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The Isolated Pawn
Acceptable Isolani (1 of 2)

Point Count Chess, NO.189, p269
Burn v. Tarrasch, 1911

In this example, Black's e-Pawn becomes the Acceptable Isolani, on the d-file. Its position gives Black's Pieces cover to move about with greater freedom and security (especially in the case of Black's light-Bishop). Black also uses his Isolated d-Pawn to Cramp White's development.

At no point does White manage to take-out Black's Isolated d-Pawn, which remains steadfast in White's territory, at the point when White resigns, and reinforcing its status as an Acceptable Isolani.

Beneath the ChessFlash viewer, you'll find my analysis of the position featured in Point Count Chess:
  1. PCC, p.269 No.189, after 8.Nxc3
  2. Result of an Acceptable Isolani (1 of 2).
  3. Summary of an Acceptable Isolani (1 of 2).
  4. PGN

Acceptable Isolani (1 of 2)
My Analysis

Position #1, My Analysis
PCC, p.269 No.189, after 8.Nxc3

After: 1.e4 c5 2.Nc3 e6 3.Nf3 Nc6 4.d4 cxd4 5.Nxd4 Nf6 6.Ndb5 Bb4 7.a3 Bxc3+ 8.Nxc3

Point Count Chess - IE - Diagram 189 - Page 269
After: 8.Nxc3

1. How Black's e-Pawn becomes an Acceptable Isolani, on the d-file

Point Count Chess - IE - Diagram 189 - The Isolated Pawn, Acceptable Isolani (1 of 2), After 1.e4 to 4.d4
The Isolated Pawn,
Acceptable Isolani (1 of 2),
After 1.e4 to 4.d4
After 1.e4 to 4.d4, White's d-Pawn is developed to attack Black's c5-Pawn (1...c7-c5 vs. 4.d2-d4).
A common theme, when a Pawn becomes Isolated on the d-file, is Black's e-Pawn at e6 (as also seen in No.71A, No.72A, No.73, No.74, No.76 & No.77).
Point Count Chess - IE - Diagram 189 - The Isolated Pawn, Acceptable Isolani (1 of 2), After 4...cxd4 5.Nxd4
The Isolated Pawn,
Acceptable Isolani (1 of 2),
After 4...cxd4 5.Nxd4
After 4...cxd4 5.Nxd4, Black's c-Pawn leads the exchange of Pawns, on d4 (4...c5xd4), with White's King Knight completing the trade (5.Nf3xd4).
Point Count Chess - IE - Diagram 189 - The Isolated Pawn, Acceptable Isolani (1 of 2), After 5...Nf6 and 6...Bb4
The Isolated Pawn,
Acceptable Isolani (1 of 2),
After 5...Nf6 & 6...Bb4
After 5...Nf6 & 6...Bb4, Black prepares to Castle Kingside, in the process combining to attack vulnerable White units (e4-Pawn & Nc3), as his two Kingside Minor Pieces are developed.

Black's King Knight (Nf6) attacks White's e4-Pawn, as it's developed (5...Ng8-f6).

Black's King Bishop (Bb4) attacks and Pins White's Nc3, as it's developed (6...Bf8-b4).

The Knight's paralysis effectively removes its support of White's e4-Pawn, which is now vulnerable to Black's Nf6.
Point Count Chess - IE - Diagram 189 - The Isolated Pawn, Acceptable Isolani (1 of 2), After 7.a3 Bxc3+ 8.Nxc3
The Isolated Pawn,
Acceptable Isolani (1 of 2),
After 7.a3 Bxc3+ 8.Nxc3
After 7.a3 Bxc3+ 8.Nxc3, the advancing attack by White's a-Pawn (7.a2-a3) appears to force Black into exchanging his light-Bishop for White's Nc3 (7...Bb4xc3+ 8.Nb5xc3).
Point Count Chess - IE - Diagram 189 - The Isolated Pawn, Acceptable Isolani (1 of 2), After 8...d5 9.exd5 exd5
The Isolated Pawn,
Acceptable Isolani (1 of 2),
After 8...d5 9.exd5 exd5
After 8...d5 9.exd5 exd5, Black's e-Pawn becomes the Isolated Pawn, on the d-file.

Following immediately on from the Bishop-Knight exchange on c3, Black appears to force White to exchange Pawns on d5, with the attacking advance of his d-Pawn (8...d7-d5 9.e4xd5).

Black's e-Pawn becomes Isolated on the d-file, as it completes the trade (9...e6xd5).

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The Result of an Acceptable Isolani (1 of 2)...

2. Why Black's Isolated d5-Pawn is an Acceptable Isolani

Point Count Chess - IE - Diagram 189 - (RESULT) The Isolated Pawn, Acceptable Isolani (1 of 2), After 9...exd5
(RESULT) The Isolated Pawn,
Acceptable Isolani (1 of 2),
After 9...exd5
After 9...exd5, Black gains greater space for his Pieces. In particular, Black's light-Bishop gets the benefit of increased mobility, as a result of his e-Pawn becoming Isolated onto d5 (9...e6xd5). Subsequent play shows Black's light-Bishop making the most of its greater freedom ...
Point Count Chess - IE - Diagram 189 - (RESULT) The Isolated Pawn, Acceptable Isolani (1 of 2), After 11...Bg4 12.f3
(RESULT) The Isolated Pawn,
Acceptable Isolani (1 of 2),
After 11...Bg4 12.f3
After 11...Bg4 12.f3, supported by Black's Nf6, Black's light-Bishop attacks White's exposed Queen (11...Bc8-g4), forcing White to weaken the Pawn Guard surrounding his Kingside Castled King, as his f-Pawn is advanced (12.f2-f3) to protect its Queen.
Point Count Chess - IE - Diagram 189 - (RESULT) The Isolated Pawn, Acceptable Isolani (1 of 2), After 12.Be6
(RESULT) The Isolated Pawn,
Acceptable Isolani (1 of 2),
After 12.Be6
After 12.Be6, Black's light-Bishop retreats from White's f3-Pawn attack, stopping where it can provide support for Black's Isolated d5-Pawn (12.Bg4-e6).

Black soon disposes of his light-Bishop, to trade White's last Knight off the board (15.Nc3-e4 Be6-f5 » 16...Bf5xe4 17.f3xe4).

3. Black's Isolated d-Pawn can be pushed, to Cramp White's Development.

Point Count Chess - IE - Diagram 189 - (RESULT) The Isolated Pawn, Acceptable Isolani (1 of 2), After 13.Re1 Re8 14.Qd2
(RESULT) The Isolated Pawn,
Acceptable Isolani (1 of 2),
After 13.Re1 Re8 14.Qd2
After 13.Re1 Re8 14.Qd2, both Rooks are brought to the Open e-file (13.Rf1-e1 Rf8-e8), with Black's Rook being able to take advantage of the Be6, to shield it.

White's Queen (14.Qd1-d2) forms a Battery with the dark-Bishop (Bc1), along the c1-h6 diagonal.

Along with White's light-Bishop (Bd3), which targets Black's h7-square, White appears to be gearing up for an offensive against Black's King and his Pawn Guard.
Point Count Chess - IE - Diagram 189 - (RESULT) The Isolated Pawn, Acceptable Isolani (1 of 2), After 14...d4 15.Ne4
(RESULT) The Isolated Pawn,
Acceptable Isolani (1 of 2),
After 14...d4 15.Ne4
After 14...d4 15.Ne4, Black pushes his Isolated d-Pawn (14...d5-d4), which attacks White's Nc3, forcing it to flee (15.Nc3-c4).

Supported by his Nc6 and Qd8, Black's Isolated Pawn Cramps White's development, at c3 & e3.
Point Count Chess - IE - Diagram 189 - (RESULT) The Isolated Pawn, Acceptable Isolani (1 of 2), After 40...Qc6
(RESULT) The Isolated Pawn,
Acceptable Isolani (1 of 2),
After 40...Qc6
After 40...Qc6, White resigns.

At no point has White managed to take-out Black's Isolated d-Pawn, reinforcing its status as an Acceptable Isolani.

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Summary of an Acceptable Isolani (1 of 2)...

  1. Black's e-Pawn becomes an Acceptable Isolani, on the d-file. Black's e-Pawn is advanced to e6, very early in the Opening phase (1.e2-e4 c7-c5 2.Nb1-c3 e7-e6). Black subsequently leads the exchange of his c5-Pawn for White's d4-Pawn (4...c5xd4 5.Nf3xd4), and then appears to force White to exchange Pawns on d5, with the attacking advance of his d-Pawn (8...d7-d5 9.e4xd5). Black's e-Pawn becomes Isolated on the d-file, as it completes the trade (9...e6xd5).

  2. Black's Isolated d5-Pawn is an Acceptable Isolani, because Black gains greater space for his Pieces. In particular, Black's light-Bishop gets the benefit of increased mobility, as a result of his e-Pawn becoming Isolated on d5.

  3. Black's Isolated d-Pawn can be pushed into an Advanced position (14...d5-d4), to Cramp White's development, at c3 & e3.

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PGN

[Event "San Sebastian (Spain)"]
[Site "it"]
[Date "1911.??.??"]
[EventDate "?"]
[Round "?"]
[Result "0-1"]
[White "Amos Burn"]
[Black "Siegbert Tarrasch"]
[ECO "B45"]
[WhiteElo "?"]
[BlackElo "?"]
[PlyCount "80"]

1.e4 c5 2.Nc3 e6 3.Nf3 Nc6 4.d4 cxd4 5.Nxd4 Nf6 6.Ndb5 Bb4 7.a3 Bxc3+ 8.Nxc3 {PCC p.269 No.189} d5 9.exd5 exd5 10.Bd3 O-O 11.O-O Bg4 12.f3 Be6 13.Re1 Re8 14.Qd2 d4 15.Ne4 Bf5 16.Qf4 Bxe4 17.fxe4 Ne5 18.Qh4 Qb6 19.Bg5 Nfd7 20.b4 Rac8 21.Bd2 Nxd3 22.cxd3 Ne5 23.Qg3 Qa6 24.b5 Qxb5 25.Bh6 Ng6 26.Bd2 Rc2 27.Bb4 Ne5 28.Red1 Re6 29.Rac1 Qc6 30.Rb1 Qc7 31.Bd2 Rg6 32.Qh3 h6 33.Kh1 Ng4 34.Kg1 b6 35.Rdc1 Nxh2 36.e5 Ng4 37.Bf4 Nxe5 38.Kh1 f6 39.Qe6+ Kh7 40.Qf5 Qc6 0-1

End.

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