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Opposite-Color Bishop Endgames

Advanced Must Know

Opposite-colored bishop endings have a notorious reputation: "The drawing tendency." But understanding when they draw and when they don't is essential knowledge.

The Core Concept​

Each bishop controls squares the other cannot touch. This creates unique dynamics:

  • The defender can blockade on "safe" squares
  • The attacker cannot use the bishop to evict the blocking pieces
  • Extra pawns may not be enough to win

The Classic Blockade​

FEN: 8/8/8/3k4/3P4/2K5/8/2b2B2 w - - 0 1

White has an extra pawn, but this is a dead draw.

1.Kc4 Bc2! — The bishop blockades from a safe light square.

2.Be2 Bb3+ 3.Kc3 Bc2 — White cannot make progress. The dark-squared bishop cannot attack the light-squared blockade.

Why Extra Pawns Don't Always Help​

FEN: 8/8/2p5/2Pk4/3P4/3K4/3B4/2b5 w - - 0 1

Even with two extra pawns, White cannot win:

1.Ke3 Bb2 2.Bf4 Bc1+! — The bishop holds both pawns.

3.Kd3 Bb2 4.Be5 Ba3 — Black's bishop oscillates between a3 and c1, controlling both d4 and c5.

The pawns are on dark squares, but Black's bishop controls those squares. White's bishop cannot help.

When Opposite Colors DO Win​

1. Pawns on Both Sides​

FEN: 8/pp5k/8/5PP1/8/6K1/8/2B3b1 w - - 0 1

This is winning for White. The bishop cannot cover both wings:

1.Kf4 Kg7 2.Ke5! — The king invades.

2...Kf7 3.f6 — Now either f6-f7-f8=Q or the king penetrates via e6.

Black's bishop can only cover one side of the board.

2. Connected Passed Pawns (Far Advanced)​

FEN: 8/8/3PP3/8/8/6k1/5b2/4K3 w - - 0 1

Connected passed pawns on the 6th rank usually win:

1.Kd2! — Shielding from checks.

1...Kf4 2.Kc3 Ke5 3.Kc4 Be3 4.d7! — One pawn diverts the bishop.

4...Bxd7 5.exd7 — The pawn queens.

3. King Penetration​

FEN: 8/p7/Pp3k2/1P6/8/5K2/B7/5b2 w - - 0 1

If the attacking king can invade, even one extra pawn can win:

1.Ke4 Ke6 2.Kd4 Kd6 3.Bb1! — Clearing the way.

3...Kc7 4.Kc5 Bd3 5.Be4! — Dominating.

5...Be2 6.Kb4 Bd1 7.Ka5 — The king reaches a7, winning the a-pawn and the game.

4. The "Two Diagonals" Rule​

A critical guideline: If your passed pawns control two different diagonals, you can often win.

FEN: 8/8/8/1Pk5/P7/8/6B1/4K2b w - - 0 1

The a and b pawns are on different diagonals (a4-e8 and b5-f1). Black's bishop cannot cover both:

1.Kd2 Kc4 2.Kc2! — The king shields.

2...Bf3 3.Bd5+ Bxd5 4.b6 — One pawn promotes.

The Rule of 7 Squares​

A rough guideline: With opposite-colored bishops, the attacker needs pawns spanning at least 7 files to reliably win.

FEN: 8/p4p1k/8/8/1PP5/8/5K2/2B3b1 w - - 0 1

Pawns from b4 to f7 span 5 files. This is likely a draw with correct defense.

FEN: 8/p6p/8/8/1P4P1/8/5K2/2B3b1 w - - 0 1

Pawns from b4 to h7 span 7 files. This is winning for White.

Defensive Technique​

Create a Fortress​

FEN: 8/8/4k3/3pPp2/3P1P2/8/8/3bK2B w - - 0 1

Black draws by blockading:

1.Kd2 Bc2! 2.Kc3 Bd1 — The bishop patrols c2-d1-e2, keeping the white king out.

3.Bg2 Kd7 4.Bh3 Ke6 — Nothing breaks through. Draw.

Keep Your Bishop Active​

FEN: 8/8/2p1k3/1pP1p3/1P2P3/8/6K1/B6b w - - 0 1

1...Bg2! is correct—keeping the bishop active and flexible.

Not 1...Bf3? which locks the bishop in.

Use Your King​

FEN: 8/1p4k1/1P4p1/6P1/8/8/4K3/B6b w - - 0 1

1...Kf7! 2.Kd3 Ke6 3.Kc4 Kd6 — The king blockades b6.

White cannot make progress.

Famous Example: Fischer's Technique​

Fischer was a master at winning opposite-color bishop endings through king activity and creating weaknesses on both wings.

FEN: 8/1p3pkp/p5p1/P7/1P6/6P1/5PKP/3B2b1 w - - 0 1

White to play would maneuver:

  1. Advance kingside pawns to create weaknesses
  2. Use the king to attack one side
  3. Switch to the other side when the bishop moves

The defender cannot cover both flanks.

Exercises​

Exercise 1​

FEN: 8/8/4k3/8/3PP3/8/8/3bK2B w - - 0 1

White to move. Can White win?

Solution

Yes, but it requires technique.

1.Kd2! Kd6 2.Kd3 Bc2+ 3.Ke3 Bd1 4.d5! — Creating separation.

4...Kc5 5.e5! — Now the pawns are too far apart.

5...Kxd5 6.e6! — One pawn promotes.

Connected passed pawns on the 5th rank win if they can advance together.

Exercise 2​

FEN: 8/p6p/8/1Pk5/1P6/8/6K1/2B3b1 w - - 0 1

White to move. What's the result?

Solution

Draw with correct defense.

1.Kf3 Bd4 2.Ke4 Bc3 3.Kd3 Kb6 — Black's bishop and king cover everything.

4.Kc4 Bf6 5.Bd2 Bg7 — The bishop covers b2 from the long diagonal.

White cannot make progress. The pawns don't span enough files.

Exercise 3​

FEN: 8/p5kp/6p1/8/PP6/8/5K2/2B3b1 w - - 0 1

White to move. How should White proceed?

Solution

White wins with king invasion.

1.Ke3 Kf6 2.Kd4 Ke6 3.Kc5 Kd7 4.Kb6! — The king invades.

4...Kc8 5.a5! — Creating the breakthrough.

5...Bf2 6.b5 axb5 7.a6 — The pawn promotes.

The pawns spanned enough files (a to h), and the king penetrated.

Summary​

  1. Drawing tendency — But not automatic draws
  2. Blockade defense — Works when pawns are on one wing
  3. Pawns on both wings — Usually winning for the attacker
  4. Connected passers — Win if far enough advanced (6th rank)
  5. Rule of 7 squares — Pawns spanning 7+ files usually win
  6. King activity — The key factor in winning these endings