Promotion Race Flank Break Rule

White pushes f6, advancing the candidate pawn to create a menacing passed pawn that threatens immediate promotion.

Black responds with g4, attempting to create distraction and generate pawn play on the kingside.

White takes with hxg4, neutralizing Black's thrust while maintaining full control over the momentum.

Black pushes e2, bringing a central passed pawn one square away from promotion.

White plays Kf2, directly attacking Black's e2-pawn and immediately putting a halt to its advance.

Black pushes h3, trying one last effort to undermine White's defensive king setup.

White advances to f7, establishing a guaranteed pawn promotion on the next turn and ensuring a clear, game-winning position.

In the game, White played Kf3?! because if it were Black's move, Black would break through with g4! and e2; White thought stepping the king to f3 simultaneously guarded g4 twice and covered e2. The gap in White's thinking is that Kf3 walks directly into g4+! with check: if 38. Kxg4, then 38...e2! wins because the king was decoyed off the e2 blockade square, and after 38. hxg4 h3!, Black's two separated passed pawns (h3-h2 and e3-e2) overload White's king.

Black plays g4+!, striking with check while White's f5-pawn has not yet advanced to f6.

White plays hxg4, forced to capture with the pawn since 38. Kxg4 allows 38...e2! immediately.

Black advances h3!, creating an outside passed h-pawn that stretches White's king between the h-file and e2.

White plays g5, trying to mobilize remaining kingside pawns in a delayed race.

Black pushes h2, advancing the h-pawn to the verge of promotion.

White moves Kg2, directly attacking Black's h2-pawn in an attempt to block its path.

Black plays e2, advancing a second passed pawn to force promotion and achieve a decisive, game-winning advantage.

White moves the h-pawn—which was under attack—to h5, fixing Black's h6-pawn on a dark square to turn it into a permanent positional target.

White plays Ke2!, prioritizing defense against Black's advanced kingside promotion race by bringing the king toward f1 and g1.

Black plays Kh2, stepping the king into the corner to clear the g-file and escort the g- and h-pawns.

White plays Kf1!, arriving just in time to control g1 and prepare the rook sacrifice on h3.

Black pushes g3, advancing the g-pawn to the sixth rank to threaten g2.

White sacrifices the rook with Rxh3+!, eliminating Black's h3-pawn with check and deflecting Black's king.

Black plays Kxh3, forced to recapture the rook on h3.

White plays Kg1!, blockading Black's last pawn on g2 so White's outside a2-pawn can now march up the board unchallenged to win the game.

In the game, White played a4?!, thinking the h8-rook could handle Black's kingside pawns while the a-pawn raced up the board. The gap in White's calculation is that sacrificing the rook on g1 (74. Rg8 g1=Q+ 75. Rxg1 Kxg1) leaves Black's second passed pawn on h3 untouched, allowing 76. a7 h2 77. a8=Q h1=Q where both sides queen simultaneously in a dead draw.

Black plays Kh2, clearing the g3-square so the g-pawn can sprint to promotion.

White pushes a5, continuing the queenside flank race while leaving the kingside undefended.

Black pushes g3, advancing the passed g-pawn to the sixth rank.

White pushes a6, still two moves away from queening.

Black pushes g2, threatening immediate promotion on g1 with check.

White is forced to play Rg8, retreating the rook to guard the g1 promotion square.

Black promotes with g1=Q+, forcing White to give up the rook for the new queen.

White captures with Rxg1, eliminating the queen on g1.

Black recaptures with Kxg1. Final Assessment: With Black's king and h3-pawn stopping everything, Black easily holds a draw and White's winning advantage is completely thrown away.

White advances the passed h-pawn with h5!, threatening to queen on h8 and forcing Black's king to abandon the e4-pawn to chase the h-pawn.

Black pushes e3, trying to accelerate the central passed pawn before retreating the king.

White retreats the king to d3!, directly stopping Black's e3-pawn while the h5-pawn ties down Black's king.

Black is forced to play Kg5, retreating the king to stop White's h5-pawn from promoting.

White captures the central passed pawn with Kxe3!, leaving Black's g3-pawn doomed as well and securing an easily winning king-and-pawn endgame.

In the game, White played the queenside flank break c4?!, assuming Black would recapture 48...bxc4 49. Kxc4 while White's king remained within reach of the e4-pawn. The gap in White's thinking is that Black does not recapture immediately: Black plays the intermezzo 48...e3! first, so that 49. Kd3 is met by 49...bxc4+! with check, winning a decisive tempo for Black's pawn race.

Black plays e3!, immediately accelerating the central passed pawn now that White's d3-square is obstructed and White wasted a tempo on c4.

White plays Kc3, forced to retreat the king to c3 to stay in the square of the e3-pawn.

Black captures with bxc4, creating a passed c4-pawn while keeping the e3- and g3-pawns alive.

White pushes h5, trying to start the kingside race one tempo too late.

Black plays Kg5, effortlessly catching White's h5-pawn while Black's widely separated passed pawns on c4 and e3 overload White's king for a decisive Black victory.