Petekaboom

Stack two Rooks one behind another in the same file with the Queen at the rear

Deliver checkmate by a Rook or Queen along a back rank

Manoeuvre a pair of rooks onto your opponent’s second rank

Deliver checkmate where the King has castled queenside and is checkmated by two crisscrossing Bishops

Beat the CPU on GrandMaster difficulty

Deliver a check by two pieces at the same time

Beat an opponent with an ELO rating higher than yours

Beat an opponent with an ELO rating more than 75 higher than yours

Beat an opponent with an ELO rating more than 150 higher than yours

Deliver checkmate where the King is blocked on both sides by his own Rooks

Win a game in three moves

Issue on online challenge to a friend

Complete all the chess challenges

Complete 50% of the chess challenges

Win a game in four moves

Win a tournament

Win a 32 player tournament

Win 20 tournaments

Win 5 tournaments

Promote a pawn to a Rook, Bishop, or Knight instead of a Queen