In this position, we have a King's Indian Defence with the variation being the Four Pawns Attack. The difference between normal positions from that variation and the specific one here is that White has his bishop on g5. This weakens the dark squares behind the pawns, and this drawback is excellently exploited by Nunn with the following move.
10...Nh5!
Obviously with the threat of ... h7-h6.
11.Qf3 f6 12.Bh4 Nxf4 13.Qxf4 g5=/+.

⚫️#408 (Strategy-Black to Move)
🔸Gruenfeld,Y
🔸Svidler,P
🔸Haifa, 1995

For Black it is important that he justifies putting the bishop on b4, otherwise, he is simply lagging behind in development. Moreover, White's development lead will be used to organize an assault in the center or on the kingside (probably both), starting with e4-e5. The solution is to give White structural weaknesses and then prevent this advance.
10.Bxc3! 11.bxc3 e5!
The simplest way to prevent e4-e5. Note that this fits in well with ... Bxc3 as there is now no Nc3-d5 to look out for.
12.c4 exf4 13.Bxf4 d6 14.Kh1 Ng4! 15.Be2 Nge5=

⚫️#409 (Strategy-Black to Move)
🔸Svidler,P
🔸Sakaev,K
🔸St Petersburg, 1995

Unity Chess Multiple Choice 409

B: g5 – 4
👍👍👍👍👍👍👍 50%

A: Nc6 – 2
👍👍👍👍 25%

C: Ne5 – 2
👍👍👍👍 25%

👥 8 people voted so far.

⚪️#410 (Strategy-White to Move)
🔸Yakovich,Y
🔸Solozhenkin,E
🔸St Petersburg, 1995

Unity Chess Multiple Choice 410

A: Qd2 – 7
👍👍👍👍👍👍👍 70%

B: B×c5 – 2
👍👍 20%

C: B×f4 – 1
👍 10%

👥 10 people voted so far.

The 2018 Women's World Chess Championship is an upcoming match between Tan Zhongyi , the 2017 Women's World Chess champion , and her challenger Ju Wenjun . Ju Wenjun qualified by winning the FIDE Women's Grand Prix 2015–16 .
The match is played from 2 to 20 May 2018 and will be played in two halves, the first in Shanghai, the latter in Chongqing .

Schlechter vs Dr. Tarrasch in 1911.

@UnityChess

As a rule, the more mistakes there are in a game, the more memorable it remains, because you have suffered and worried over each mistake at the board.

🔹 Viktor Korchnoi

@UnityChess

Marcel Duchamp playing with US chess master Larry Evans, Southbury, Connecticut, 1956.

@UnityChess

Schiphol, 6th May, 1968. Viktor Korchnoi, photographed immediately after his arrival in The Netherlands, ahead of his FIDE Candidates' Quarter-final v. Sammy Reshevsky in Amsterdam.

@UnityChess

International master (later grandmaster) Hans Ree, at the demonstration board during the 5th match-game Reshevsky-Korchnoi, Candidates Quarter-final, Amsterdam, 15th May 1968.

@UnityChess