen
Pd7R - Mate by Pawn d7 promoted to a Rook
Pd7B - Mate by Pawn d7 promoted to a Bishop
Pd7N - Mate by Pawn d7 promoted to a Knight
Pe7Q - Mate by Pawn e7 promoted to a Queen
Pe7R - Mate by Pawn e7 promoted to a Rook
Pe7B - Mate by Pawn e7 promoted to a Bishop
Pe7N - Mate by Pawn e7 promoted to a Knight
Pf7Q - Mate by Pawn f7 promoted to a Queen
Pf7R - Mate by Pawn f7 promoted to a Rook
Pf7B - Mate by Pawn f7 promoted to a Bishop
Pf7N - Mate by Pawn f7 promoted to a Knight
Pg7Q - Mate by Pawn g7 promoted to a Queen
Pg7R - Mate by Pawn g7 promoted to a Rook
Pg7B - Mate by Pawn g7 promoted to a Bishop
Pg7N - Mate by Pawn g7 promoted to a Knight
Pg7Q - Mate by Pawn h7 promoted to a Queen
Pg7R - Mate by Pawn h7 promoted to a Rook
Pg7B - Mate by Pawn h7 promoted to a Bishop
Pg7N - Mate by Pawn h7 promoted to a Knight