Chess Ultra

Pin a piece against your opponent's King

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, with the King's escape blocked by friendly pieces

Have two pawns of the same colour on the same file

Castle queenside

Castle kingside

Put an opponent in check

Win a game

Make a capture or exchange

Advance a pawn to the eighth rank

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

Perform an en passant capture

Deliver a check by two pieces at the same time

Complete all the tutorials

Capture 100 pieces

Win a game in four moves

Place a White Knight on e6

Develop a White King Bishop to b5

Complete 50% of the chess challenges

Beat an opponent with an Elo rating higher than yours

Create a random online game

Issue an online challenge to a friend

Play a game using the Fischer timer

Sacrifice the Queen then go on to win the game

Using a Knight simultaneously attack the enemy King and Queen

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

Maneuver a pair of Rooks onto your opponent’s second rank

Draw a game by stalemate

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

Beat the computer on Grandmaster difficulty

Complete all the chess challenges