Chess basics stress on the exchange of pieces in two situations, firstly when the player enjoys material gain either in the form of a piece or even a pawn and secondly when a player has positional supremacy. As for the opponent, he has to try to keep pieces on board to make the game complicated and try for counter chances.
In the game which follows, Black wins a pawn and then tries to force as many exchanges as possible, beginning with the queen. White tries to resist but goes in for exchange when he has no choice.
Black then slowly also gets a positional edge and forces an ending where his extra pawn decides the game in his favour.
White: Victor Ciocaltea – Black: Viktor Korchnoi
Bucharest, 1954
Sicilian Defence
1.e4 c5
The Sicilian defence is a sharp response to the King pawn Opening and leads to an open game
2.Nf3 Nc6 3.d3
The slow Sicilian
3. ..g6 4.g3 Bg7 5.Bg2 Nf6 6.0–0 d5 7.Nbd2 0–0 8.c3 e6
This is not one of the very popular continuation in Sicilian defence
9.Re1 b6
Finachettoing on both sides
 10.e5
A first advance into enemy territory
10. ..Nd7 11.d4 f6
He wants to open up the position. If 11...Qc7 12.Nf1 c4 Nf7 23.Nxf7 Qxf7 24.Rae1
12.exf6
If 12.Bh3 fxe5 13.Bxe6+ Kh8 14.Bxd5 Bb7 15.dxe5 Ndxe5 16.Be4 Qf6 17.Nxe5 Qxf2+ 18.Kh1 Bxe5 19.Bg2 Qf5
12...Qxf6 13.Nf1
A bad move! Where is the knight headed?
If 13.Qe2 Bb7 14.dxc5 Nxc5 15.Nb3 Ba6 16.Qe3 Ne4 17.Nbd2 Nc5 18.Nb3 Ne4 19.Nbd2 Nxd2 20.Bxd2 e5 21.Ng5 Rad8 22.f4 e4 23.Nh3 Rfe8 24.Nf2 with black in a winning position happened in a previous game with Korchnoi playing black
13...cxd4 14.Bg5 Qf7 15.cxd4 Nxd4 16.Nxd4 Qxf2+
The queen has come too close for comfort
17.Kh1
Diagram 1
17. ..Qxd4
With an extra pawn, black is ready to trade queens. If 17...Bxd4 18.Ne3 Bxe3 19.Bxe3 Qf7 20.Bh6 Re8 21.Bxd5! Rb8 22.Qd4 Bb7 23.Bxb7 Rxb7 24.Rf1 Qe7 25.Rae1
18.Rxe6 Bb7 19.Re7
Entering the crucial seventh rank. If 19.Rd6 Nc5! 20.Qxd4.Bxd4 21.Bxd5+ Bxd5+ 22.Rxd5 Bxb2 with Black in a better position
19...Rf7 20.Rxf7 Kxf7 21.Ne3 Nc5 22.Qxd4 Bxd4 23.Bxd5+ Bxd5+ 24.Nxd5 Bxb2 25.Rf1+ Kg8 26.Re1 Rb8
Difficult to understand this move. If 26...Rf8 27.Re7 (27.Bh6 Bg7) 27...Rf5
 27.Re7
f 27.Re2 Ba3 28.Re7
27...Rd8
A good file to control but he lost one move . If 27...Rb7 28.Rxb7 Nxb7 29.Ne7+ Kf7 30.Nc8
28.Nf6+ Bxf6 29.Bxf6 Rd7
With a extra pawn in the ending, Black’s intentions of trying to exchange pieces is sound
30.Re2 Kf7 31.Bg5 Nd3 32.Kg2 b5 33.Kf1 a5 34.Rc2 Nb4 35.Rc5 Rd5 36.Rxd5 Nxd5 37.Bd2 Nb4 38.Ke2 Ke6 39.a3 Nc6 40.Kd3 Kd5 41.h3 b4 42.axb4 Nxb4+ 43.Kc3 Ke4 44.Kc4 Kf3 45.Bf4 Kg2 46.h4 h5 47.Bc7 Nc2
If 47...Nc6? 48.Kd5! Ne7+ 49.Ke6 Nf5 50.Kf6 a4 51.Kxg6 Nxg3 52.Be5 Kh3 53.Kg5 leads to an equal position
48.Bxa5
If 48.Kd5 a4 49.Ke6 a3 50.Be5 a2 51.Kf6 Kh3 52.Kxg6 Kg4 gives advantage to Black
48...Kxg3
If 48...Ne3+ 49.Kd3 Nf5
49.Kd3 Na3 50.Bd8 Nb5 51.Be7 Na7 52.Ke4 Nc8 53.Bc5
If 53.Bg5 Nd6+ 54.Kd5 Nf5 55.Ke6 Nxh4 56.Kf6 Kg4–+ 57.Bc1 Nf3! 58.Kxg6 h4 59.Ba3 Ne5
53...Kxh4
White is two pawns down now and the game is virtually lost as the bishop cannot handle both the pawns as the knight is also on board.
54.Kf3 Kg5 55.Kg3 Kf6 56.Bd4+ Kf5 57.Bc5 Ke5 58.Kh4 Kf4 59.Kh3 g5 60.Kg2 g4 61.Kf2 h4 62.Kg2 h3+ 63.Kh2 Kf3 64.Kg1 g3 65.Kh1 Ke2 66.Kg1 h2+ and White resigned.
Diagram 2
White to play and win
 1.Bg5 g1Q 2.Bxf6+ Qg7 3.Bxg7+ Kg8 4.Be5 and White wins
Manisha Mohite