54...Ra7?
Black should have prevented White from playing c4, because in that case, he would activate all his pieces.
54...Qc7!
A) 55. c4 Ra7 56.Qb5 Rb7
A1) 57.Qa6 Ra7 = with move repetition.
A2) 57.Qa4? Qe5 58.Rd2 d4 -+
B) 55.Rd4 Qb6 =
C) 55.Rd2 Qb6 56.Qe2 Kg8 =
55.Qb6 Qc7 56.Qd4 Ra6 57.c4! Rd6 58.g5 Qd8 59.Qe5 d4 60.c5 Rd7 61.c6 Rd6 62.Nc4 Rxc6 63.Rxd4 Qe7 64.Qh8 Rxc4 65.Rxc4 1-0

🔸World Chess Olympiad Batumi 2018
🔸Round 5
⚪️Howell,David W L (2689)
⚫️Brunello,Sabino (2552)
🔸1-0

37...Bd7??
A blunder. Black leaves his own pieces on the same file that will allow his opponent to exploit that by tactical means.
37...Kf8! 38.Rh2 c4 39.Rh8+ Ke7 40.Rg8 Kf7 41.Ra8 Bd7+/-
White is still better but if Black plays precisely, his task is not easy.
38.g6+! Kf6 39.Rd2 Ke7 40.f6+! gxf6 41.g7 Be6 42.Re2 1-0

⚫️#19 (Strategy-Black to Move)
🔸Nasuta,Grzegorz (2490)
🔸Wojtaszek,Radoslaw (2730)
🔸TCh-POL Ekstraliga 2018 Poland

25...Bh6! [Black brings his bishop to the effective diagonal. Surprisingly, the move will ultimately lead to big trouble for the white knight.]

[25...e3 26.Rxe3 Rxe3 27.fxe3 Qe5 28.Bd3 Qxe3+ 29.Kh1 h4 30.Nf1 Qf4 31.Rd1 Rd8 32.b3 g3 33.Bc4 Re8 34.Qd2 Qg4 35.Qd6 Ne4 36.Qd7 Nf2+ 37.Kg1 gxh2+ 38.Kxh2 Rf8 39.Re1 h3 40.gxh3 Nxh3 41.Re3 Ng5 42.Be2 Be5+ 43.Kh1 Qh4+ 44.Kg2 Bf4 45.Re8 Qh3+ 46.Kg1 Qxc3; 25...Qf4 26.Rce1 Re5 27.Nxe4 Qxf5 28.Qd3 (28.Nxf6+ Bxf6 29.Qxf5 (29.Rxe5?? Qxc2–+) 29...Rxf5=) 28...Rd5 29.Qg3 Rad8 30.Nxf6+ Bxf6=]

26.Rce1 e3 27.Nh1 [27.fxe3 h4 28.Nh1 g3 29.hxg3 hxg3–+]

27...h4 28.Rxe3 [28.fxe3 g3–+]

28...Bxe3 29.fxe3 g3 [The white knight has a hopeless situation.]

30.hxg3 hxg3 31.Qe2 Re4 32.Qf3 Rg4 33.e4 Qb6+ 34.Qe3 Rxe4 [34...Rxe4 35.Qxb6 axb6 36.Rxe4 Nxe4–+] 0–1

⚪️#19 (Endgame-White to Move)
🔸Shankland Samuel (2722)
🔸Van Foreest Jorden (2624)
🔸World Chess Olympiad 2018 Batumi

40.Bb3 [40.g4 Nc4 41.Bb3 Nb6 42.Ke3 Kg7 43.h4 f6 44.Kf4 Kf7 45.exf6 Kxf6 46.g5+ Kf7 47.Ke5 Ke7; 40.f4 Nc4 41.g4 Kg7 42.Bb3 Nb6 43.Kf3 f6 44.Ke3 Kf7 45.h4 Ke7 46.Kd3 Kf7=]

40...b6 [40...Nc4 41.Bxc4 dxc4 42.Kd2 b6 43.Kc3 Kf8 44.Kxc4 Ke7 45.d5+–]

41.Kd2 h6 42.Kc3 Nxa4+ 43.Bxa4 Kf8 44.Kd3 Ke7 45.Ke3 Kf8 46.Kf4 Kg7 [46...Kg7 47.Kg4 Kg8 48.h4 Kg7 49.f4 Kf8 50.h5 Kg8 51.Bc2 Kg7 52.Kh3 Kh7 53.Kh4 Kg7 54.g4 Kh7 55.hxg6+ fxg6 56.f5 gxf5 57.gxf5 exf5 58.Bxf5+ Kg7 59.Kh5 a4 60.Be6+–] 1–0

⚪️#20 (Strategy-White to Move)
🔸Martirosyan,Haik M (2597)
🔸Santos Ruiz,Miguel (2524)
🔸World Juniors 2018

Unity Chess Strategy Multiple Choice 20
public poll

C) 26.Bxb6 – 7
👍👍👍👍👍👍👍 78%
Gavin, @YaminiG, @Somebody_Sophia, @RichardPeng, Rachel, Hansika, Zhenrui

B) 26.Ba1 – 2
👍👍 22%
Vincent, Louis

A) 26.b4
▫️ 0%

👥 9 people voted so far.

⚫️#20 (Endgame-Black to Move)
🔸Kavinda Akila (2047)
🔸Nikolaidis Ioannis (2544)
🔸World Chess Olympiad 2018 Batumi

Unity Chess Endgame Multiple Choice 20
public poll

B) 45.Rd4 – 8
👍👍👍👍👍👍👍 73%
Gavin, @YaminiG, @Somebody_Sophia, Louis, @RichardPeng, Rachel, Hansika, Zhenrui

C) 45...Rc7 – 2
👍👍 18%
Hosein, @roshan_sethuraman

A) 45...kf6 – 1
👍 9%
Vincent

👥 11 people voted so far.

A historic moment in chess broadcast: the three Polgar sisters commentating on #BatumiChess2018 !

Armenian women's team continues to impress. They beat Russia yesterday and now they score against the US team, another rating favorite of the Olympiad. #BatumiOlympiad2018

✅ Today is birthday of Everaldo Matsuura!!
Brazilian chess grandmaster

❤️🌹💐☘️🌷🌺🌸❤️ Happy birthday Dear Everaldo! 👏👏👏👏
. . . . . . . . . . . . .
@unitychess

🔸World Chess Olympiad Batumi 2018
🔸Round 6
⚪️Mamedyarov,Shakhriyar (2820)
⚫️Navara,David (2740)
🔸1-0

28...Ng6?
A carelessness. Navara has appeared less than expected so far in this tournament.
28...Kf8!
A) 29.e6 Rcd8 =
B) 29.Rb6 Rb8=
C) 29.f4 g6 =
29.e6!
Mamedyarov fully Exploits the opportunity.
29...Nf4
29... fxe6?? 30. Bxg6 +-
30.exf7+ Kxf7 31.g3 Ke7 32.Rd2 Ne6 33.Rd5 b4 34.f4 b3 35.axb3 axb3 36.Bg6 Rf8 37.f5 Rf6 38.Rxe6+ Rxe6 39.fxe6 b2 40.Rb5 41.Bh7 1-0