4. Mate in two moves (by teams of chessmen)
Mate in two puzzles collected according to the team of mating chessmen assisted by the king: lone rook, two rooks, lone queen, bishop with pawns, knight with a pawn, rook with pawns, queen with pawns, just pawns, bishop pair with pawns, two knights with pawns, bishop and knight with pawns, rook and bishop, rook and knight, queen and bishop, queen and knight, queen and rook with pawns.
5. Mate in two moves (number of chessmen)
A mate-in-two collection with various numbers of chessmen where at least three pieces cooperate in giving mate.