The Queen

The queen (♕, ♛) is the most powerful piece in the game of chess. It can move any number of squares vertically, horizontally or diagonally, combining the powers of the rook and bishop. Each player starts the game with one queen, placed in the middle of the first rank next to the king. Because the queen is the strongest piece, a pawn is promoted to a queen in the vast majority of cases.

The predecessor to the queen is the ferz, a weak piece only able to move or capture one step diagonally, originating from the Persian game of shatranj. The modern queen gained its power and its modern move in Spain in the 15th century during Isabella I's reign, perhaps inspired by her great political power.

The white queen starts on d1, while the black queen starts on d8. With the chessboard oriented correctly, the white queen starts on a white square and the black queen starts on a black square—thus the mnemonics "queen gets her color", "queen on [her] [own] color", or "the dress [queen piece] matches the shoes [square]" (Latin: servat rēgīna colōrem).

The queen can be moved any number of unoccupied squares in a straight line vertically, horizontally, or diagonally, thus combining the moves of the rook and bishop. The queen captures by moving to the square on which an enemy piece stands.

Although both players start with one queen each, a pawn can be promoted to any of several types of pieces, including a queen, when the pawn is moved to the player's furthest rank (the opponent's first rank). Such a queen created by promotion can be an additional queen or, if the player's queen has been captured, a replacement queen. The queen is by far the most common piece type a pawn is promoted to due to the relative power of a queen; promotion to a queen is colloquially called queening. The queen is typically worth about nine pawns, which is slightly stronger than a rook and a bishop together, but slightly less strong than two rooks, though there are exceptions. It is almost always disadvantageous to exchange the queen for a single piece other than the enemy's queen.

The reason that the queen is stronger than a combination of a rook and bishop, even though they control the same number of squares, is twofold. First, the queen is more mobile than the rook and the bishop, as the entire power of the queen can be transferred to another location in one move, while transferring the entire firepower of a rook and bishop requires two moves, the bishop always being restricted to squares of one color. Second, unlike the bishop, the queen is not hampered by an inability to control squares of the opposite color to the square on which it stands. A factor in favor of the rook and bishop is that they can attack (or defend) a square twice, while a queen can only do so once. However, experience has shown that this factor is usually less significant than the points favoring the queen.[1]

The queen is strongest when the board is open, the enemy king is poorly defended, or there are loose (i.e. undefended) pieces in the enemy camp. Because of its long range and ability to move in multiple directions, the queen is well-equipped to execute forks. Compared to other long range pieces (i.e. rooks and bishops), the queen is less restricted and stronger in closed positions.

A player should generally delay developing the queen, as developing it too quickly can expose it to attacks by enemy pieces, causing the player to lose time removing the queen from danger. Despite this, beginners often develop the queen early in the game, hoping to plunder the enemy position and deliver an early checkmate, such as Scholar's mate.

Early queen attacks are rare in high-level chess, but there are some openings with early queen development that are used by high-level players. For example, the Scandinavian Defense (1.e4 d5), which often features queen moves by Black on the second and third moves, is considered sound and has been played at the world championship level. Some less common examples have also been observed in high-level games. The Danvers Opening (1.e4 e5 2.Qh5), which is widely characterized as a beginner's opening, has occasionally been played by the American grandmaster Hikaru Nakamura.[2]

A queen exchange often marks the beginning of the endgame, but there are queen endgames, and sometimes queens are exchanged in the opening, long before the endgame. A common goal in the endgame is to promote a pawn to a queen. As the queen has the largest range and mobility, queen and king vs. lone king is an easy win when compared to some other basic mates. Queen and king vs. rook and king is also a win for the player with the queen, but it is not easy.

A queen sacrifice is the deliberate sacrifice of a queen in order to gain a more favorable tactical position. One of the most widely known examples of this was in the game Anderssen–Kieseritzky, 1851, where Anderssen sacrificed a queen (along with three other pieces) to reach checkmate. 

The queen was originally the counsellor or prime minister or vizier (Sanskrit mantri, Persian farzīn, Arabic firzān, firz or wazīr). Initially, its only move was one square diagonally. Around 1300, its abilities were enhanced to allow it to jump two squares diagonally (onto a same-colored square) for its first move.

The fers changed into the queen over time. The first surviving mention of this piece as a queen or similar is the Latin regina in the Einsiedeln Poem, a 98-line Medieval Latin poem written around 997 and preserved in a monastery at Einsiedeln in Switzerland. Some surviving early medieval pieces depict the piece as a queen. The word fers became grammatically feminized in several languages, such as alferza in Spanish and fierce or fierge in French.[3] The Carmina Burana also refer to the queen as femina (woman) and coniunx (spouse),[4] and the name Amazon has sometimes been seen.[5]

During the great chess reform at the end of the 15th century, Catholic nations kept using an equivalent of Latin domina ("lady"), such as dama in Spanish, donna in Italy, and dame in France, all of which evoke "Our Lady". However, Protestant nations such as Germany and England refused any derivatives of domina as it might have suggested some cult of the Virgin Mary and instead opted for secular terms such as Königin in German and "queen" in English.[6]

In Russian, the piece keeps its Persian name of ferz; koroleva (queen) is colloquial and is never used by professional chess players. However, the names korolevna (king's daughter), tsaritsa (tsar's wife), and baba (old woman) are attested as early as 1694.[7] In Arabic countries, the queen remains termed and, in some cases, depicted as a vizier.[8]

In most languages the piece is known as "queen" or "lady" (e.g. Italian regina or Spanish dama). Asian and Eastern European languages tend to refer to it as vizier, minister or advisor (e.g. Arabic/Persian وزیر wazir (vazir), Russian/Persian ферзь/فرز ferz). In Polish it is known as the hetman, the name of a major historical military-political office, while in Estonian it is called lipp ("flag", "standard").