[Event "USA-op"]
[Site "USA"]
[Date "1956"]
[White "Fischer, Robert James"]
[Black "Lapiken, Peter Petrovich"]
[Result "1-0"]
[ECO "A07"]
[EventDate "1956"]

1.Nf3 
{A04 King's Indian Attack. With the King's Indian opening, White retains the option of various second Pawn moves.
However, Black is allowed to develop at leisure.} 
1...Nf6 
{A04 King's Indian Attack / Symmetrical Variation. It is simply not possible to evaluate this position. It is like a
blank piece of paper, yet to be written upon. The game may evolve in too many ways at this point to formulate an evaluation. It
is easier to list what openings are ruled out as a result of these moves, than deal with the possibilities still remaining.} 
2.g3 
{Planning the compact development Bg2, O-O before playing in the center. The King's Indian Attack.} 
2...d5 3.Bg2 
{A07 King's Indian Attack / Barcza Opening.} 
3...Bf5 4.O-O 
{Out of Opening Book. d3 would have been in the King's Indian Attack / Barcza Opening book opening.} 
4...e6 5.d3 
{A07 King's Indian Attack / Barcza Opening (transposed).} 
5...c6 
{Out of Opening Book. h6 would have been in the King's Indian Attack / Barcza Opening opening line. } 
6.Nbd2 Na6 7.a3 Nc5 
{Moves it off the edge.} 
8.c4 b5 9.Nd4 
{Threatens Black's pawn at c6 and blocks Black's pawn at d5.} 
9...Qd7 
{Removes the threat on Black's pawn at c6 and clears the way for a queenside castle.} 
10.Nxf5 exf5 
{ Black wins a knight for a bishop. Material is even.} 
11.Nb3 h6 12.Be3 Ne6 13.Nd4 
{Attacks Black's pawn at f5 and blocks Black's pawn at d5.} 
13...g6 
{Removes the threat on Black's pawn at f5.} 
14.Qb3 Rb8 
{Pins own pawn at b5. Leads to 15.Nxc6 Qxc6 16.cxd5 Qd7 17.Qc3 Be7 18.dxe6 Qxe6 19.Qc6+ Kf8 20.Bxa7 Rd8 21.Bb6,
which wins a knight and a pawn for a knight and three pawns. Better is Bc5, leading to 15.Qc3 Nxd4 16.Bxd4 Bxd4 17.Qxd4 Qe7
18.cxb5 c5 19.Qc3 O-O 20.e3, which wins a bishop and a knight for a bishop, a knight, and a pawn.} 
15.Nxc6 
{Attacks Black's rook at b8 and isolates Black's pawn at d5.} 
15...Qxc6 
{Removes the threat on Black's rook at b8.} 
16.cxd5 
{Forks Black's queen and Black's knight at e6 and creates passed pawns on d5 and d3. For the moment
Black wins a knight for two pawns.} 
16...Nc5 
{Escaping fork. Slightly better is Qd7.} 
17.Qc3 
{Moves it to safety and pins Black's knight at f6.} 
17...Qd6 
{Leads to 18.Bxc5 Qd8 19.Bxa7 Rc8 20.Bb6 Rxc3 21.Bxd8 Kxd8 22.bxc3 Bd6 23.e3 Re8 24.Rab1, which wins a queen and a
bishop for a queen, a rook, a knight, and a pawn. Better is Qb6, leading to 18.b4 Qd8 19.bxc5 Bg7 20.c6 Rc8 21.Qe5+ Kf8 22.Bc5+
Kg8 23.Bxa7 Ne4, which loses a knight and a pawn. This was black's key blunder. Black was never able to recover and eventually
resigned.} 
18.Bxc5 
{Forks Black's queen and Black's pawn at a7.} 
18...Qxc5 
{Hangs the knight. Leads to 19.Qxf6 Bg7 20.Qxg7 Rf8 21.Rac1 Qe7 22.Qxh6 Rd8 23.d6 Qxd6 24.Qe3+ Qe6 25.Rc7 Qxe3
26.Bc6+ Rd7 27.Bxd7+ Kd8 28.fxe3 Kxc7 29.Bxb5, which wins a queen, a rook, a bishop, and a pawn for a queen, a rook, a bishop, a
knight, and two pawns. Better is Qd8, leading to 19.Bxa7 Rc8 20.Bb6 Rxc3 21.Bxd8 Kxd8 22.bxc3 Bd6 23.Rab1 Re8 24.e3, which wins
a queen and a bishop for a queen, a rook, and a pawn.} 
19.Qxf6 
{Threatens Black's rook at h8 and blocks Black's pawn at f7. White wins two knights for a bishop. White is ahead by two
pawns in material. Black resigns.} 
1-0

Pawn fork

White to move and win. C8 to get PGN.
This fork # 6.2 is explained in ebook Fork, a common chess pattern on Amazon.com , by Rodolfo Pardi.

For additional training on patterns, you can visit this page of mine: Patterns

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