The key defender

by ChessBase
11/24/2025 – In his series ‘Practical Tips for Tournament Players’ in ChessBase Magazine, GM Jan Markos regularly addresses topics that are important for decision-making at the board. In the current issue of ChessBase Magazine #228, you can learn how to identify and eliminate the most important defensive piece in your opponent's position using selected examples. You can study Jan Markos' article – consisting of a 20-minute video and a small collection of exercises – for free this week as a CBM sample. Enjoy!

FIDE Grand Swiss 2025 with analyses by Giri, Blübaum and many others. Opening videos by Kasimdzhanov, Sokolov and Blohberger. Training columns including ‘The Fortress’, ‘The Trap’, ‘Fundamental Endgame Knowledge’ and much more
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"The key defender" – free sample from ChessBase Magazine #228

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When determining whether a piece is good or bad in a specific position, a number of factors come into play: if the piece is active, we generally consider it valuable. The question of whether the piece restricts the opponent's play is also relevant to assessing its quality. In addition, the vulnerability of the piece also plays an important role. And last but not least, the piece's contribution to its own defence is also taken into account in the assessment. 

Jan Markos' new article deals with this last aspect, or more precisely, with pieces that perform well due to their special defensive capabilities. Jan Markos approaches the topic from the perspective of the attacker. The attacker's task is to identify the most important piece within the opponent's defence and remove it from the board. 

The first example from his video contribution comes from the game between Karsten Mueller and Zurab Azmaiparashvili (2003), and it is a very complex position in which only one pair of pawns has been exchanged so far: 

Black is to move. Which is the most important defensive piece in the white position here? It is the bishop on g2, because it performs two defensive tasks at once: it covers the exposed knight on d5 in the centre and at the same time protects its king. Black found a way to exchange the defender with 21...Nh4! 22.Bh1 Nhf3+ 23.Bxf3 Nxf3 24.Rxf3 Qxd5. The resulting weakening of the white squares in the white camp quickly proved to be decisive for the game. 

However, the second example in Markos' video shows that it is not always easy to identify the most important defensive piece in the opponent's camp. 

As in previous contributions to his series, our author has provided a small collection of exercises to accompany the video. Enjoy!

Highlights of ChessBase Magazine #228

From the FIDE Grand Swiss 2025 to Rustam Kasimdzhanov's opening video on the Petroff and Oliver Reeh's tactical contribution ‘Capturing is fun!’ to ‘The Fortress’ by Dorian Rogozenco.

Over 7 hours of video playing time with Felix Blohberger, Rustam Kasimdzhanov, Jan Markos, Mihail Marin, Dr Karsten Müller, Michael Prusikin, Oliver Reeh, Robert Ris, Dorian Rogozenco and Ivan Sokolov – FIDE Grand Swiss 2025: analyses by Giri, Bluebaum, Vaishali, Abdusattorov, Mishra, Vidit and many more – The double block: Mihail Marin highlights scenarios in which it is advantageous to block passed pawns with a knight and bishop – Action in the Nimzo-Indian: Balázs Csonka examines 1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Qc2 0-0 5.e4 d6 6.e5!? – "The key defender": In his ‘Practical Tips for Tournament Players’, Jan Markos shows how to identify and eliminate your opponent's most important piece – All in One: Romain Edouard himself was amazed at how well 1.e4 e6 2.d4 d5 3.Nd2 e5!? works, and much more.

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