The classic breakthrough pattern involves three connected pawns (for example on a5, b5, c5) against three defending pawns (a7, b7, c7 or a6, b6, c6). By sacrificing one pawn, the attacker opens a path for one of the remaining pawns to advance past all defenders and promote. The defending side cannot stop both remaining pawns.
The breakthrough typically works like this: advance the center pawn (b5-b6). If the defender captures (axb6 or cxb6), the other pawn on the opposite side advances and becomes an unstoppable passed pawn. If the defender does not capture, the center pawn promotes. This simple but powerful idea decides many endgames.
Recognizing breakthrough possibilities is essential for both attack and defense. When you have connected pawns facing enemy pawns, check if a breakthrough sacrifice works. When defending, be aware that allowing certain pawn configurations can lead to an unstoppable breakthrough. Breakthrough patterns often appear in more complex endgames where timing the sacrifice correctly is the key to winning.