Prague: Keymer leads Challengers, Abdusattorov close behind

by Carlos Alberto Colodro
6/14/2022 – All five games finished drawn in round 5 of the Masters section at the Prague Chess Festival, which left Le Quang Liem and Pentala Harikrishna sharing the lead on 3½ points. Meanwhile, in the Challengers, Vincent Keymer kept the sole lead after beating Peter Michalik with the black pieces. Nodirbek Abdusattorov (pictured) also won and is now in sole second place, a half point back. | Photo: Vladimír Jagr

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Three rising stars

A very interesting lineup has been put together in the Challengers section of this year’s Prague Chess Festival. Three players from the top-10 in the juniors’ ranking were invited: Hans Niemann, Vincent Keymer and Nodirbek Abdusattorov. The promising talents are all likely to become stable 2700+ rated players, and they are topping the standings in the Czech capital.

After five rounds, Keymer has collected three wins and two draws to take the sole lead on a remarkable 4/5 score. Abdusattorov, who is also undefeated, stands a half point back, while Niemann is one of three players on a +1 score — the US grandmaster has won twice after his loss in round 2.

Niemann has already drawn his direct encounters against his top-10 colleagues. Keymer and Abdusattorov, on the other hand, are yet to face each other in round 7, when the Uzbek star will get the white pieces.

All three of them won their round-5 games on Monday. Niemann caught Krishnan Sasikiran’s in a mating net in a double-edged queenless position.

 
Niemann vs. Sasikiran - Round 5

33.Bxc7+ Kc8 34.Be6, threatening a deadly discovered check, 35...Rg2+ 35.Kf1 Re2 and White got to play a nice double check to end the game.

 

Both the rook and the light-squared bishop are under attack, but Black cannot grab either of the two pieces. Sasikiran resigned instead of playing the only move 36...Kxc7, which would be followed by 37.Rc8#

Hans Niemann, Kirshnan Sasikiran

Focused — Hans Niemann and Krishnan Sasikiran | Photo: Vladimír Jagr

In round 4, Dutch grandmaster Max Warmerdam got the better of Peter Michalik with the black pieces. A very interesting endgame appeared on the board, in which Warmerdam had a queen and a pawn against Michalik’s rook and two far-advanced connected passers. As shown by GM Karsten Müller, Black could have held the draw from the following position:

 
Warmerdam vs. Michalik - Round 4

Michalik’s 74...Kd2 allowed White to create zugzwangs later on, which combined with a2-a3 later were enough to untangle his position and get rid of the dangerous passers. Instead, 74...Re2 would have drawn the game for Black!

Check out GM Müller’s full analysis in the replayer below.

 
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1.d4 Nf6 2.c4 e6 3.Nf3 d5 4.Nc3 Be7 5.cxd5 exd5 6.Bf4 c6 7.e3 Bf5 8.Nh4 Bg4 9.Qc2 Nh5 10.h3 Be6 11.Nf3 Nxf4 12.exf4 g6 13.Bd3 Qd6 14.Ne2 Nd7 15.0-0 Nf6 16.Ne5 Nd7 17.Nf3 Nf6 18.f5 gxf5 19.Bxf5 Bxf5 20.Qxf5 Nd7 21.Ng3 0-0-0 22.Ne5 Rdf8 23.Nxf7 Qf6 24.Qxf6 Bxf6 25.Nxh8 Bxd4 26.Rae1 Bxb2 27.Re7 Rxh8 28.Nf5 Ba3 29.Rg7 Bf8 30.Rf7 Ne5 31.Rf6 Bc5 32.Kh2 d4 33.Rc1 Nd3 34.Rxc5 Nxc5 35.Nxd4 Nd7 36.Rf7 h5 37.f4 a6 38.g3 c5 39.Nf5 Kc7 40.Kg2 c4 41.Ne3 b5 42.g4 hxg4 43.hxg4 Kd6 44.g5 c3 45.g6 Rg8 46.f5 Ne5 47.Rf6+ Kc5 48.Re6 Nc6 49.Nc2 a5 50.Kf3 Nd4+ 51.Nxd4 Kxd4 52.Ke2 b4 53.f6 Rxg6 54.Rd6+ Ke4 55.f7 Rxd6 56.f8Q Rd2+ 57.Ke1 Rb2 58.Qe7+ Kd3 59.Qd6+ Ke3 60.Qe5+ Kd3 61.Qf5+ Ke3 62.Kd1 a4 63.Qe6+ Kd3 64.Qd7+ Kc4 65.Qc6+ Kd3 66.Qb5+ Kd4 67.Qxa4 Kc4 68.Qc6+ Kd4 69.Qb5 Rd2+ 70.Kc1 Rb2 71.Qb6+ Kd3 72.Qc5 Rc2+ 73.Kb1 Rb2+ 74.Ka1 Counterplay counts. Sometimes a rook and a pawn can draw against a queen. But the defender must often decide to be active or to stay passive: Kd2? Black has no fortress as White can use zugzwang and later the lever a2-a3 to break through. After 74...Re2‼ Black's threat to invade on the first rank forces White to force a draw, e.g. 75.Qb5+ 75.Qg1 Kd2= 75.a3 can now be met by Re1+ 75...b3 draws as well. 76.Ka2 b3+ 77.Kxb3 Rb1+ 78.Ka2 c2= 75...Kd2 76.Qd5+ 76.Qxb4?? Re1+ 77.Qb1 Rxb1+ 78.Kxb1 c2+ 79.Kb2 c1Q+-+ 76...Kc2 77.Qh1 Kd2 78.Qh6+ Kc2 79.Qh4 Kd2 80.Qf4+ Kc2 81.Qf1 Kd2= 74...Kc2? runs into 75.Qf5+ Kd2 76.Qe4 for example Kd1 76...Rc2 77.Qd4+ Ke2 78.Kb1 Rb2+ 79.Kc1+- 77.Qe3 Kc2 78.Qe2+ Kc1 79.Qd3 Rf2 80.Qb1+ Kd2 81.a3 c2 82.Qxb4+ Kd1 83.Qd4+ Rd2 84.Qg1+ Ke2 85.Kb2+- 75.Qf2+ Kd3 76.Qf1+ Kd4 76...Re2 77.Kb1 Kd2 78.Qf4+ Kd3 79.Qd6+ Ke3 80.Kc1 Re1+ 81.Kc2 Re2+ 82.Kb3 Rb2+ 83.Kc4+- 77.Qf3 Kc4 78.Qe4+ Kc5 79.Qd3 Rd2 80.Qe3+ Kb5 81.Kb1 Rd1+ 82.Kc2 Rd2+ 83.Kc1 Of course not 83.Kb3?? Rb2# 83...Kc4 83...Rxa2 is met by 84.Qe8+ Kc5 85.Qe5+ Kc4 86.Qe6++- 84.Qb6 Rb2 84...Rxa2?! runs into 85.Qe6++- 85.Qc6+ Kd4 86.Qb5 Ke4 87.Qc5 Kd3 88.Qd5+ Ke3 89.Qc4 Kf2 90.a3 The final lever. bxa3 91.Qxc3 Re2 92.Qc5+ Of course not 92.Qxa3?? Re1+ 93.Kd2 Re2+= 92...Kg2 93.Qxa3 Kf2 94.Qc5+ Kf3 95.Kd1 Rf2 96.Qf5+ Ke3 97.Qe5+ Kf3 98.Ke1 Rg2 99.Qf5+ Ke3 This loses the rook directly. But 99...Kg3 100.Kf1 Rh2 101.Qe5+ Kh3 102.Qd6 is also easily winning for White. 100.Qh3+ 1–0
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WhiteEloWBlackEloBResYearECOEventRnd
Warmerdam,M2614Michalik,P25791–02022D35Prague Festival-Challengers 20224.4

Round 5 results - Challengers

 

Standings after round 5

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Le and Harikrishna still on top

Meanwhile, in the Masters section, Monday’s five draws meant Le Quang Liem and Pentala Harikrishna remained in the shared lead atop the standings table.

We also received an in-depth analysis by GM Müller from the Masters’ fourth round. Hari’s victory with black over Parham Maghsoodloo was certainly the highlight of the day, as it reached the Troitsky Endgame.

 
Maghsoodloo vs. Harikrishna - Round 4

GM Müller writes:

Two knights against pawn has been investigated very deeply by Russian endgame theoretician Troitzky. When the pawn is securely blocked by a knight, he has given a line where the attacker always wins. If the pawn is blocked on a5, b3, c4, d5, e5, f4, g3, h5 or below then the attacker always wins, but the 50-move rule is not taken into account. Here the pawn has crossed that line and so there is a drawing and a losing zone for the defending king. The drawing zone starts from the safe corners and the losing zone from the unsafe corners. Here b7 is safe and h8 is unsafe.

A great chance to learn more about this rare setup!

 
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1.d4 d5 2.c4 c6 3.Nf3 Nf6 4.e3 Bf5 5.Nc3 e6 6.Nh4 Be4 7.f3 Bg6 8.Qb3 Qb6 9.Nxg6 hxg6 10.Bd2 Nbd7 11.0-0-0 Qxb3 12.axb3 Bb4 13.Kc2 0-0-0 14.Bd3 a6 15.Be1 Bd6 16.h4 Ne8 17.e4 Nc7 18.Bf2 Be7 19.g4 a5 20.Bg3 Nb8 21.Be2 Bd6 22.e5 Bb4 23.c5 b6 24.cxb6 Na8 25.Na2 Be7 26.Be1 Kb7 27.Bxa5 c5 28.dxc5 Bxc5 29.b4 Bxb6 30.f4 Rc8+ 31.Nc3 Nc6 32.Bxb6 Nxb6 33.Kb3 Ra8 34.b5 Na5+ 35.Kb4 Nac4 36.b3 Ne3 37.Rc1 Rhc8 38.Bf3 Ra1 39.h5 gxh5 40.gxh5 Kb8 41.f5 exf5 42.h6 gxh6 43.Rxa1 Nc2+ 44.Ka5 Kb7 45.Bxd5+ Nxd5 46.Rxh6 Rxc3 47.Ra4 Nce3 48.e6 fxe6 49.Rxe6 f4 50.Rxf4 Nxf4 51.Rb6+ Kc7 52.Rc6+ Rxc6 53.bxc6 Ned5 54.b4 Nb6 55.Kb5 Ne6 56.Ka6 Kxc6 57.b5+ Kc5 58.Kb7 Nd8+ 59.Kc7 Nf7 60.Kb7 Ne5 61.Kc7 Ned7 The Troitzky endgame. Two knights against pawn has been investigated very deeply by Russian endgame theoretician Troitzky. When the pawn is securely blocked by a knight, he has given a line where the attacker always wins. If the pawn is blocked on a5, b3, c4, d5, e5, f4, g3, h5 or below then the attacker always wins, but the 50 move rule is not taken into account. Here the pawn has crossed that line and so there is a drawing and a losing zone for the defending king. The drawing zone starts from the safe corners and the losing zone from the unsafe corners. Here b7 is safe and h8 is unsafe: 62.Kd8 The king can also stay on the queenside, e.g. 62.Kb7 Kd6 63.Ka7 Kc7 64.Ka6 Kb8 65.Ka5 Kb7 66.Kb4= 62...Kd6 63.Ke8 Ne5 64.Kf8 Ke6 65.Kg7 Kf5 "At last a critical moment: the White king has five squares available but four of them lose" (Tim Harding) 66.Kh6? Amazingly after 66.Kh7‼ Kg5 67.Kg7= Black cannot make progress. The postion is mutual zugzwang. The losing zone around the unsafe corner h8 is very small, but matters are also very delicate. 66...Kg4 67.Kh7 Kh5 68.Kg7 Kg5 69.Kh7 Nf7? 69...Ng4 is the way to go, e.g. 70.Kg7 Nh6 71.Kf8 Kf6 72.Ke8 Nf7 73.Kf8 Nd6 74.Kg8 Nf5 75.Kf8 Ng7 76.Kg8 Ne6 77.Kh7 Kg5 78.Kg8 Kg6 79.Kh8 Nd7 80.b6 Nf6 81.b7 Ng5 82.b8Q Nf7# 70.Kg7? Now White is on the wrong foot. 70.Kg8 Nd6 71.Kg7 and it is Black to move in the mutual zugzwang. 70...Nd6 White to move in the mutual zugzwang position 71.Kh7 Nf5 72.Kg8 Kf6! 73.Kh7 After 73.Kf8 Ng7 a typical imprisonment is reached and mate is near: 74.Kg8 Ne6 75.Kh7 Kg5 76.Kg8 Kg6 77.Kh8 Nd7 78.b6 Nf6 79.b7 Ng5 80.b8Q Nf7# 73...Kf7 74.Kh8 Nd7 74...Nd7 75.b6 Nf8 76.b7 Ne7 77.b8Q Neg6# Many thanks to Tim Harding for his analysis! 0–1
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WhiteEloWBlackEloBResYearECOEventRnd
Maghsoodloo,P2699Harikrishna,P27050–12022D12Prague Festival-Masters 20224.3

David Navara

David Navara | Photo: Vladimír Jagr

Round 5 results - Masters

 

Standings after round 5

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Carlos Colodro is a Hispanic Philologist from Bolivia. He works as a freelance translator and writer since 2012. A lot of his work is done in chess-related texts, as the game is one of his biggest interests, along with literature and music.

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