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9- Pawn promotion

 

In the early days of chess, a pawn that had pushed its way through the opponent’s lines and reached the opposite end of the board was automatically promoted to a “mantri” (the Sanskrit word for “counsellor”) a weak piece that moved a single square on the diagonal. In the European version of the game, the mantri would become the queen and see its movement greatly enhanced. And that is how a promotion to the weakest piece had become a promotion to the strongest one.

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Once again this is a rule that has varied greatly over the ages. Many players objected earlier on to the king having two queens – some still do – and for a while the pawn could only promote to a piece that had already been captured. At other times, a pawn could only promote to the piece of the file on which it promoted, or on which it started, with the exception of the king’s pawn which was permitted to promote to a queen since one could not (of course...) have two kings.

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Under the modern rules of chess, a pawn that reaches the last rank must be promoted as part of the play, and the promotion may be to any piece at the player’s discretion. Known as the “unrestricted promotion rule”, it became popular in the 19th century and was almost universally accepted by the end of it. And since the queen is by far the most powerful piece of the game, it naturally follows that the vast majority of promotions are to a queen, a process that is usually referred to as “queening”.

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A consequence of the new promotion rule was to make the material gain of a single pawn a much greater advantage than it initially was. Under the original rule, when a pawn could only promote to a mantri, a single pawn ending was always a draw since a mantri and a king could not force a mate. But with the introduction of the unrestricted promotion rule, a single pawn ending – if the said pawn could safely reach the last rank and promote – would usually translate into an easy win.

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The rules of pawn promotion under Chess 99 return to the original philosophy of the game and promotions are now limited to the two minor pieces, bishops and knights, and nothing else. And there is one other significant difference: A pawn reaching the last rank does not promote as part of the same play. (This will preclude any argument over the capture “en passant” of a pawn reaching the last rank on a two-square move.) Furthermore, a pawn standing in the last rank does not attack any square at this time. (Whenever it is promoted, it is not permitted to capture an opponent’s piece as part of the same play.)

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The rules of pawn promotion in Chess 99:

  • A pawn reaching the opposite end of the board is not permitted to promote as part of the same play.

  • A pawn standing in the last rank may be promoted whenever the player has the move.

  • Promotion may only be to a knight or a bishop.

  • The choice of piece is not limited to knights and bishops that have been previously captured.

  • The promoted piece may make a move as part of the play but it is not actually required to do so. (“On-the-spot” promotions are permitted.)

  • If the promoted piece does not make a move, no other piece may be moved in its place.

  • If the promoted piece does make a move, it is never permitted to capture an opponent’s piece as part of the same play.

  • The promoted piece will gain all of its attributes on the subsequent play.

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Do note the following:

  1. A pawn reaching the last rank on a two-square move may be captured “en passant” like any other.

  2. You may never have both a promotion and a capture on the same play.

  3. A player will never have two queens, two paladins, or three rooks.

  4. A player may have three (or more) knights and bishops.

  5. Since a king and a single knight or bishop cannot force a mate, a single pawn ending should be a draw.

  6. Since a pawn that is being promoted may remain on its original square, this makes it the only play where no piece is actually moved.

 

Example of promotion #1:

White has just played the a-pawn to the last rank. Black plays Bd6 attacking both the pawn and the knight. White could promote the pawn to a bishop but since it is not permitted to capture a piece on the same play, it would be readily captured by black. White seems bound to lose a piece and this game will be a draw from lack of material.

Promotion5.png

White plays a=Nc8+ promoting the pawn to a knight. Black finds themselves in check and they must now play the king. White captures the bishop. This has become a two knight endgame. If white plays correctly, they will win this game.

Example of promotion #2:

White has just played Ke4 attacking blacks knight. Black plays Nb4 and attacks whites bishop.

Promotion6.png

White plays g=B+ promoting the pawn to a bishop and forfeiting the move. Black is in check and must play the king. White captures the knight and this has become a two bishop endgame.

Example of promotion #3:

White has just played Nd6 attacking blacks rook on f5. Black plays Rd5 and attacks whites knight. If white saves the knight, the pawn is lost.

Promotion7.png

White plays d=Bf7+ promoting the pawn to a bishop. Black is in check and will lose the rook. (Black could play Rc5!+ for a double-check but white answers with Kd4 and the rook must fall.) We now have a bishop and knight endgame. (Note: With the bishop on light squares, and the four corners being dark, it will not be possible to force a checkmate; but it is still possible to force a capture. )

Example of promotion #4:

In this example black is clearly in the superior position but to win this game their last pawn on a6 must reach the last rank and promote. To avoid defeat, white must absolutely capture that pawn.

 

Although white has the move, black has a significant advantage in that the pawn can move twice as fast as the king. Will white be able to stop the pawn from safely reaching the last rank? Click on the right arrow to see the play unfold.​

DelayedPromo1.png

As the black pawn reached a1, the king moved to b2. If the pawn promotes to a bishop it has nowhere to go (as it may not promote and capture a piece on the same play) and so will be readily captured. If it promotes to a knight, it may only go to b3 or c2, and either way will be captured. This game is a draw.

 

How to perform pawn promotion:

A pawn standing in the last rank may be promoted whenever the player has the move. The promoted piece is then permitted a move but it is not actually required to make one. If a move is intended, the piece that the pawn promotes to should be picked up first and placed on its destination square. The pawn is then removed from the board and this completes the play. Should the pawn be picked up before the piece is on the board, or should the piece be placed on an illegal square, on-the-spot promotion is automatically implied and the piece may not be moved on this play.​

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