Absolute Pin

Pin a piece against your opponent's King

10 Gamerscore

Alekhine’s Gun

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

10 Gamerscore

Back-rank Mate

Deliver checkmate by a Rook or Queen along a back rank, with the King's escape blocked by friendly p

10 Gamerscore

Doubled Pawn

Have two pawns of the same colour on the same file

10 Gamerscore

O-O-O

Castle queenside

10 Gamerscore

O-O

Castle kingside

10 Gamerscore

Check

Put an opponent in check

10 Gamerscore

Checkmate

Win a game

10 Gamerscore

Chop Wood

Make a capture or exchange

10 Gamerscore

Promotion

Advance a pawn to the eighth rank

10 Gamerscore

Underpromote

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

10 Gamerscore

En Passant

Perform an en passant capture

10 Gamerscore

Double Check

Deliver a check by two pieces at the same time

10 Gamerscore

Learner

Complete all the tutorials

10 Gamerscore

Piece Collector

Capture 100 pieces

10 Gamerscore

Epaulette Mate

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

10 Gamerscore

Fool's Mate

Win a game in three moves

10 Gamerscore

Scholar's Mate

Win a game in four moves

10 Gamerscore

Octopus

Place a White Knight on e6

10 Gamerscore

Spanish Bishop

Develop a White King Bishop to b5

10 Gamerscore

Tournament Amateur

Win a tournament

10 Gamerscore

Problem Solver

Complete 50% of the chess challenges

10 Gamerscore

Elo

Beat an opponent with an Elo rating higher than yours

10 Gamerscore

Stranger Danger

Create a random online game

10 Gamerscore

Friendly Fire

Issue an online challenge to a friend

10 Gamerscore

Bobby Time

Play a game using the Fischer timer

25 Gamerscore

Queen Sacrifice

Sacrifice the Queen then go on to win the game

25 Gamerscore

Family Fork

Using a Knight simultaneously attack the enemy King and Queen

25 Gamerscore

Elo Elo

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

25 Gamerscore

Tournament Pro

Win 5 tournaments

25 Gamerscore

Blind Pigs

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

25 Gamerscore

Stalemate

Draw a game by stalemate

50 Gamerscore

Boden's Mate

Deliver checkmate by two crisscrossing Bishops, with the King's escape blocked by friendly pieces

50 Gamerscore

Tournament Champion

Win a 32 player tournament

50 Gamerscore

Elo Elo Elo

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

100 Gamerscore

Chess Champion

Beat the computer on Grandmaster difficulty

100 Gamerscore

Problem Solved

Complete all the chess challenges

100 Gamerscore

Tournament Master

Win 20 tournaments

150 Gamerscore