Rules of Chess

Overview
Chessboard
Chess Pieces
Pawn moves
En passant
Pawn promotion
Bishop moves
Knight moves
Rook moves
Queen moves
King moves
  Castling
Drawn games
  Stalemate
  50 move rule
  Insufficient material
  Perpetual check
  Threefold repetition
  Mutual agreement
Tournament rules
  Chess clocks
  Touch move
  Recording chess moves
  Chess etiquette

Chess Rules

Answer to underpromotion question

White has 12 possible pawn moves, because after the three possible destination squares, White must choose between promoting to a knight, bishop, rook or queen.

White is spoiled for choice!

Return to pawn promotion