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Ivanchuk surprised his opponent by playing 11...d5!
It is amazing that this impressive move has been played more than 200 times since this game in 2003!
It is clear that 12.cxd5 is not possible as the Nc3 is shaking and if 12.exd5 Nxd5! 13.Nxd5 e6 regains the piece.
12.Nxd5 can be met with the strong 12...e6! when after 13.Nxf6 (13.Ne3 Nxe4) 13...Bxf6 14.Be3 Rd8 15.Nc2 Qe7 and Bxa1 white's compensation is insufficient.
⚪️ #67 (Strategy - White To Move)
🔸Ivanchuk,V - Moskalenko,V
🔸1988
📕 #67

13.Rf2! Unpins the knight and plans to play h3, g4, Rg2 and Ng3 to launch an attack on the kingside. From the second rank white's rook is keeping an eye on the c2 square to make an intrusion from c2 even harder for black.
13.a3 unnecessarily weakens b3 and c4. Exchanging the bishops by 13.Bd3 is also dubious as after h3 and g4 white's bishop seems stronger than Ba6.
⚫️ 68 (Strategy-Black to Move)
🔸Nikolic,Pr - Ivanchuk,V
🔸Tilburg, 1990
📕 #68

11...c4!

Considering that the white's pawn majority can hardly become a mobile pawn center due to the misplaced knight on f3, black starts pushing his own pawn majority to create a passed pawn on the queenside. 11...b6 is a positional mistake, as it shuts off his own queen, so white can start an attack on the other side of the board by Nh4.
🔴 #34

An.Karpov - G.Kasparov (1990)
⚫️ 69 (Strategy-Black to Move)
🔸Kalantar,A - Petrosian,Tigran V
🔸ARM-ch Yerevan 1946
📕Unity Chess Multiple Choice 69

C: Ne5 – 17
👍👍👍👍👍👍👍 63%

A: Re8 – 5
👍👍 19%

B: a6 – 5
👍👍 19%

👥 27 people voted so far.
⚫️#70 (Strategy-Black to Move)
🔸Petrosian,Tigran V - Spassky,Boris Vasilievich
🔸World-ch26-Moscow-1969
📕Unity Chess Multiple Choice 70

A: Qb6 – 24
👍👍👍👍👍👍👍 71%

C: Qd6 – 6
👍👍 18%

B: Bg6 – 4
👍 12%

👥 34 people voted so far.
USSR Chess Team 1954
(Smyslov, Bronstein, Keres, Botvinnik)
⚪️ #65 (Strategy - White To Move)
📕 #65
The threat on d5 is not so serious yet!
12.Re1! Simply develops a piece. Now white can respond 12...cd5 by 13.ed5! ed5 14.Bf3 retaking the pawn. Instead of 12.Re1, Taking on c6 is possible but it is preferable to keep spatial advantage. 12.Bf3 to protect d5 is unnecessary and wastes a tempo. In addition, the bishop on f3 is vulnerable to attack by Nd7-e5 in future.
⚫️ 69 (Strategy-Black to Move)
🔸Kalantar,A - Petrosian,Tigran V
🔸ARM-ch Yerevan 1946
📕 #69

In this position, due to white's spatial advantage, most exchanges favor black. Black exchanges Bc8 by means of a nice typical tactic.
1...Ne5! 2.b3 Bh3!
⚫️#70 (Strategy-Black to Move)
🔸Petrosian,Tigran V - Spassky,Boris Vasilievich
🔸World-ch26-Moscow-1969
📕 #70
1...Bg6! With the idea of manuvering the knight to the weakened f4 square.
🔴 #34

A.Shirov - D.King (1990)