“What the hell is going on?”
Mustafa Yilmaz, aged 30, crossed the 2600 rating barrier for the first time in May 2016. Since then, for almost seven years, his rating has oscillated between 2595 and 2637. Suddenly, after five rounds at Tata Steel Challengers, Yilmaz finds himself in a great position to achieve a major milestone in his career, as he is the sole leader in the standings with 4/5 points. On Wednesday, he beat top seed Amin Tabatabaei with the black pieces.
In this video course, experts (Pelletier, Marin, Müller and Reeh) examine the games of Viktor Korchnoi. Let them show you which openings Korchnoi chose to play, where his strength in middlegames were, or how he outplayed his opponents in the endgame.
Replying to an official tweet announcing his standing atop the tournament table, the 3-time Turkish champion wrote: “What the hell is going on?” next to a smiley emoji. He later added:
Or, in English, “My favourite day at chess tournaments: the free day”. Indeed, after five rounds of hard-fought chess, the Challengers will get a rest on Thursday, when only the Masters’ participants will be playing at the main stage of the tournament hall.
Three players stand a half point behind Yilmaz. Joining former co-leaders Alexander Donchenko and Velimir Ivic, who drew their round-5 games, is Olympic gold medallist Javokhir Sindarov from Uzbekistan, who defeated Jergus Pechac with white to claim his second win of the event.

Javokhir Sindarov | Photo: Jurriaan Hoefsmit / Tata Steel Chess Tournament 2023
In Tabatabaei v Yilmaz, a combative opening led to a tense position with a pair of knights facing a pair of bishops in an asymmetrical structure. Black was putting considerable pressure on his opponent’s weakened pawn on the d-file when Tabatabaei incorrectly decided to break the tension in the centre.
Maintining the status quo with 37.Qc2 or 37.Ne2 was the way to go, but White rushed with 37.d5, counting on tactical shots to justify his giving up an exchange in the continuation that followed — 37...cxd5 38.Rxd5 Bxd5 39.Rxd5 Rxd5 40.Nexd5 Qxf6 41.Nxf6
White is material down, but the potential discovered check and the black king’s general vulnerability look somewhat dangerous. However, Yilmaz had foreseen that after the low-key 41...Kf7 there was nothing to worry about.
In this video course, twenty-nine examples with multiple questions are presented in the interactive format, which is ideal for a range of playing strengths. Step by step you will be taken through the complex positions.
Tabatabaei continued trying to create problems for his opponent until move 49 when he finally conceded defeat.

Amin Tabatabaei apparently thought it was also a rest day for the Challengers, as he arrived in the playing hall almost 15 minutes late | Photo: Tata Steel Chess Tournament 2023
Yilmaz and Sindarov were not the only winners of the day, though. Thomas Beerdsen grabbed his first full point of the tournament by beating Eline Roebers with the white pieces. Out of a topical line of the French Defence, which leaves the kings castled on opposite flanks, Roebers achieved a considerable advantage — until one single misstep turned the tables completely.
Roebers had shown great calculation ability to reach this position with black. Given the complexity of the position, though, both players had spent ample amounts of time.
Pressed by the clock, Roebers faltered with 28...e2 when the sensible 28...Ke7 was the one move that kept her advantage intact. Luckily for Beerdsen, there was not much to consider as to how to continue in such a double-edged position.
29.Qg8+ Ke7 30.Qxb8 exd1Q+ 31.Rxd1, threatening both mate-in-two (Qd8+ and Qd7#) and Bb4+, grabbing the queen.
Black is doomed. Roebers tried 31...Qd6, but resigned after 32.Bb4 c5 33.Bxc5. It was a painful, albeit instructive, loss for the former World Youth Champion in the U-14 girls’ category.

Popular among her young compatriots — Eline Roebers | Photo: Jurriaan Hoefsmit / Tata Steel Chess Tournament 2023
Standings after round 5 - Challengers
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1.d4 d5 2.c4 e6 3.cxd5 exd5 4.Nc3 c6 5.Bf4 Bd6 6.Bxd6 Qxd6 7.e3 Nf6 8.Bd3 0-0 9.h3 Re8 10.Qc2 10...b6N 10...Nbd7 11.Nf3 Nf8 12.0-0 Ng6 13.Rab1 Bd7 14.b4 a5 15.bxa5 Rxa5 16.Rxb7 Rea8 17.Rfb1 Bc8 18.R7b4 Nf8 19.a4 N8d7 20.R4b2 g6 21.Nd2 Ba6 11.Rc1 c5 12.dxc5 bxc5 13.Nb5 Qd8 13...Qa6= 14.Qxc5 Nbd7 14.Qxc5± Na6 15.Qa3 d4 16.Nf3 16.Nd6?! Re6 17.Nxf7 17.Bxa6 Bxa6 18.Rc6 Bb5-+ 17...Kxf7= 16...dxe3 17.0-0! exf2+ 17...e2? 18.Rfe1+- 17...Nb4 18.Qxb4 18.Bxh7+ Nxh7 19.Qxb4 Rb8= 18...Qxd3 18.Rxf2 Qb6 19.Nd6 Rd8 20.Nxf7 Rxd3 20...Kxf7? 21.Ng5+ 21.Re1 Bb7 21...Ke8 22.Re1+ 22.Bxh7 Rd5+- 22...Kd7 23.Qe7+ 23.Bxh7 Kc7= 23...Kc6 24.Bxa6 24.Qxg7 Rxd3 25.Qxf6+ Kb7= 24...Bxa6 25.Re6+ 25.Qxg7 Rd6+- 25...Kb5 26.Rxb6+ axb6 27.Qxg7 Rd1+ 28.Kh2+- 21.Qxd3 Nb4 22.Qd8+ 22.Qc4?! Be6= 22.Qd6!± Qxf2+ 23.Kxf2 Ne4+ 24.Ke3 Nxd6 25.Nxd6 22...Qxd8! 23.Nxd8 Nd3 24.Rc7 Nxf2 25.Kxf2 Nd5! 26.Rc5 Nb4 27.Ne5 Bxh3! 28.Ndc6 Nxc6 29.Rxc6= Re8 30.Rc5 Be6 31.a3 Bb3 32.Nc6 a6 33.Nd4 Rb8 34.Ke3 h5 35.g3 Bf7 36.b4 Re8+ 37.Kf4 Bg6 38.Re5 Rxe5 39.Kxe5 Be8 40.Kf5 Kf7 41.Kg5 g6 42.Nb3 Ke7 43.Nc5 a5 44.bxa5 Kd6 45.Ne4+ Kc6 46.Kf6 46.Nf6!? Bf7 47.Ne4= 46...Kc7 47.Nc5 Kc6 48.Na6 Kb7 49.Nc5+ Kc6 50.Ne4 Kc7 51.Nc3 Kb7 52.Nd5 Bc6 53.Ne7 Bf3 54.Nxg6 Ka6 55.Ne5 Be2 56.Nc6 Bf3 57.Nd4 Bd1 58.Ne6 Kxa5 59.Nc5 Bc2 60.Ke5 Kb5 61.Kd4 Bf5 62.Kd5 Bg4 63.Kd6 Bf3 64.Nd3 Ka4 65.Nf4 Kxa3 66.Nxh5 Bxh5 67.g4 Bxg4 ½–½ - Start an analysis engine:
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Tabatabaei,M | 2686 | Adhiban,B | 2610 | ½–½ | 2023 | D31 | 85th Tata Steel Challengers 2023 | 1.1 |
Donchenko,A | 2627 | Sindarov,J | 2654 | ½–½ | 2023 | A31 | 85th Tata Steel Challengers 2023 | 1.2 |
L'Ami,E | 2627 | Supi,L | 2608 | ½–½ | 2023 | E06 | 85th Tata Steel Challengers 2023 | 1.3 |
Yilmaz,M | 2609 | Ivic,V | 2585 | ½–½ | 2023 | D33 | 85th Tata Steel Challengers 2023 | 1.4 |
Warmerdam,M | 2616 | Pechac,J | 2637 | 1–0 | 2023 | C60 | 85th Tata Steel Challengers 2023 | 1.5 |
Mishra,A | 2559 | Roebers,E | 2361 | 1–0 | 2023 | E14 | 85th Tata Steel Challengers 2023 | 1.6 |
Beerdsen,T | 2515 | Vaishali,R | 2425 | ½–½ | 2023 | B30 | 85th Tata Steel Challengers 2023 | 1.7 |
Supi,L | 2608 | Warmerdam,M | 2616 | ½–½ | 2023 | C50 | 85th Tata Steel Challengers 2023 | 2.1 |
Yilmaz,M | 2609 | Mishra,A | 2559 | ½–½ | 2023 | D44 | 85th Tata Steel Challengers 2023 | 2.2 |
Ivic,V | 2585 | Sindarov,J | 2654 | ½–½ | 2023 | D87 | 85th Tata Steel Challengers 2023 | 2.3 |
Vaishali,R | 2425 | Donchenko,A | 2627 | 0–1 | 2023 | B85 | 85th Tata Steel Challengers 2023 | 2.4 |
Adhiban,B | 2610 | Beerdsen,T | 2515 | ½–½ | 2023 | D43 | 85th Tata Steel Challengers 2023 | 2.5 |
Roebers,E | 2361 | L'Ami,E | 2627 | 1–0 | 2023 | C95 | 85th Tata Steel Challengers 2023 | 2.6 |
Pechac,J | 2637 | Tabatabaei,M | 2686 | 0–1 | 2023 | C34 | 85th Tata Steel Challengers 2023 | 2.7 |
Mishra,A | 2559 | Ivic,V | 2585 | 0–1 | 2023 | D11 | 85th Tata Steel Challengers 2023 | 3.1 |
Donchenko,A | 2627 | Adhiban,B | 2610 | ½–½ | 2023 | B38 | 85th Tata Steel Challengers 2023 | 3.2 |
Tabatabaei,M | 2686 | Supi,L | 2608 | ½–½ | 2023 | B90 | 85th Tata Steel Challengers 2023 | 3.3 |
Warmerdam,M | 2616 | Roebers,E | 2361 | ½–½ | 2023 | E11 | 85th Tata Steel Challengers 2023 | 3.4 |
L'Ami,E | 2627 | Yilmaz,M | 2609 | 0–1 | 2023 | B93 | 85th Tata Steel Challengers 2023 | 3.5 |
Beerdsen,T | 2515 | Pechac,J | 2637 | ½–½ | 2023 | C52 | 85th Tata Steel Challengers 2023 | 3.6 |
Sindarov,J | 2654 | Vaishali,R | 2425 | 1–0 | 2023 | B30 | 85th Tata Steel Challengers 2023 | 3.7 |
Roebers,E | 2361 | Tabatabaei,M | 2686 | ½–½ | 2023 | B60 | 85th Tata Steel Challengers 2023 | 4.1 |
Ivic,V | 2585 | Vaishali,R | 2425 | 1–0 | 2023 | B45 | 85th Tata Steel Challengers 2023 | 4.2 |
Adhiban,B | 2610 | Sindarov,J | 2654 | ½–½ | 2023 | E81 | 85th Tata Steel Challengers 2023 | 4.3 |
Yilmaz,M | 2609 | Warmerdam,M | 2616 | 1–0 | 2023 | D45 | 85th Tata Steel Challengers 2023 | 4.4 |
Pechac,J | 2637 | Donchenko,A | 2627 | 0–1 | 2023 | B22 | 85th Tata Steel Challengers 2023 | 4.5 |
Supi,L | 2608 | Beerdsen,T | 2515 | ½–½ | 2023 | B22 | 85th Tata Steel Challengers 2023 | 4.6 |
Mishra,A | 2559 | L'Ami,E | 2627 | 0–1 | 2023 | E04 | 85th Tata Steel Challengers 2023 | 4.7 |
Tabatabaei,M | 2686 | Yilmaz,M | 2609 | 0–1 | 2023 | D35 | 85th Tata Steel Challengers 2023 | 5.1 |
Donchenko,A | 2627 | Supi,L | 2608 | ½–½ | 2023 | D59 | 85th Tata Steel Challengers 2023 | 5.2 |
L'Ami,E | 2627 | Ivic,V | 2585 | ½–½ | 2023 | D12 | 85th Tata Steel Challengers 2023 | 5.3 |
Sindarov,J | 2654 | Pechac,J | 2637 | 1–0 | 2023 | B01 | 85th Tata Steel Challengers 2023 | 5.4 |
Warmerdam,M | 2616 | Mishra,A | 2559 | ½–½ | 2023 | D30 | 85th Tata Steel Challengers 2023 | 5.5 |
Beerdsen,T | 2515 | Roebers,E | 2361 | 1–0 | 2023 | C15 | 85th Tata Steel Challengers 2023 | 5.6 |
Vaishali,R | 2425 | Adhiban,B | 2610 | ½–½ | 2023 | B36 | 85th Tata Steel Challengers 2023 | 5.7 |
Ivic,V | 2585 | Adhiban,B | 2610 | ½–½ | 2023 | E94 | 85th Tata Steel Challengers 2023 | 6.1 |
Pechac,J | 2637 | Vaishali,R | 2425 | 0–1 | 2023 | D85 | 85th Tata Steel Challengers 2023 | 6.2 |
Supi,L | 2608 | Sindarov,J | 2654 | ½–½ | 2023 | C50 | 85th Tata Steel Challengers 2023 | 6.3 |
Roebers,E | 2361 | Donchenko,A | 2627 | 0–1 | 2023 | B12 | 85th Tata Steel Challengers 2023 | 6.4 |
Yilmaz,M | 2609 | Beerdsen,T | 2515 | ½–½ | 2023 | D45 | 85th Tata Steel Challengers 2023 | 6.5 |
Mishra,A | 2559 | Tabatabaei,M | 2686 | ½–½ | 2023 | D12 | 85th Tata Steel Challengers 2023 | 6.6 |
L'Ami,E | 2627 | Warmerdam,M | 2616 | 1–0 | 2023 | D12 | 85th Tata Steel Challengers 2023 | 6.7 |
Donchenko,A | 2627 | Yilmaz,M | 2609 | 1–0 | 2023 | D38 | 85th Tata Steel Challengers 2023 | 7.1 |
Warmerdam,M | 2616 | Ivic,V | 2585 | ½–½ | 2023 | B15 | 85th Tata Steel Challengers 2023 | 7.2 |
Sindarov,J | 2654 | Roebers,E | 2361 | 1–0 | 2023 | C07 | 85th Tata Steel Challengers 2023 | 7.3 |
Beerdsen,T | 2515 | Mishra,A | 2559 | 1–0 | 2023 | B99 | 85th Tata Steel Challengers 2023 | 7.4 |
Tabatabaei,M | 2686 | L'Ami,E | 2627 | 1–0 | 2023 | E04 | 85th Tata Steel Challengers 2023 | 7.5 |
Vaishali,R | 2425 | Supi,L | 2608 | 1–0 | 2023 | B94 | 85th Tata Steel Challengers 2023 | 7.6 |
Adhiban,B | 2610 | Pechac,J | 2637 | 0–1 | 2023 | C65 | 85th Tata Steel Challengers 2023 | 7.7 |
Mishra,A | 2559 | Donchenko,A | 2627 | ½–½ | 2023 | D12 | 85th Tata Steel Challengers 2023 | 8.1 |
Yilmaz,M | 2609 | Sindarov,J | 2654 | 1–0 | 2023 | A16 | 85th Tata Steel Challengers 2023 | 8.2 |
Ivic,V | 2585 | Pechac,J | 2637 | 1–0 | 2023 | C67 | 85th Tata Steel Challengers 2023 | 8.3 |
L'Ami,E | 2627 | Beerdsen,T | 2515 | ½–½ | 2023 | D31 | 85th Tata Steel Challengers 2023 | 8.4 |
Warmerdam,M | 2616 | Tabatabaei,M | 2686 | ½–½ | 2023 | D79 | 85th Tata Steel Challengers 2023 | 8.5 |
Roebers,E | 2361 | Vaishali,R | 2425 | ½–½ | 2023 | B33 | 85th Tata Steel Challengers 2023 | 8.6 |
Supi,L | 2608 | Adhiban,B | 2610 | 0–1 | 2023 | C02 | 85th Tata Steel Challengers 2023 | 8.7 |
Donchenko,A | 2627 | L'Ami,E | 2627 | 0–1 | 2023 | D35 | 85th Tata Steel Challengers 2023 | 9.1 |
Vaishali,R | 2425 | Yilmaz,M | 2609 | 0–1 | 2023 | B94 | 85th Tata Steel Challengers 2023 | 9.2 |
Tabatabaei,M | 2686 | Ivic,V | 2585 | ½–½ | 2023 | D33 | 85th Tata Steel Challengers 2023 | 9.3 |
Beerdsen,T | 2515 | Warmerdam,M | 2616 | 0–1 | 2023 | B96 | 85th Tata Steel Challengers 2023 | 9.4 |
Sindarov,J | 2654 | Mishra,A | 2559 | 1–0 | 2023 | B90 | 85th Tata Steel Challengers 2023 | 9.5 |
Adhiban,B | 2610 | Roebers,E | 2361 | 1–0 | 2023 | A17 | 85th Tata Steel Challengers 2023 | 9.6 |
Pechac,J | 2637 | Supi,L | 2608 | ½–½ | 2023 | D35 | 85th Tata Steel Challengers 2023 | 9.7 |
Yilmaz,M | 2609 | Adhiban,B | 2610 | ½–½ | 2023 | A33 | 85th Tata Steel Challengers 2023 | 10.1 |
Warmerdam,M | 2616 | Donchenko,A | 2627 | 0–1 | 2023 | B53 | 85th Tata Steel Challengers 2023 | 10.2 |
L'Ami,E | 2627 | Sindarov,J | 2654 | ½–½ | 2023 | E48 | 85th Tata Steel Challengers 2023 | 10.3 |
Ivic,V | 2585 | Supi,L | 2608 | 0–1 | 2023 | B90 | 85th Tata Steel Challengers 2023 | 10.4 |
Tabatabaei,M | 2686 | Beerdsen,T | 2515 | 1–0 | 2023 | D12 | 85th Tata Steel Challengers 2023 | 10.5 |
Mishra,A | 2559 | Vaishali,R | 2425 | ½–½ | 2023 | B40 | 85th Tata Steel Challengers 2023 | 10.6 |
Roebers,E | 2361 | Pechac,J | 2637 | ½–½ | 2023 | C60 | 85th Tata Steel Challengers 2023 | 10.7 |
Donchenko,A | 2627 | Tabatabaei,M | 2686 | 1–0 | 2023 | A17 | 85th Tata Steel Challengers 2023 | 11.1 |
Pechac,J | 2637 | Yilmaz,M | 2609 | ½–½ | 2023 | B22 | 85th Tata Steel Challengers 2023 | 11.2 |
Sindarov,J | 2654 | Warmerdam,M | 2616 | ½–½ | 2023 | B55 | 85th Tata Steel Challengers 2023 | 11.3 |
Beerdsen,T | 2515 | Ivic,V | 2585 | 1–0 | 2023 | B31 | 85th Tata Steel Challengers 2023 | 11.4 |
Adhiban,B | 2610 | Mishra,A | 2559 | ½–½ | 2023 | B99 | 85th Tata Steel Challengers 2023 | 11.5 |
Vaishali,R | 2425 | L'Ami,E | 2627 | ½–½ | 2023 | C79 | 85th Tata Steel Challengers 2023 | 11.6 |
Supi,L | 2608 | Roebers,E | 2361 | 1–0 | 2023 | A20 | 85th Tata Steel Challengers 2023 | 11.7 |
Beerdsen,T | 2515 | Donchenko,A | 2627 | 0–1 | 2023 | B12 | 85th Tata Steel Challengers 2023 | 12.1 |
Yilmaz,M | 2609 | Supi,L | 2608 | ½–½ | 2023 | D35 | 85th Tata Steel Challengers 2023 | 12.2 |
Tabatabaei,M | 2686 | Sindarov,J | 2654 | ½–½ | 2023 | E36 | 85th Tata Steel Challengers 2023 | 12.3 |
Ivic,V | 2585 | Roebers,E | 2361 | 1–0 | 2023 | E11 | 85th Tata Steel Challengers 2023 | 12.4 |
L'Ami,E | 2627 | Adhiban,B | 2610 | 0–1 | 2023 | C13 | 85th Tata Steel Challengers 2023 | 12.5 |
Warmerdam,M | 2616 | Vaishali,R | 2425 | 1–0 | 2023 | A34 | 85th Tata Steel Challengers 2023 | 12.6 |
Mishra,A | 2559 | Pechac,J | 2637 | 1–0 | 2023 | C54 | 85th Tata Steel Challengers 2023 | 12.7 |
Donchenko,A | 2627 | Ivic,V | 2585 | 1–0 | 2023 | D14 | 85th Tata Steel Challengers 2023 | 13.1 |
Roebers,E | 2361 | Yilmaz,M | 2609 | 0–1 | 2023 | B90 | 85th Tata Steel Challengers 2023 | 13.2 |
Sindarov,J | 2654 | Beerdsen,T | 2515 | 1–0 | 2023 | B11 | 85th Tata Steel Challengers 2023 | 13.3 |
Vaishali,R | 2425 | Tabatabaei,M | 2686 | 0–1 | 2023 | B94 | 85th Tata Steel Challengers 2023 | 13.4 |
Adhiban,B | 2610 | Warmerdam,M | 2616 | 0–1 | 2023 | B13 | 85th Tata Steel Challengers 2023 | 13.5 |
Pechac,J | 2637 | L'Ami,E | 2627 | 0–1 | 2023 | C93 | 85th Tata Steel Challengers 2023 | 13.6 |
Supi,L | 2608 | Mishra,A | 2559 | 1–0 | 2023 | D45 | 85th Tata Steel Challengers 2023 | 13.7 |
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