Pawn race

A pawn race occurs when each side has at least one passed pawn, meaning a pawn with no enemy pawn ahead of it on the same or an adjacent file that can block it or capture it as it advances. Both players must calculate whether that pawn reaches the last rank and becomes another piece, whether the king catches the opposing pawn, or whether the new queens can be exchanged.

What must be counted

1. Which side moves first and exactly how many pushes each pawn needs to reach the last rank.
2. Whether a pawn can still make a two-square move from its starting position.
3. Whether promotion gives check, forcing a reply and consuming one of the opponent's moves.
4. Whether the new queen can capture the other pawn, give checks, or force an immediate queen exchange.
5. Whether either king can enter the imaginary square that extends from the pawn to its promotion square. Entering in time means the king can catch the pawn before it reaches the last rank.

Promoting first does not always mean winning. The first queen may appear far from the opposing pawn, be met by a check, or have to trade for the second queen. A king move can also serve two goals at once, as shown by the Réti maneuver.

A pawn breakthrough can start the race by sacrificing pawns to create one that cannot be stopped. The full sequence after the sacrifice must therefore be calculated, not just the runners' initial distances.