Doubled Pawns
The Pinned King Knight (2 of 2)

Point Count Chess, NO.67, p98
Maroczy v. Capablanca, 1926

This example shows Black's King Knight (Nf6) being Pinned by White's dark-Bishop, from g5. However, it also serves to highlight conditions that mean White's effort is wasted, in his play that forces Black to incur Doubled Pawns, on the f-file.

In addition, we see how Black can take advantage of the Half-Open g-file, which was created during the Doubling of Black's g- and f-Pawns.

Beneath the ChessFlash viewer, you'll find my analysis of the position featured in Point Count Chess:
1. PCC, p.98 No.67x, after 19...Qd8
2. Result of the Pinned King Knight (2 of 2).
3. Summary of the Pinned King Knight (2 of 2).
4. PGN

The Pinned King Knight (2 of 2)
My Analysis

Position #1, My Analysis
PCC, p.98 No.67, after 19...Qd8

After: 1.e4 c6 2.d4 d5 3.exd5 cxd5 4.Bd3 Nc6 5.c3 Nf6 6.Bf4 Bg4 7.Qb3 Na5 8.Qa4%2B Bd7 9.Qc2 Qb6 10.Nf3 e6 11.O-O Bb5 12.Nbd2 Bxd3 13.Qxd3 Rc8 14.Rab1 Be7 15.h3 O-O 16.Rfe1 Nc4 17.Nxc4 Rxc4 18.Ne5 Rcc8 19.Bg5 Qd8

After: 19...Qd8

1. How White loses too many Pieces, preventing White from being able to take advantage of the situation, when Black incurs Doubled f-Pawns.

 Doubled Pawns,The Pinned King Knight (2 of 2), After 12...Bxd3 13.Qxd3 After 12...Bxd3 13.Qxd3, White loses his light-Bishop, in an exchange forced by Black. White's light-Bishop had been in Battery formation, with its Queen, along the b1-h7 diagonal, targeting Black's h7-square, in anticipation of Black's King Castling Kingside (although it could also be an attempt to force Black to Castle Queenside). Black elected to get rid of White's light-Bishop, exchanging it with his own (12...Bb5xd3), in preparation for Castling Kingside (15...O-O).
 Doubled Pawns,The Pinned King Knight (2 of 2), After 16...Nc4 17.Nxc4 Rxc4 After 16...Nc4 17.Nxc4 Rxc4, White loses his Queen Knight, in an exchange forced by Black. It would appear Black's Knight, on the c4-Outpost (16...Na5-c4), was too much for White to tolerate, so White chose immediately to exchange his Nd2, to take-out Black's Knight (17.Nd2xc4). Black's Rc8, having already been posted to Black's Half-Open c-file, completes the trade (17...Rc8xd4), temporarily safeguarded from White's Qd3, by the d5-Pawn that's securing Black's c4-Outpost.

However, because of the threat from White's b2-Pawn, it will prove a short stay for Black's Rook -- indeed, it returns to its back rank, on the very next turn (18...Rc4-c8), without waiting to be attacked by White's b2-Pawn.

 Doubled Pawns,The Pinned King Knight (2 of 2), After 18.Ne5 » 19.Bg5 After 18.Ne5 » 19.Bg5, White relocates his Nf3, onto the e5-Outpost (18.Nf3-e5), before moving his dark-Bishop, a second time, to apply the Pin to Black's King Knight (19.Bf4-g5).
 Doubled Pawns,The Pinned King Knight (2 of 2), After 20.Bxf6 gxf6 After 20.Bxf6 gxf6, White loses his dark-Bishop, in the process of exchanging it to take-out Black's Nf6 (20.Bg5xf6). It happens in the same move that forces Black to incur Doubled Pawns, on the f-file, when Black's g-Pawn completes the trade (20...g7xf6).
White's Losses, as Black incurs Doubled Pawns...

In total, while causing Black to incur Doubled f-Pawns, White has lost:
• Both Bishops
• 1x Knight
I make note of these three White losses, as H&M-S say: "The open king knight file (g-file) certainly looks strong; Black can occupy it in two moves, while White does not have enough pieces left for a quick attack on the exposed king."

We see how Black takes advantage of the Half-Open g-file, in the Result (below).

The Result of the Pinned King Knight (2 of 2)...

 (RESULT) Doubled Pawns,The Pinned King Knight (2 of 2), After 20...gxf6 21.Ng4 After 20...gxf6 21.Ng4, the first benefit, for Black, when incurring Doubled f-Pawns (20...g7xf6), is it forces White's Knight to leave its vantage point, on the e5-Outpost (21.Ne5-g4). Black's f6-Pawn subsequently guards the e5-square, preventing White's Kg4 from returning, while Black's Pawn remains on f6.
 (RESULT) Doubled Pawns,The Pinned King Knight (2 of 2), After 21...Kh8 After 21...Kh8, Black begins the process of enabling his Rf8 to occupy the Half-Open g-file, by moving his King onto the h-file (21...Kg8-h8). Remember what H&M-S said: "The open king knight file (g-file) certainly looks strong; Black can occupy it in two moves ..." Well, here (left) is the first of those two moves, done. However, in reality, (or, at least in this game), Black spends a few more turns, before posting his Rf8 onto g8, at the base of his Half-Open g-file.
 (RESULT) Doubled Pawns,The Pinned King Knight (2 of 2), After 22...f5 23.Ne5 After 22...f5 23.Ne5, Black reduces the weakness of his Doubled f-Pawns, by advancing the vanguard f-Pawn (22...f6-f5), to its front line. While this allows White's Ng4 to return to the e5-Outpost (23.Ng4-e5), White's g2-Pawn is left Backward, on the Half-Open g-file, with Black's Rf8 about to apply frontal pressure. With White's King behind, White's Backward g2-Pawn will also become Pinned.
 (RESULT) Doubled Pawns,The Pinned King Knight (2 of 2), After 23...Bd6 » 24...Bxe5 25.Rxe5 After 23...Bd6 » 24...Bxe5 25.Rxe5, Black moves his dark-Bishop into position (23...Be7-d6), before exchanging it, to remove White's e4-Outpost Knight (24...Bd6xe5 25.Re1xe5), prior to posting his Rf8 onto the Half-Open g-file.
 (RESULT) Doubled Pawns,The Pinned King Knight (2 of 2), After 25...Rg8 After 25...Rg8, Black's Rf8 finally gets posted to the Half-Open g-file (25...Rf8-g8), applying frontal pressure against White's Pinned and Backward g2-Pawn. Black continues his Kingside Attack, from here. But, for this example, we've seen enough -- how Black makes best use of his situation, after having incurred Doubled Pawns, on the f-file.

Summary of the Pinned King Knight (2 of 2)...

1. White loses too many Pieces (2x Bishops & 1x Knight, preventing White from being able to take advantage of the situation, when Black incurs Doubled f-Pawns (20.Bg5xf6 g7xf6).

2. Black turns the usual weakness of the Doubled f-Pawns and Half-Open g-file, into his advantage:

1. Black's f6-Pawn (the vanguard of the Doubled Pawns) immediately displaces White's e5-Outpost Knight (21.Ne5-g4), albeit temporarily;

2. Black's f6-Pawn advances to its front line (22...f6-f5), intensifying the problem for White's g2-Pawn, which is in a Backward position;

3. After taking-out White's e5-Outpost Knight (23...Be7-d6 » 24...Bd6xe5 25.Re1xe5), Black posts his Rf8 onto the Half-Open g-file (25...Rf8-g8), applying frontal pressure against White's Pinned and Backward g2-Pawn. And, from here, Black continues with a Kingside attack, against White's weakened Pawn structure.

PGN

[Event "USA"]
[Site "it Lake-Hopatcong"]
[Date "1926"]
[EventDate "?"]
[Round "?"]
[Result "0-1"]
[White "Geza Maroczy"]
[Black "Jose Raul Capablanca"]
[ECO "B13"]
[WhiteElo "?"]
[BlackElo "?"]
[PlyCount "98"]

1.e4 c6 2.d4 d5 3.exd5 cxd5 4.Bd3 Nc6 5.c3 Nf6 6.Bf4 Bg4 7.Qb3 Na5 8.Qa4+ Bd7 9.Qc2 Qb6 10.Nf3 e6 11.O-O Bb5 12.Nbd2 Bxd3 13.Qxd3 Rc8 14.Rab1 Be7 15.h3 O-O 16.Rfe1 Nc4 17.Nxc4 Rxc4 18.Ne5 Rcc8 19.Bg5 Qd8 {PCC p.98 No.67} 20.Bxf6 gxf6 21.Ng4 Kh8 22.f4 f5 23.Ne5 Bd6 24.Qf3 Bxe5 25.Rxe5 Rg8 26.Re2 Qh4 27.Kh2 Rg6 28.g3 Qf6 29.Rg1 Kg7 30.Qd3 a6 31.Rc1 h5 32.h4 Kh6 33.c4 dxc4 34.Rxc4 Rxg3 35.Qxg3 Rxc4 36.Rd2 Qg6 37.Qg5+ Qxg5 38.hxg5+ Kg6 39.Kg3 Rc6 40.Kf3 Rd6 41.Kg3 f6 42.gxf6 Kxf6 43.Kf3 h4 44.Rh2 Rxd4 45.Rxh4 b5 46.Rh6+ Ke7 47.Rh7+ Kd6 48.Ra7 Ra4 49.a3 Kd5 0-1

End.