The Lindores Abbey Chess Challenge started this Tuesday. Twelve players are takingpart. After a three-day preliminary, the best eight players will advance to the decidingknockout section.The time control is 15 minutes for the game, with a 10-second increment permove.

Only one player is still undefeated in the Lindores Abbey online event Hikaru Nakamura scored a win and three draws on day two to keep his standing as co-leader. The multiple US champion is an online-chess expert and isknown for his skills in rapid,blitz and bullet (one-minute games or faster). His strong performances inthe two first events of the Magnus Carlsen Tour prompted Soviet chess history expert Douglas Griffin to tweet:

Of course, as the responses to this tweet indicate, Nakamura is nevertheless a strong classical player.

The American is currently sharing the lead with Sergey Karjakin, another quick-play specialist. Karjakin, in fact, was world rapid champion in 2012 and world blitz champion in 2016. On day two, the Russian drew his first three encounters before beating Alireza Firouzja to catch up with 'Naka' in the standings table.

Four players were sharing the lead after Tuesday, but only Nakamurastarted day two with a win. Karjakinand Wesley So drew their direct encounter, while Carlsen went from having a better position to getting caught in a mating net against Yu Yangyi:

Mating Patterns

On this DVD, Grandmaster and worldrenowned commentator Maurice Ashley reviews some of the most interesting patterns with examples meant to educate and entertain.

Black needed to defend against the threats posed by the dangerous doubled rooks on the h-file either with 40...Rd7, planning to exchange one of the menacing rooks,or 40...Nd7, covering a number of key squares. Carlsen faltered by going for40...a3 instead, and after 41.Rg8+ Kf7 42.Kf5he played 42...Nd7, which is a blunder at this juncture. Yu quickly continued with 43.g6+ Ke7 44.e5 and the world champion resigned with mate-in-two on the board.

Alexander Grischuk and Jan-Krzysztof Duda also kicked off the day with a win, taking down Ding Liren and Daniil Dubov respectively.

Select an entry from the list to switch between games

Following the trend of the tournament, all four decisive games of round six were won by the player with the white pieces out of 26 decisive results after two days of action, only 5favoured black. Three of the four winners bounced back from losses to even their scores of the day: Carlsen, Dubov and Levon Aronian, who had been defeated by Nakamura. Firouzja also won, getting a full point for the first time in the event by beating Duda.

In Dubov v So, the Russian played a rare line with white, to which So responded by leaving theory as early as move 6. Naturally, Dubov was better prepared to enter unexplored territory, and punished his opponent's error quicklyafter:

Unorthodox Chess Openings

How many times have you been caught off guard by a seemingly inferior and unusual opening system that later turns out to be an especially strong one? Unorthodox openings can be a real asset to anyones opening repertoire and they often do not contain much theory, making them easy to master for your next important tournament.

So got in trouble with 10...Bxc3, allowing 11.Rd8+ Ke7+ Rxh8. The American could have castled short or gone for 10...Bg4 in orderto step away froma sharp struggle against someone much more used to this sort of complications. Dubov never let go of the initiative and got a much-needed 41-move win.

Meanwhile, Carlsen had white against an out-of-form Wei Yi, and the Norwegian made good use of this opportunity. The world champion clearly trusted his ability to outplay his opponent, as he avoided a triple repetition with amove we do not see very often:

The natural 27.Qd4, already played two moves earlier, would have been responded with 27...Qe4 again, when entering the ending a pawn down but with the bishop pair does not seem to be enough to fight for a win. Therefore, Carlsen went for 27.Qa1 and quickly activated his forces, until eventually getting the better of his young opponent.

After losing against Aronian in the previous round, Yu collected his second scalp of the day and a big one at that by defeating world number three Ding with the white pieces. Yu comes from showing what he is capable of at the Nations Cupand, although he is currently on fifty percent, he should not be underestimated as a challenger for the title, especially after his wins over Carlsen and Ding.

While Yu scored a second win, Carlsen was defeated for a second time in the day, and once again with black. In a strange position with four rooks and bishops of opposite colours against Duda, the Norwegian made an inaccuracy:

31...c6 would have prevented what happened in the game, as after 31...Re7 32.Rab1 it is too late for 32...c6 due to 33.Rxa4. Carlsen lost a pawn in a different way 32...Bc4 33.Rxb6 cxb6 34.Rxb6 and found himself in a difficult opposite-coloured bishops position.

Eight moves later, the world champion was again caught in a mating net:

42...Kh5 43.Kg3 and Black resigned, as Rh6# is unstoppable. Tarjei J. Svensen reported that Carlsen told the Norwegian press:

I am really pissed that I played so badly today. My good feeling over playing well on Tuesdayis gone now. I am no longer following my intuition. It's frustrating. Completely unacceptable.

The day finished with wins for Dubov, Karjakin and Ding. The latter defeated Wei, who is almost out of contention in the fight to reach the quarter-finals the 20-year-oldis alone in the cellar of the standings table on 2 out of 8, with the eight-placed participant two points ahead and only three rounds left in the preliminaries.

Dubov collected his second win of the event after Grischuk blundered in a rook and bishop endgame:

Chess Endgames 9 - Rook and Minor Piece

Endings with rook and minor piece against rook and minor piece occur very frequently, even more often than rook endings, yet there's not much literature on them. This endgame DVD fills this gap. The four different material constellations rook and knight vs rook and knight, rooks and opposite coloured (and same coloured ) bishops and rook and bishop vs rook and knight are dealt with. In view of the different material constellations Karsten Mueller explains many guidelines like e.g. "With knights even a small initiative weighs heavily".

White's 54.Rh6 loses immediately to 54...Rxc3+ 55.Kxc3 f2 and the rook cannot prevent the promotion of the f-pawn 54.Rxh7+ would have prevented Black from going for this trick.

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Lindores Abbey: Karjakin and Nakamura in the lead - Chessbase News