Day 13of 14, Master the Fundamentals with Capablanca

The Long Diagonal Decides

Morrison vs Capablanca · New York 1918 · The Long Diagonal Decides

Here is the opposite-side castling race from the winning side, and the piece that wins it never moves. Capablanca fianchettoes on g7 and the bishop does two jobs at once, it shields his own king behind a healthy pawn shell and it stares down the long diagonal at the wing where White has castled. His pawn moves on the king-side gain space and harry White's pieces, and it is the bishop and the rooks that reach the king. Take one idea into your games, a fianchettoed bishop is not a defensive move, it is an attacking piece that happens to be at home.

Three ideas you'll take from this endgame

01

One piece, two jobs

The g7 bishop guards the king-side pawn shell and simultaneously attacks along the long diagonal toward the queen-side where White has castled.

02

Aim before you storm

Because the bishop already points at b2, Black's advances gain space and open lines with real force behind them. Space without an aimed piece is only noise.

03

Start the race on time

Even here Capablanca is slow, and the notes are honest about it. The immediate a6 and b5 was the accurate way to begin.

Study Mode: Watch & Play Along

Watch the lesson, then play the game through on the board below. The board stays with you as you scroll. Make each move yourself while you read. You'll remember a plan you played with your own hands far longer than one you only watched.

▶ The Lesson

♞ Play Through the Game: The Board Stays With You

The Big Idea

A bishop that defends and attacks at once

Capablanca chose the Steinitz Defence and then the fianchetto, and his own annotation explains why it appealed to him: the bishop on g7 exerts great pressure along the long diagonal and, at the same time, the bishop and pawns around a castled king form one of the great defensive formations. That double function is the whole game. When Morrison castles queen-side, the black bishop is already pointing at the very squares White must defend. Note what Black does and does not do: his king-side pawn moves, 12...g5 and 16...f5 and 17...f4, are not a storm at White's king, they gain space, harry the bishop on h4, and open the f-file, and they are safe because White has nothing aimed at the black king. The pieces then do the attacking, and 23...Nxe4 clears the diagonal the bishop has been waiting on for twenty moves. In your games, set the long diagonal first and let the pieces, not the pawns, reach the king.

How the Endgame Arose

A Steinitz Defence, and a bishop pointed at the queen-side

Capablanca met the Spanish with the solid 3...d6, a system he used often in his later career, and followed with g6 and Bg7. Morrison's play was slightly loose, retreating the knight to f3 rather than choosing the sharper setup with Be3 and Qd2, and later preferring Bh4 to Bf4, which would at least have delayed Black's castling. When Morrison committed his king to the queen-side, the strategic picture was already settled, because Black's pieces were pointed in the right direction and White's were not.

Stop and Assess

The kings are on opposite wings. Whose pieces are aimed?

Morrison has just castled queen-side and Black is castled king-side, so both players know they must storm the pawns in front of the enemy king. Material is level. The difference is not in the pawns yet, it is in where the pieces are already looking. Stop and assess before you read on.

Both sides must attack. Which black piece is already aimed at White's king, and what does that mean for the pawn storm?

Follow the long diagonal from g7 and see where it ends. Then ask which white piece is aimed at Black's king in the same way. Think, then reveal.

Morrison vs Capablanca, after 10.O-O-O, kings on opposite wings with Black's bishop on the long diagonal. — After 10.O-O-O, material is level, but the g7 bishop already points at White's king

Reveal the assessment

Black's method (Capablanca)

Aim the bishop. The g7 bishop points at the long diagonal and White's queen-side king.
Gain space safely. 12...g5 and 16...f5 harry White's pieces and open the f-file, safe because White threatens nothing.
Open the diagonal. 23...Nxe4 clears the long diagonal and the e-file, and the rooks invade.

White's problem (Morrison)

No piece aimed at the black king. The bishop on h4 and the pieces on the king-side attack nothing.
A slow setup. Nf3 and Bh4 instead of Be3, Qd2 and a fast storm.
A king behind loose pawns. Once the diagonal opens there is nothing to hold the queen-side together.

The Plan

Point the bishop, storm, then open the centre

Black's win has a clear shape. First the bishop is aimed, g6 and Bg7 are played before any commitment, so the attacking piece is in place before the attack exists. Second Black gains space on the king-side, 12...g5 hits the bishop on h4 and 16...f5 and 17...f4 open the f-file; this is safe, and worth stressing, only because White has nothing pointed at the black king. Third the pieces attack, 23...Nxe4 is the breakthrough, and after 24.Bxe4 Rxe4 the long diagonal and the open files combine, the rooks invade on the e-file, and White's king is eventually hunted all the way to a5. The honest footnote, which follows Capablanca's own notes, is that Coach Nic rates an earlier ...a6 and ...b5 as the more energetic way to open the queen-side; the game as played won by the diagonal and the files instead. In your games, aim the bishop first, and let pieces rather than pawns do the attacking when your own king sits behind the pawns you would have to push.

The Critical Moment: Think First

The pawn storm has done its work on the king-side and White's pieces are tangled. The g7 bishop has been staring down the long diagonal since move seven. It is the moment to open the line it has been waiting on.

Black to play. The long diagonal is nearly clear. Which capture opens it and breaks the position?

Morrison vs Capablanca, before 22...Nxe4, Black to open the long diagonal. — 22...Nxe4: the capture that clears the long diagonal for the g7 bishop

Reveal the move and the why

22...Nxe4, opening the diagonal at last. After 23.Bxe4 Rxe4 Black's rook stands in the centre, the g7 bishop finally sees all the way to b2, and White's king has no cover on the queen-side. The move is only possible because of a decision made fifteen moves earlier, when the bishop went to g7 and pointed itself at the far corner. That is the practical lesson: breakthroughs in an opposite-castling race are not found by calculation alone, they are made available by piece placement long beforehand. In your games, when you fianchetto toward the wing where your opponent will castle, treat the diagonal as a loaded weapon and look for the capture or push that unblocks it.

♞ Follow the Finish: The Board Returns

Aim First, Then Push

Invade the file, and collect

With the centre open the rooks take over. Black doubles on the e-file, and 31...Re1+ forces the exchange of a pair, after which the second rook comes to the same square with check. The white king has no shelter and every black piece has a line, which is what the g7 bishop bought twenty moves earlier.

Morrison vs Capablanca, before 31...Re1+, Black's rooks invade the open file. — 31...Re1+: the rooks invade and the white king has nowhere to hide

The finish is precise and unhurried. Black picks off the queen-side pawns with checks, the passed pawns run, and by move 41 White resigns. It is worth remembering the honest verdict on this game, Black won a race he could have started sooner, and the piece that made the difference was placed on move seven. Carry it into your games, point the bishop at their king before the storm, and begin the storm early.

Morrison vs Capablanca, the final position, Black is winning. — The finish: the diagonal, the open file and the passed pawns decide

Principles to Take to Your Own Board

This game is over. Your games are where it matters.

1 · A fianchetto is an attacking move.

The rule: the bishop on the long diagonal defends your king and attacks the far wing at the same time. In this game: the g7 bishop decided a queen-side race. In your games: when they castle opposite, aim the fianchetto at them.

2 · Aim pieces before you push pawns.

The rule: a pawn advance is an attack only when a piece is aimed behind it; otherwise it is just space. In this game: Black's king-side pawns gained ground and opened the f-file while the g7 bishop supplied the real threat. In your games: place the long-range piece first.

3 · Open the line your best piece needs.

The rule: look for the capture or push that clears the diagonal or file your strongest piece occupies. In this game: 22...Nxe4 unblocked the long diagonal. In your games: ask what is in your best piece's way.

4 · Start the race on move one of the race.

The rule: in opposite castling, open lines toward their king early. In this game: Coach Nic rates an earlier ...a6 and ...b5 as the more energetic route to White's king. In your games: prefer the plan that opens a line at the enemy king over one that only gains space.

5 · Judge an attack by the pieces pointing at the king.

The rule: count the pieces aimed at the enemy king, not the pawns you have advanced. In this game: White had none and lost the race before it started. In your games: if nothing is aimed, redirect before you push.

Test Yourself

Five questions before you go

1 · Why is the g7 bishop so valuable here?

Because it performs two jobs without moving. It supports the pawn shell around Black's own king, which is the standard defensive value of a fianchetto, and it simultaneously looks down the long diagonal at the queen-side where White has castled. In an opposite-castling race that dual function is worth a tempo every move.

2 · What was wrong with White's setup?

It never aimed anything at the black king. The knight retreat to f3 and the bishop on h4 are natural moves that create no threats, and the sharper plan with Be3, Qd2 and a fast king-side storm was available. In a race, a setup that attacks nothing is already losing.

3 · Why does 22...Nxe4 work?

Because it removes the last obstruction on the long diagonal while opening the e-file for the rooks. After 23.Bxe4 Rxe4 the bishop, the rook and the open lines all point at White's king at once. The move is a consequence of the earlier placement, not an isolated tactic.

4 · Did Capablanca play the race perfectly?

Not in Coach Nic's view. He rates an immediate ...a6 and ...b5 as the more energetic way to prise open White's queen-side, and the game as played won through the long diagonal and the open files instead. Grok pushed back that this is an evaluation rather than a requirement of the position, which is fair, it is a judgement about energy, not a claim that the game was mishandled.

5 · How do I apply this without a fianchetto?

The principle is about aim rather than the specific formation. Before you advance pawns at a castled king, check which of your pieces already looks in that direction, and if none do, spend the move redirecting one. A storm behind an aimed bishop, rook or queen is worth several storms behind nothing.

Sharpen Your Eye: Six Endgame Exercises

Now you convert the edge

Six exercises where two bishops hunt down a king, rising in difficulty. In each you have the winning side, so coordinate the diagonals and finish. Drag the pieces, the board plays the defence for you.

Aim the Piece. Then Push the Pawn.

Most club attacks are pawn storms with nothing behind them, which is why they run out of moves just as they get interesting. In a 2-hour Strategy Assessment I go through your own games, show you where your attacks lacked an aimed piece, and hand you a plan built for your chess, not a hypothetical student's.

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Next, Game 14: Marshall vs Capablanca, the series finale, where rook and bishop outrun rook and knight.