For a sacrificed pawn you must: a) GAIN THREE TEMPI, b) DEFLECT the enemy QUEEN, c) PREVENT CASTLING, d) BUILD UP a strong attack.
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TEN OPENING RULES
For a sacrificed pawn you must:
a) GAIN THREE TEMPI,
b) DEFLECT the enemy QUEEN,
c) PREVENT CASTLING,
d) BUILD UP a strong attack.