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The Isolated Pawn
Acceptable Doubled Isolani (1 of 2)

Point Count Chess, NO.191, p271
Teichmann v. Tarrasch, 1894

In this example, Black incurs Doubled and Isolated Pawns, in the same structure (the Doubled Isolani), on the c-file.

A series of cumulative advantages (Bishop-pair; two Half-Open Files; and a lead in development) were deemed "ample compensation" that made Black's Doubled Isolani an Acceptable weakness.

Beneath the ChessFlash viewer, you'll find my analysis of the position featured in Point Count Chess:
  1. PCC, p.271, No.191, after 10...dxe5
  2. Result of an Acceptable Doubled Isolani (1 of 2).
  3. Summary of an Acceptable Doubled Isolani (1 of 2).
  4. PGN

Acceptable Doubled Isolani (1 of 2)
My Analysis

Position #1, My Analysis
PCC, p.271, No.191, after 10...dxe5

After: 1.e4 e5 2.Nc3 Nf6 3.Bc4 Bc5 4.f4 d6 5.Nf3 Nc6 6.d3 Bg4 7.h3 Be6 8.Bb5 a6 9.Bxc6+ bxc6 10.fxe5 dxe5

Point Count Chess - IE - Diagram 191 - Page 271
After: 10...dxe5

1. How Black incurs an Acceptable Doubled Isolani, on the c-file

Point Count Chess - IE - Diagram 191A and 191B - The Isolated Pawn, Acceptable Doubled Isolani (1 of 2), After 4.f4 d6
The Isolated Pawn,
Acceptable Doubled Isolani (1 of 2),
After 4.f4 d6
After 4.f4 d6, White causes tension to develop between Black's e5-Pawn (1...e7-e5) and White's f4-Pawn (4.f2-f4), which results in Black's d-Pawn advancing to support the e5-Pawn (4...d7-d6).

This is significant to Black gaining the Isolated Pawn structure on the c-file, as Black's d-Pawn will be forced to leave the d-file, to complete the threatened Pawn exchange on e5.
Point Count Chess - IE - Diagram 191A and 191B - The Isolated Pawn, Acceptable Doubled Isolani (1 of 2), After 6...Bg4 to 8.Bb5
The Isolated Pawn,
Acceptable Doubled Isolani (1 of 2),
After 6...Bg4 to 8.Bb5
After 6...Bg4 to 8.Bb5, Black's light-Bishop comes out to make a nuisance of itself, first applying a temporary Pin against White's Nf3 (6...Bc8-g4), before fleeing from the advance of White's h-Pawn (7.h2-h3), to attack White's light-Bishop (7...Bg4-e6).

White's light-Bishop decides against the Bishop swap, instead countering with a Pin of its own, against Black's Nc6. This is significant, as it leads to Black incurring Doubled c-Pawns.
Point Count Chess - IE - Diagram 191A and 191B - The Isolated Pawn, Acceptable Doubled Isolani (1 of 2), After 8...a6 9.Bxc6+ bxc6
The Isolated Pawn,
Acceptable Doubled Isolani (1 of 2),
After 8...a6 9.Bxc6+ bxc6
After 8...a6 9.Bxc6+ bxc6, Black incurs Doubled Pawns, on the c-file.

Black's a-Pawn (8...a7-a6) appears to be the trigger that forces White to trade his light-Bishop for Black's Nc6 (9.Bb5xc6), which causes Black to incur Doubled c-Pawns, when his b-Pawn completes the trade (9...b7xc6).
Point Count Chess - IE - Diagram 191A and 191B - The Isolated Pawn, Acceptable Doubled Isolani (1 of 2), After 10.fxe5 dxe5
The Isolated Pawn,
Acceptable Doubled Isolani (1 of 2),
After 10.fxe5 dxe5
After 10.fxe5 dxe5, Black incurs the Doubled Isolated Pawn structure, on the c-file.

Without delay, White follows up the exchange on c6, with the Pawn exchange on e5 (10.f4xe5), which leaves Black's c-Pawns both Doubled and Isolated, as Black's d-Pawn completes the trade (10...d6xe5).

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

2. Why Black's Doubled Isolated c-Pawns are Acceptable

Point Count Chess - IE - Diagram 191 - (RESULT) The Isolated Pawn, Acceptable Doubled Isolani (1 of 2), After 10...dxe5
(RESULT) The Isolated Pawn,
Acceptable Doubled Isolani (1 of 2),
After 10...dxe5
After 10...dxe5, H&M-S reveal Tarrasch's verdict, of why he chose to accept Doubled Isolated Pawns, on the c-file ...

In exchange for the weak Pawn structure, Black gains:
H&M-S say: "Tarrasch considers this more than ample compensation, amounting almost to a won game."

3. How Black uses his key advantages, to win, despite having incurred the Doubled Isolated c-Pawns

Point Count Chess - IE - Diagram 191 - (RESULT) The Isolated Pawn, Acceptable Doubled Isolani (1 of 2), After 11...Qd6
(RESULT) The Isolated Pawn,
Acceptable Doubled Isolani (1 of 2),
After 11...Qd6
After 11...Qd6, Black takes advantage of the Half-Open d-file, by bringing out his Queen (11...Qd8-d6) to support the e5-Pawn.
Point Count Chess - IE - Diagram 191 - (RESULT) The Isolated Pawn, Acceptable Doubled Isolani (1 of 2), After 14...O-O and 15...f5 16.exf5 Bxf5
(RESULT) The Isolated Pawn,
Acceptable Doubled Isolani (1 of 2),
After 14...O-O » 15...f5 16.exf5 Bxf5
After 14...O-O » 15...f5 16.exf5 Bxf5, Black takes advantage of his lead in development, to Castle Kingside before White (14...O-O). This brings Black's Rook to the f-file, which in turn supports the attack by Black's f-Pawn on White's e4-Pawn (15...f7-f5), which in turn leads to the exchange of Pawns (16.e4xf5).

Black's Rf8 guards the f5-square, against the threat from White's Queen (Qd3), which enables Black's light-Bishop to safely complete the Pawn exchange (16...Be6xf5).
Point Count Chess - IE - Diagram 191 - (RESULT) The Isolated Pawn, Acceptable Doubled Isolani (1 of 2), After 17...e4 18.Nh2
(RESULT) The Isolated Pawn,
Acceptable Doubled Isolani (1 of 2),
After 17...e4 18.Nh2
After 17...e4 18.Nh2, Black takes advantage of one half of his Bishop-pair (light-Bishop), which supports the advance of Black's e5-Pawn, as it marches into an Advanced and Passed position (17...e5-e4), in White's territory.

Black's e4-Pawn drives away White's King Knight (18.Nf3-h2), and also Cramps White's further development, at d3 and f3.
Point Count Chess - IE - Diagram 191 - (RESULT) The Isolated Pawn, Acceptable Doubled Isolani (1 of 2), After 19.Bf4 Qd5
(RESULT) The Isolated Pawn,
Acceptable Doubled Isolani (1 of 2),
After 19.Bf4 Qd5
After 19.Bf4 Qd5, Black continues to take advantage of his Half-Open d-file, to continue the support of Black's Passed e4-Pawn, while also evading the attack by White's dark-Bishop (19.Be3-f4 Qd6-d5).
Point Count Chess - IE - Diagram 191 - (RESULT) The Isolated Pawn, Acceptable Doubled Isolani (1 of 2), After 20...O-O
(RESULT) The Isolated Pawn,
Acceptable Doubled Isolani (1 of 2),
After 20...O-O
After 20...O-O, we see how the other half of Black's Bishop-pair (dark-Bishop), has so far remained quietly on b6, seemingly doing very little.

However, its purposeful position is revealed as soon as White King Castles Kingside (20...O-O), and now Black's dark-Bishop is focused on the position of White's Kg1, along the a7-g1 diagonal.

4. Black uses his Doubled Isolated c-Pawns, to help Black's Passed e4-Pawn gain Promotion

Point Count Chess - IE - Diagram 191 - (RESULT) The Isolated Pawn, Acceptable Doubled Isolani (1 of 2), After 20...c5 21.Be3
(RESULT) The Isolated Pawn,
Acceptable Doubled Isolani (1 of 2),
After 20...c5 21.Be3
After 20...c5 21.Be3, Black's leading Doubled Isolani is advanced (20...c7-c5) to attack the head of White's Pawn Chain (d4). This forces White's dark-Bishop back onto the a7-g1 diagonal, in anticipation of an exchange of Pawns that will open the diagonal from Black's Bb6, down to White's Kg1.
Point Count Chess - IE - Diagram 191 - (RESULT) The Isolated Pawn, Acceptable Doubled Isolani (1 of 2), After 21...cxd4 22.cxd4
(RESULT) The Isolated Pawn,
Acceptable Doubled Isolani (1 of 2),
After 21...cxd4 22.cxd4
After 21...cxd4 22.cxd4, Black's Doubled Isolani is reduced to a single Isolated Pawn (Black's original c-Pawn), as the anticipated Pawn exchange takes place.

Black's c5-Pawn finishes the attack it started, capturing White's d4-Pawn (21...c5xd4), forcing White's c3-Pawn onto d4, as it completes the trade (22.c3xd4).
Point Count Chess - IE - Diagram 191 - (RESULT) The Isolated Pawn, Acceptable Doubled Isolani (1 of 2), After 22...c5 to 24.d5
(RESULT) The Isolated Pawn,
Acceptable Doubled Isolani (1 of 2),
After 22...c5 to 24.d5
After 22...c5 to 24.d5, Black's Isolated c-Pawn (his original c-Pawn) comes out to challenge White's replacement d4-Pawn (22...c7-c5), but White manages to evade this threat, countering with an attack on Black's Queen (23.Ne2-c3 Qd5-b7), before pushing his d-Pawn into an Advanced and Passed position of its own (24.d4-d5).

However, this has made it easier for Black to remove the blockade on his own Advanced and Passed e4-Pawn ...
Point Count Chess - IE - Diagram 191 - (RESULT) The Isolated Pawn, Acceptable Doubled Isolani (1 of 2), After 24...Bf5 to 31.Qd2
(RESULT) The Isolated Pawn,
Acceptable Doubled Isolani (1 of 2),
After 24...Bf5 to 31.Qd2
After 24...Bf5 to 31.Qd2, there's a period of play during which White forces the exchange of the adverse King Rooks (28.Rf1xf8+ Ra8xf8) and then forms his remaining Rook (30.Rf1-d1) and Queen (31.Qg2-d2) into Battery formation on the d-file, to try and take on Black's Strong Outpost Knight (Nd3).
Point Count Chess - IE - Diagram 191 - (RESULT) The Isolated Pawn, Acceptable Doubled Isolani (1 of 2), After 31...cxb3 32.axb3
(RESULT) The Isolated Pawn,
Acceptable Doubled Isolani (1 of 2),
After 31...cxb3 32.axb3
After 31...cxb3 32.axb3, Black disposes of his Isolated c-Pawn, to force an exchange of Pawns on b3 (31...c4xb3), which leaves White's a-Pawn Isolated on the b-file, as it completes the trade (32.a2xb3).
Point Count Chess - IE - Diagram 191 - (RESULT) The Isolated Pawn, Acceptable Doubled Isolani (1 of 2), After 32...Bxe3+ 33.Qxe3
(RESULT) The Isolated Pawn,
Acceptable Doubled Isolani (1 of 2),
After 32...Bxe3+ 33.Qxe3
After 32...Bxe3+ 33.Qxe3, Black trades dark-Bishops to help remove the blockade on his Passed Pawn (e4). However, it doesn't quite release Black's e4-Pawn, as White's Queen resumes the blockade, in the process of completing the exchange of dark-Bishops (32...Bb6xe3+ Qd2xe3).
It's at this point I want to draw attention to Black's Isolated a-Pawn, as it will soon become an Outside Passed Pawn.
Point Count Chess - IE - Diagram 191 - (RESULT) The Isolated Pawn, Acceptable Doubled Isolani (1 of 2), After 33...Qxb3 34.Qd4
(RESULT) The Isolated Pawn,
Acceptable Doubled Isolani (1 of 2),
After 33...Qxb3 34.Qd4
After 33...Qxb3 34.Qd4, Black forces White's Queen to remove her blockade on Black's Passed e-Pawn, as Black's a-Pawn becomes an Outside Passed Pawn.

Black's Queen captures White's Isolated b-Pawn (33...Qb7xb3), which turns Black's a-Pawn into the Outside Passed Pawn. It would appear this is enough of a threat to cause White's Queen to remove the blockade of Black's e4-Pawn (34.Qe3-d4), to guard the a4-square and stop Black's a-Pawn marching beyond the 5th Rank.
Point Count Chess - IE - Diagram 191 - (RESULT) The Isolated Pawn, Acceptable Doubled Isolani (1 of 2), After 34...e3
(RESULT) The Isolated Pawn,
Acceptable Doubled Isolani (1 of 2),
After 34...e3
After 34...e3, supported by Black's Re8, his Passed e-Pawn continues its march (34...e4-e3), edging ever closer toward its Promotion square (d1).
Point Count Chess - IE - Diagram 191 - (RESULT) The Isolated Pawn, Acceptable Doubled Isolani (1 of 2), After 35.Rxd3 to 36.Qxd3
(RESULT) The Isolated Pawn,
Acceptable Doubled Isolani (1 of 2),
After 35.Rxd3 to 36.Qxd3
After 35.Rxd3 to 36.Qxd3, White is forced to take drastic action, deliberately losing the exchange (35.Rd1xd3 Bg6xd3 36.Qd4xd3), to remove Black's Nd3, because of it was providing support to Black's e3-Pawn and its push for Promotion on d1.
Point Count Chess - IE - Diagram 191 - (RESULT) The Isolated Pawn, Acceptable Doubled Isolani (1 of 2), After 36...e2 37.Nf3 e1Q+
(RESULT) The Isolated Pawn,
Acceptable Doubled Isolani (1 of 2),
After 36...e2 37.Nf3 e1Q+
After 36...e2 37.Nf3 e1Q+, in successive moves, Black's Passed Pawn on the e-file gains Promotion (36...e3-e2 » 37...e2-e1Q+), with the resulting Queen attacking White's fully exposed King (Kg1).

But note the approach of White's King Knight (37.Nh2-f3) ...
Point Count Chess - IE - Diagram 191 - (RESULT) The Isolated Pawn, Acceptable Doubled Isolani (1 of 2), After 38.Nxe1 Rxe1+
(RESULT) The Isolated Pawn,
Acceptable Doubled Isolani (1 of 2),
After 38.Nxe1 Rxe1+
After 38.Nxe1 Rxe1+, White's King Knight is forced to capture Black's new Queen (38.Nf3xe1), enabling Black's Rook to take-out White's Knight (38...Re8xe1+), renewing the attack on White's King.

Black's extra Queen appears little more than a lure to remove White's King Knight (Nf3), which is a threat to Black's Kingside (combining with White's Queen) and a distraction from Black's ability to halt the march to Promotion of White's own Passed Pawn (d5).

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

  1. Black incurs an Acceptable Doubled Isolani, on the c-file. White causes tension to develop between Black's e5-Pawn (1...e7-e5) and White's f4-Pawn (4.f2-f4), which results in Black's d-Pawn advancing to support the e5-Pawn (4...d7-d6). Black first incurs Doubled Pawns, on the c-file, as White trades his light-Bishop for Black's Nc6 (9.Bb5xc6 b7xc6). Black then incurs the Doubled Isolated Pawn structure, on the c-file, as White follows up the exchange on c6, with the Pawn exchange on e5 (10.f4xe5 d6xe5).

  2. Black's Doubled Isolated c-Pawns are Acceptable, due to the cumulative advantages Black gains, including: the Bishop-pair; two Half-Open (b & d); and a lead in development.

  3. Black uses his cumulative advantages, to win, despite having incurred the Doubled Isolated c-Pawns:

    • The Half-Open d-file is used by Black's Queen, to support Black's e5-Pawn, which will be pushed into an Advanced position and converted into a Passed Pawn, headed for Promotion.

    • The lead in development is used by Black, to Castle Kingside before White . This brings Black's Rook to the f-file, which in turn supports the attack by Black's f-Pawn on White's e4-Pawn, which in turn leads to the exchange of Pawns.

    • The Bishop-pair both help Black's e5-Pawn to become a Passed Pawn. Black's light-Bishop, supported by the Castled Rf8, combines with its Queen, to helps escort Black's e5-Pawn down into the Advanced position (e4); Black's dark-Bishop lurks on b6, on the a7-g1 diagonal, and is eventually exchanged with White's dark-Bishop, to help remove one of the Pieces that's blockading Black's e4-Pawn, which by then has become the Passed Pawn.


  4. Black uses his Doubled Isolated c-Pawns, to help Black's Passed e4-Pawn gain Promotion. Black's leading Doubled Isolani is used to force an exchange of Pawns on d4, and the follow-up attack by Black's remaining Isolated c-Pawn (his original c-Pawn) helps to clear the a7-g1 diagonal, so that White's dark-Bishop can be removed from blockading Black's Passed e4-Pawn (an exchange of dark-Bishops sorts this). Meanwhile, Black's remaining Isolated c-Pawn is used to force an exchange of Pawns on b3, which leaves White's a-Pawn Isolated on b3. When Black's Queen takes-out this Isolani, it converts White's Isolated a-Pawn into an Outside Passed Pawn. Black's Passed e-Pawn is subsequently Promoted to a Queen, which appears solely to be a lure to take-out White's King Knight.

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PGN

[Event "DSB-09.Kongress"]
[Site "Leipzig"]
[Date "1894.09.03"]
[EventDate "?"]
[Round "4"]
[Result "0-1"]
[White "Richard Teichmann"]
[Black "Siegbert Tarrasch"]
[ECO "C26"]
[WhiteElo "?"]
[BlackElo "?"]
[PlyCount "84"]

1.e4 e5 2.Nc3 Nf6 3.Bc4 Bc5 4.f4 d6 5.Nf3 Nc6 6.d3 Bg4 7.h3 Be6 8.Bb5 a6 9.Bxc6+ bxc6 10.fxe5 dxe5 {PCC p.271 No.191} 11.Ne2 Qd6 12.d4 Bb6 13.Qd3 Nd7 14.c3 O-O 15.Be3 f5 16.exf5 Bxf5 17.Qd2 e4 18.Nh2 Be6 19.Bf4 Qd5 20.O-O c5 21.Be3 cxd4 22.cxd4 c5 23.Nc3 Qb7 24.d5 Bf5 25.b3 Ne5 26.g4 Bg6 27.Qg2 Nd3 28.Rxf8+ Rxf8 29.Rf1 Re8 30.Rd1 c4 31.Qd2 cxb3 32.axb3 Bxe3+ 33.Qxe3 Qxb3 34.Qd4 e3 35.Rxd3 Bxd3 36.Qxd3 e2 37.Nf3 e1=Q+ 38.Nxe1 Rxe1+ 39.Kf2 Re5 40.d6 Qb6+ 41.Kg2 Qc6+ 42.Kg3 Re6 0-1

End.

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