The Coach Key

1White to move. Black's queen has infiltrated to d1. Count the attackers and defenders on that square, calculate the whole exchange to its end, and win material by force.

Model answer

1.Qxd1! Rxd1 2.Rxd1 wins a clean rook. The d1-square is attacked twice, by the queen on f3 (the f3-e2-d1 diagonal) and the rook on f1, but Black's queen there is defended only once, by the rook on d8. So the exchange runs in your favour: queen takes queen, rook takes queen, rook takes rook, and you are a whole rook up. The lesson: before any capture on a contested square, count attackers against defenders and calculate the trade to its very end.

2White to move, from a Colle-style middlegame. Black's knight has left f6 for d7, so h7 is thinly guarded. Calculate the classic bishop sacrifice Bxh7+ to a clear conclusion: is it sound here?

Model answer

Yes, this is the sound Greek Gift, and it is winning (an engine confirms a decisive White advantage). The key is that Black's queen on f6 does NOT guard g5, and no knight covers h7 or h5. After 1.Bxh7+ Kxh7 2.Ng5+ the king has no good square: 2...Kg8 3.Qh5 threatens Qh7 mate, 3...Qxg5 4.Bxg5 leaves White a clear pawn up with a raging attack, and other tries walk into mate. Contrast this with the version in your Tactics manual, where the queen DID guard g5 and the same sacrifice failed. The pattern is identical; only the calculation tells them apart. Always check the defender of g5 before you give the bishop.

3You are White in your London System, and Black has just grabbed the b-pawn with ...Qxb2, thinking it free. Punish the greedy queen: find the forcing idea and calculate it to a clear advantage.

Model answer

1.Nb5! turns the tables. The knight threatens Nc7+, a family fork of the king on e8 and the rook on a8, and the wandering queen on b2 is suddenly a target rather than a triumph. If Black scrambles to cover c7 the initiative and material both flow to White; the even stronger 1.Nxd5 wins outright. A chess engine confirms White is winning by roughly three points. The whole lesson: a pawn grabbed with the queen, far from home and early, is a debt, not a gift. Offer the b-pawn without fear and collect the interest when they take it.

4Opposite-side castling in your Open Sicilian. Before you touch a pawn, run the forcing-move scan for BOTH sides, then decide the plan. Is there an immediate blow, or is this a race to be counted?

Model answer

There is no immediate knockout here, and recognising that is the exercise. The habit of the strong player is to look first at every check, capture and threat, for both sides, on every move, before making the natural developing move. Having confirmed there is no tactic, the plan is clear: this is a race. Launch the king-side storm with g4-g5 and h4-h5, and count the moves to each king, because Black storms yours with ...b5-b4, ...a5 and the ...Rxc3 exchange sacrifice. If your count says you are faster, throw everything forward and never stop to defend; if he is faster, spend one move to cover and then resume. Forcing moves first, then the race.

5You are White in the Closed Ruy Lopez. Search honestly for a forcing win. If there is none, what is the correct decision? Calculate, then choose.

Model answer

There is no combination here, and half of calculation is knowing when to stop hunting for one. Having satisfied yourself that no forcing line wins, you improve: the classic Spanish plan of Nbd2-f1-g3 to bring the knight toward the king-side, keeping the central tension and the light bishop on the b1-h7 diagonal. The discipline of 1800-to-2000 is exactly this restraint, not forcing what is not there, but patiently improving your worst-placed piece until a real target appears. A quiet, purposeful move in a position with no tactic is the strongest move on the board.

6You are White in the London with both bishops trained on the king-side. Is the Greek Gift Bxh7+ sound yet? Calculate the refutation before you decide.

Model answer

Not yet, and calculating WHY is the exercise. Because Black's knight still sits on f6, the sacrifice fails: 1.Bxh7+ Kxh7 2.Ng5+ Kg8 3.Qh5 (threatening mate) runs into 3...Nxh5!, the f6-knight simply captures the queen, and White is a piece down for nothing. The attacking pattern is present but not yet sufficient. The correct play is to reinforce first: land the knight on e5, bring the queen toward h5 with the f6-knight distracted or traded, and only then strike. The mark of a strong player is recognising an attacking idea that is real but premature, and having the patience to add force before sacrificing.

7You are White in your London System. You have just landed the knight on e5. Lay out the whole attacking plan from here, move by move, and name the sacrifice you are angling for.

Model answer

The knight on e5 is the springboard. The plan: reinforce with f4 if needed, bring the queen toward the king-side (Qf3 or Qh5), and aim the two bishops at h7 and along the b8-h2 diagonal. The thematic sacrifice is Bxh7+ (the Greek Gift) once the defender of g5 is gone, or a knight break on f7 or g6 that exposes the king. If Black trades the e5-knight with ...Nxe5, recapture with the pawn (dxe5) to gain a wedge and open the d-file, or with the bishop to keep pieces aimed at the king. The London is not passive: the e5-knight plus the two bishops is a genuine attacking machine.

8You are White in the Closed Ruy Lopez (the Chigorin), and you have just played the big centre with d4. Explain the pawn-tension decision Black now faces and your plan whichever way he resolves it.

Model answer

You have reached the heart of the Ruy. Black must decide about the central tension: if he closes with ...c4 you get a free hand on the king-side with Nbd2-f1-g3 and the g4 advance; if he keeps the tension you maintain d4 and manoeuvre the knight to g3 and f5; if he takes ...cxd4 cxd4 you get a strong centre and the c-file. Your plan in every case is the classic Spanish one: reroute the b1-knight via d2-f1-g3, keep the light bishop on the b1-h7 diagonal, and play on the king-side where your space tells. Do not release the tension yourself; let Black commit first, then choose the plan that punishes his choice.

9You are White in the Open Catalan, and Black is trying to hold the extra c4-pawn with ...a6, ...b5 and ...Rb8. You have just played Nd2. What is the exact idea, and how does the pawn come back with interest?

Model answer

Nd2 targets the c4-pawn and prepares the thematic break. The idea is Ndxc4, or a4 first to crack the b5-c4 chain: after a4 the queenside pawns cannot all be held, and once b5 falls or is exchanged you regain c4 while the g2-bishop rakes the newly opened long diagonal at a8 and b7. You end up not merely level but with the initiative, the bishop pair aimed at Black's queenside, and targets on the light squares. The Catalan lesson holds: never chase the pawn in a panic; prepare the break, regain it on your terms, and collect the better position that comes with it.

10You are White in the English Attack against the Najdorf, and you have launched g4. Lay out the whole king-side storm, name the break that opens Black's king, and state the one thing you must watch on the other wing.

Model answer

The storm rolls: g4-g5 drives the f6-knight, then h4-h5 and the break with g5-g6 or hxg6 tears open the h-file for your rook and queen. Support it with Nd5 at the right moment, the thematic sacrifice that cracks the centre if Black allows it. The one thing you must watch is the race on the other wing: Black storms your king with ...b5-b4, ...a5-a4 and the ...Rxc3 exchange sacrifice. So count the race every move. If you are faster, throw everything forward and do not stop to defend; if Black is faster, spend one move to cover and then resume. In the Open Sicilian, the attacker who counts honestly and never loses his nerve wins.

11You are Black in the Advance French, fully mobilised with the knight on f5 pressing d4 and ...Bd7 in. Name your two pawn levers, the order to play them, and the piece plan behind the whole set-up.

Model answer

Your levers are ...f6 against the head of White's chain and, earlier, the ...c5 pressure against its base that you have already applied. Keep the pressure on d4 with the knight on f5, the queen on b6 and the pieces, and play ...f6 to strike e5 only once d4 is truly creaking and your king is safe. After ...f6 exf6 you recapture toward the centre and open lines at White's e5-point from both ends. The piece plan is the eternal French one: trade off your traditionally bad light-squared bishop, here via ...Bd7-b5 or ...Ba4, pile on d4, and win the base of the chain. Base before head; pieces before pawns.

12You are Black in the QGD, and you have played the Lasker Defence with ...Ne4 and traded pieces to free your cramped game. Explain what you have achieved and the exact plan to reach full equality.

Model answer

The Lasker's idea has worked: by trading the dark-squared bishops and a pair of knights you have relieved the cramp that is the QGD's one drawback. Now complete development with ...Bb7, put the light bishop on the long diagonal, and free the position with the ...c5 break, meeting d4 head-on. After ...c5 and the exchanges on d4 or c5 you reach a symmetrical, comfortable position where your pieces have room and White's small space edge means nothing. The lesson: the cramped side seeks exchanges, and ...Ne4 forces exactly the right ones at the right moment. Trade, breathe, then break with ...c5.

13You are White and you have just played the modest h3 in the Ruy. It develops nothing. Explain, in full, what prophylaxis is and exactly which of Black's ideas this one quiet move prevents.

Model answer

Prophylaxis is preventing the opponent's plan before you pursue your own, asking on every move not only what you want but what HE wants, and quietly stopping it. Here h3 does no developing at all, and that is the point: it prevents ...Bg4, which would pin your f3-knight to the queen and pressure your centre and king-side just as you want to play d4 and manoeuvre the knight. By spending one move to deny Black the g4-square, you make all your future plans run smoothly. The greatest players are known for exactly these unshowy moves. Before your own plan, kill his; a move that prevents can be worth more than a move that attacks.

14A bishop ending, White a pawn to the good. Judge the two bishops: which is good and which is bad, why, and how the better bishop is turned into the full point. Give the plan.

Model answer

White's bishop is the good one and Black's is bad, and the pawns tell you why. Black's pawns on d6, e6, f6 and h6 are fixed on light squares, the colour of his own bishop, so it is hemmed in behind them, a tall pawn. White's bishop enjoys open diagonals. With an extra pawn and the better bishop, White is winning, and the method is the principle of two weaknesses: fix Black's pawns further on light squares, create a second front with the b-pawn majority, and invade with the king on the dark squares Black's bishop can never guard. The whole game is decided by the difference in the bishops, so keep yours good and freeze his bad.

15Material is level, but Black is eyeing the ...Rxc3 exchange sacrifice against your queenside. Explain when the positional exchange sacrifice is worth a whole rook, and judge whether it works here.

Model answer

The positional exchange sacrifice, rook for a minor piece, is worth it when in return you gain lasting compensation: a shattered enemy structure, a dominant knight on a hole the rook can never challenge, a colour complex, or a raging attack. Here ...Rxc3 bxc3 would double and weaken White's queenside pawns, but with the position simplified and no concrete target, the compensation is not enough, and White, left up the exchange with the better minor-piece play and the safer structure, stands clearly better. The judgement is always the same: count not the material but the compensation, and ask whether it is permanent. A rook given for a permanent bind is a bargain; given for a fleeting one, a blunder.

16You are Black in the Classical Caro-Kann, a rich middlegame with the kings about to castle on opposite wings. The hardest positional skill is choosing which pieces to trade. State the rule, and which trades help you here.

Model answer

The rule: trade off your opponent's good pieces and your own bad ones, trade when you are cramped or under attack, and keep pieces when you are attacking or have more space. You have already made the key trade, exchanging your light-squared bishop, the traditional problem piece, off the board for White's good one. Now, with White castling long and pressing, trade a pair of knights when offered to blunt the king-side build-up, and keep your active pieces for the queenside counter-attack with ...c5 and ...b5-b4. The Caro structure is famously sound, so every good trade brings you closer to a safe, equal, and often preferable position. Trade the storm away, keep the counter-punch.

17You are White in the Sveshnikov Sicilian, and you have planted a knight on d5. Identify the key weak square, explain why it is permanent, and give the plan to make the outpost decisive.

Model answer

The weak square is d5, and it is permanent because Black's ...e5 removed the only pawn that could ever have guarded it: no black pawn will ever challenge a piece there again. The knight on d5 is a monster, hitting e7, f6, c7 and b6 and splitting Black's position. The plan is to entrench it, trade off any black knight that could exchange it (meeting ...Nxd5 with exd5, keeping the hole), press on the d6-pawn and the light squares, and use the outpost as the anchor for the whole game. An eternal knight on a central hole is often worth more than a bishop and decides both middlegame and ending. Find the hole, own the hole.

18You are Black in the Carlsbad, defending against White's minority attack. White is set for b4-b5. Give your full three-part counter-plan and where the game will be decided.

Model answer

Your play is on the king-side, where White has committed nothing, and the game is a race. Three parts: first restrain, slowing b4 with a timely ...a6 or ...a5; second re-route, bringing pieces to the king-side (...Nf8-g6, ...Nh5, ...Bd6, ...Qf6); third strike, with the ...f5-f4 pawn storm at White's king. White will create a weak c6-pawn with b5; you must generate your attack faster than he besieges it. Do not sit and defend c6 passively, that way lies a slow loss; counter-attack. The Carlsbad is two players sawing at opposite wings, and the calmer, faster attacker wins.

19You are Black in the Advance Caro-Kann, a sound but slightly cramped defensive position. Defence is precise calculation, not passivity. Give the defensive method and the counter you are aiming for.

Model answer

Sound defence begins with a clear head, not a flinch. Your position is solid: unlike the French, you got your light-squared bishop out to f5 before locking the centre, so it is a good piece, not a bad one. The method is to complete development calmly (...Ng6 or ...Nf5 to hit d4, ...Be7, ...O-O), keep every enemy line toward your king closed, and never make a loosening move under pressure. Your counter-play comes against d4, the base of White's chain: pile on it with ...Nc6, ...Qb6 and ...Nf5, and prepare the ...f6 break at the right moment. Precise defence is seeing the opponent's plan and quietly removing its fuel, then striking where you are strong.

20You are Black in the Winawer French, a razor-sharp position where White has grabbed two pawns on the king-side. Defence here means counterattack. Explain the plan and why you are not simply lost.

Model answer

This is the Poisoned Winawer, and it is famous precisely because Black's counterattack is worth the two pawns White has eaten on g7 and h7. You are not defending, you are racing: with ...cxd4 you rip open the centre and the c-file toward White's uncastled king, and you follow with ...Nbc6, ...Qc7 pressure and ...Rc8, throwing everything at c3 and c2. The principle: when your opponent goes pawn-grabbing on one wing, the answer is a counter-blow in the centre and on the other wing, not passive defence. Meet a flank raid with central fire. Count the race and attack; the initiative is worth more than the pawns.

21You are Black in the Queen's Gambit Accepted, and White has just struck with d5 to break the position open. The QGA's whole method is holding material loosely. Explain how you meet the break in that spirit.

Model answer

The QGA taught you the lesson this exercise tests: hold material with an open hand. You took the c4-pawn early not to keep it but to unbalance the game, and you have long since given it back for free development. Now meet d5 the same way: open with ...exd5 (or ...Nxd5 when it is safe), refusing to let White free his pawn on favourable terms, and welcome the opening of lines for your well-developed pieces, above all the b7-bishop raking the long diagonal. Never cling to a pawn when returning it completes your development or blunts the opponent's initiative. The greedy defender who clutches material through a storm loses everything; the wise one gives a little back and emerges safe and active.

22White to move, the exchange down and worse. Do not despair: hunt for the saving resource, and calculate that it is truly there rather than merely hoped for.

Model answer

Being worse is not being lost. White is the exchange down here, but the black king is airy, so the saving resource is a perpetual check or a fortress: the rook and pawns hold if White keeps the king safe and looks for repeated checks or an impregnable set-up rather than passively suffering. The defensive discipline: when you are worse, actively search for the draw, perpetual check, the fortress, stalemate, or giving material back, instead of drifting into a lost game. And calculate the drawing line to the end; a perpetual you only hoped for is a perpetual that was not there. Half a point rescued from a losing position is worth as much as any won game.

23White to move, a whole queen down, yet this holds. Explain what a fortress is and why White cannot be beaten here.

Model answer

A fortress is a drawn position the stronger side cannot break despite a big material deficit, because the defender's king and pawns form a wall the enemy cannot penetrate. Here, though Black has a queen for nothing, the pawns are locked (f4 against f5, h4 against h5) and White's king simply shuffles on the light squares. Black's king and queen can find no way in: any attempt to break through either allows stalemate or wins nothing, because the position has no open line to exploit. An engine confirms it: dead level. The lesson of defence at its deepest: when you are materially crushed, ask whether you can build a wall. Recognising a fortress, and steering into one, saves games that look hopeless on a material count.

24You are Black in a sharp Caro-Kann line where White has sacrificed a knight on e6 for a dangerous attack on your king. This is a genuine test: White has real compensation. State the defensive principles that give you the best chance to survive and consolidate.

Model answer

When you have accepted a sacrifice and your king is under fire, honesty first: White has real compensation here for the piece, so you are not winning yet, you are defending, and one careless move loses. The defence follows firm principles. First, do not be greedy: be ready to return some material at the right moment to blunt the attack and complete development. Second, trade attackers, because every piece you exchange is one fewer aimed at your king. Third, cover the key squares and find safety for the king before the blow lands, defending one move early rather than one move late. Fourth, look always for the counter-blow that turns defence into attack. Calculate the opponent's every check and capture to the quiet position before you trust a defence. Survive the storm and consolidate, and the extra piece will tell in the end; but the storm must be weathered first.

25Rook and a rook's pawn against rook, the Vancura drawing method for the defender. Explain how Black draws even though White's pawn is already rolling, and why the method works.

Model answer

The Vancura draw. The defender attacks the a-pawn from the SIDE along the third rank (the rook swings to a square like f3 or h3, hitting the pawn from the flank) while keeping his king near the g7/h7 corner, the corner the a-pawn does NOT promote into. From the side the rook stops the pawn advancing without ever being tied passively in front of it, and it keeps checking the white king from the flank whenever it approaches to shelter the pawn. Because it is a rook's pawn, the attacking king can never both escape the checks and shepherd the pawn home, so the position is a draw. Rook endings are drawish precisely because of such methods; know Vancura, the Philidor and the Lucena and you will save the endings others lose.

26Rook against two connected passed pawns supported by their king. Judge the race, and state the rule for rook against connected passers.

Model answer

The rule: two connected passed pawns supported by their king are very dangerous, and once they safely reach the sixth rank they beat a lone rook, because the rook cannot stop both. Below the sixth, the rook usually rounds them up if its own king can hurry back to help. Here the pawns are only on the fourth rank and White's king is close enough to assist, so with active play, attacking the pawns from behind or the side and bringing the king, White holds and can win the pawns. Judge such races to the exact tempo, because one move decides them, and never assume the rook automatically wins or the pawns automatically queen. Count, then act.

27Opposite-coloured bishops (White's light, Black's dark), with a pair of rooks still on the board. Explain why this is completely different from the pure opposite-bishop ending, and which side wants to keep the rooks.

Model answer

Opposite-coloured bishops are famously drawish when alone, but with ROOKS still on they become one of the sharpest winning attempts in chess. The reason: the bishop that rules one colour is, in effect, a permanent extra attacker on that colour, and with rooks to support it the stronger side attacks on squares the enemy bishop can never defend. So the usual advice reverses: here the ATTACKER wants to keep the rooks on and create threats on his bishop's colour, while the DEFENDER wants to trade rooks and head for the drawish pure-bishop ending. Know which side of that you are on. With opposite bishops, trading the rooks is the defender's goal and the attacker's mistake.

28A king-and-pawn ending, two pawns to the good, where one weakness is not enough. Show how White wins by the principle of two weaknesses and the outside passed pawn.

Model answer

White wins by creating a second front. The first asset is the queenside majority: advance with b4, a4 and b5 to manufacture an outside passed pawn far from the kings. That passer is weakness number one, and it decoys the black king to the queenside to stop it. While the black king is dragged away, the white king marches to the king-side and devours the pawns there, weakness number two. No defence can guard both wings at once. The principle of two weaknesses is the engine of nearly every winning endgame: one target the defender holds, so you make a second and shuttle between them faster than he can cover both. Make the outside passer, decoy the king, then win on the far wing.

29The Lucena position, the most important winning method in rook endings. Pawn on the seventh, your king in front, the enemy king cut off. Describe how to win by building a bridge.

Model answer

Build a bridge, and this is a forced win. Your king shelters in front of the pawn on b8, but if it simply steps out the black rook checks it endlessly, so you construct a shield. First, lift your rook to the fourth rank (Rf2-f4). Then walk your king out toward the pawn (Kb8-c7); when the black rook checks from the side, you march the king toward it (Kc6, Kd5) until, at the crucial check, your rook interposes on the fourth rank, blocking the check and sheltering the king. That rook is the bridge the king crosses, and now the pawn queens. Every strong player knows Lucena cold; drill it until the bridge is automatic, because it is the ending you must convert to turn extra pawns into wins.

30A rook ending, White a pawn down. The single most important principle in rook endings decides whether White holds. Name it, and explain the drawing method.

Model answer

Activity. In rook endings an active rook is worth far more than a pawn, and the golden rule is to keep your rook active at almost any cost and never passive. Here White, a clean pawn down, holds the draw by activity: the rook must swing behind or beside Black's pawns and harass them, and the king must stay near the action, so that Black can never both shepherd his extra pawn and shield his king from the rook. The losing move would be to pull the rook back to guard passively; the drawing move is to counter-attack Black's weaknesses. For the stronger side the same rule applies in reverse: activate the rook first, win pawns second. Passive rook, lost ending; active rook, saved ending. Activity above material.