Two pawns against one: go around before you break through

From Chess Fundamentals by José Raúl Capablanca (1921), Chapter 1 — First Principles, Example 7 (Pawn Endings) · Beginner · about 3 minutes.

Two connected pawns against one looks like it should win by simply pushing — and it doesn't. Here 1.f6 fails: Black answers with the king to g8, trades when forced, and holds. The winning idea is a detour: walk the king AROUND to the seventh rank first, so that when the pawn break finally comes, every consequence favours White. The pawns are the hammer; the king is the aim.

Starting position (FEN): 5k2/6p1/4K1P1/5P2/8/8/8/8 w - - 0 1

The line

• 1. Kd7 — Not 1.f6? — Black plays Kg8!, and after the trade on f6 the king reaches the corner and holds. Instead the king goes around the back.
• 1... Kg8
• 2. Ke7 — From e7 the king commands f8 and f7 — the squares Black's defence depends on.
• 2... Kh8
• 3. f6 — NOW the break works, because the king arrived first.
• 3... gxf6 — Forced in effect: keeping the pawn back with Kg8 instead loses at once to f7+ and f8=Q#.
• 4. Kf7 — The point of everything: White ignores the f-pawn completely. The g-pawn queens under the king's escort, and Black's extra pawn is a bystander.
• 4... f5
• 5. g7+
• 5... Kh7
• 6. g8=Q+ — Promotion with check — and Black's pawn is still running in the wrong race.
• 6... Kh6
• 7. Qg6# — The new queen mates immediately, supported by her king.

Takeaway

When a pawn break looks natural, ask where your king will stand AFTER it. The break that fails now often wins outright once the king has walked around — pawns break through positions, but kings win them.

Play this lesson move by move on the interactive board at https://www.brilliantknight.com/lessons/chess-fundamentals-first-principles/the-two-pawn-breakthrough · All lessons