Mate in N

Give checkmate! — Cooperating Teams of Chessmen
Mate in N chess puzzles for practicing the effectiveness of cooperation between different teams of mating chessmen: rook and king, two rooks, queen and king, bishop with pawns, knight with pawns, rook with pawns, queen with pawns, pawns and the king, bishop pair with pawns, two knights with pawns, bishop and knight with pawns, queen and rook with pawns, rook and bishop, rook and knight, queen and bishop, queen and knight.

Give checkmate! — Various Numbers of Chessmen
Mate in N chess puzzles where at least three different chessmen cooperate to give mate.