In the following games you can click (or tap) on any move or any diagram to get a special replayer, where you can start an engine and explore the moves even further – and get answers to all residual "What if?" and "Why not?" questions you might have.
Note that on your notebook or tablet screen you can adjust the size of the replay window and move it to the most convenient place. On your mobile phone you can adjust the size of the notation and engine windows.
Game twelve
1.d4 Nf6 2.Nf3 d5 3.e3 3...c5 4.Nbd2 cxd4 5.exd4 Qc7 5...Nc6 5...Bf5 6.c3 Bd7?! 6...Nc6 7.Bb5 7.Bd3 Bg4 8.0-0 e6 9.Re1 Bd6 10.Nf1 Bh5 11.Ng3 Bg6 12.Nf5 Bxf5 13.Bxf5 0-0 14.Bd3 7...Bd7 7...a6!? 8.0-0 e6 9.Re1 7.Bd3 7.Ne5 Nc6 8.Ndf3 7...Nc6 8.0-0 8...Bg4 8...e6 9.Re1 Bd6 10.Qe2 0-0 11.Ne5 9.Re1 e6 10.Nf1 Bd6 11.Bg5 0-0! 12.Bxf6?! 12.Bh4 Bh5 13.Bg3 Bxg3 14.Nxg3 Bg6 15.Bxg6 hxg6 16.h4 12...gxf6 13.Ng3 f5! 14.h3! 14...Bxf3 14...f4 15.hxg4 fxg3 16.fxg3 Bxg3 17.Re2 Kh8∞ 15.Qxf3 Ne7 15...Bxg3? 16.fxg3 Kh8 17.g4± 15...Kh8 16.Nxf5 exf5 17.Qxf5 f6 18.Re6 Rad8 19.Rxf6 Rxf6 20.Qxf6+ Qg7 21.Qe6 16.Nh5 Kh8 17.g4 Rg8 18.Kh1 Ng6! 19.Bc2? 19.gxf5? Nh4 20.Qe3 exf5 19.Rg1 Bh2 20.Rge1 Bd6= 19...Nh4 20.Qe3 20...Rg6! 21.Rg1 f4! 22.Qd3 Qe7 23.Rae1 Qg5 24.c4? 24.Bd1 Rag8 25.c4 dxc4 26.Qxc4 a5 24...dxc4 25.Qc3 25.Qxc4? Nf3-+ 25...b5 26.a4 b4! 27.Qxc4 27...Rag8? 27...Nf3! 28.Qc6 Nxe1 29.Qxa8+ Rg8 30.Qe4 Nxc2 31.Qxc2 Qh4-+ 28.Qc6? 28.Bxg6! hxg6 29.Qc6 gxh5 30.Qxd6 Nf3 31.Qc5! hxg4 32.Qxg5 Rxg5 33.hxg4 Kg7 34.Re4 Nxg1 35.Kxg1 Rxg4+ 36.Kf1 Kf6 37.Ke2= 28...Bb8? 28...Nf5! 29.Rd1 Qh4 30.Qf3 Ng3+!-+ 29.Qb7? 29.Bxg6! hxg6 29...Nxg6 30.Qb7 Ne7 31.Qxb4 Qd5+ 32.Rg2+- 30.d5! Qxd5+ 31.Qxd5 exd5 32.Nf6+- 29...Rh6? 29...Nf5! 30.Rd1 Ne7! 31.Bxg6 hxg6 32.d5! Qh4 30.Be4 Rf8? 30...f3! 31.Qxf7 Ng2 32.Qxf3! Nxe1 33.Rxe1 Qh4 34.Re2 31.Qxb4 Qd8 32.Qc3? 32.d5! e5 32...exd5 33.Qd4+ f6 34.Qxd5± 33.Rc1 a5 33...f5? 34.Qb7!+- 34.Qb7 Ng6 35.Rc6± 32...Ng6! 33.Bg2 33.Rg2 a5 34.Bxg6 hxg6 35.d5+ e5 36.Nxf4 Kg8 37.Rxe5! Qf6! 37...Bxe5? 38.Qxe5 Re8 39.Qd4± 38.Re4 Qxc3 39.bxc3 Bxf4 40.Rxf4 Rxh3+ 41.Kg1 Rxc3 42.Rd4 Rd8 33...Qh4? 33...Bd6 34.Qc6 Rg8∞ 34.Re2 34...f5? 34...a5 35.f3 Qd8 36.b4± 34...Rg8 35.b4 Qg5 36.Ree1± 35.Rxe6! Rxh5 35...f3 36.Bf1 Rxh5 37.gxh5 Qf4 38.Rg3+- 36.gxh5 Qxh5 37.d5+ Kg8 38.d6 38.d6 f3 39.Bf1 Qh6 40.d7+- 1–0
When Nepo played 34…f5, the move was met with disbelief by grandmasters commenting on the game in live broadcasts and online.
Some mistakes repeat themselves often in amateur games. With themes such as "Miscalculating Forcing Lines", "Being Too Materialistic" and "King Safety" Nick Pert shows you how to avoid making typical mistakes.

Ding Liren was also surprised by the move, as he gave Nepomniachtchi a puzzled look

It was clear that Nepo’s nerves had fallen apart. He could not hide his feelings

Photos for Stev Bonhage for FIDE. Well documented, Stev!
Game 13
Avoiding mistakes in the opening and even learning from mistakes is a valuable tool to improve your chess. Ruslan Ponomariov, former FIDE World Champion, demonstrates basic patterns that will help you navigate through the game more easily.

1.e4 e5 2.Nf3 Nc6 3.Bb5 a6 4.Ba4 Nf6 5.0-0 Be7 6.d3 b5 7.Bb3 d6 8.c3 0-0 9.h3 Bb7 10.Be3 10.a4 10...Na5 11.Bc2 c5 12.Nbd2 12...Re8 12...Nc6 13.d4 exd4 14.cxd4 cxd4 14...Qc7? 15.d5 Ne5 16.Nxe5 dxe5± 15.Nxd4 Nxd4 16.Bxd4 Nd7 17.Re1 13.a4 13.d4 exd4 13...Nc6? 14.d5 Nb8 15.c4± 14.cxd4 cxd4 15.Nxd4 Bf8 13...h6 14.d4 14.axb5 axb5 15.d4 exd4 16.cxd4 cxd4 17.Nxd4 Nc4 18.Nxc4 bxc4 19.Ba4 Rf8 20.Rc1∞ 14...exd4 15.cxd4 cxd4 16.Nxd4 Nc4! 17.Nxc4 17.axb5 Nxe3 18.fxe3 axb5 19.Bd3∞ 17...bxc4 18.f3? 18.Qe2 Rc8 19.f3 Bf8 20.Nf5 d5 21.Rad1∞ 18...Bf8! 19.Bf2 19.Bf4 d5 20.e5 Nd7 21.Re1 Bb4 22.Re2 Qh4 23.g3! Qd8! 24.Kh2 a5 19...d5! 20.exd5 Nxd5 21.Be4 21.Re1 Qg5 22.h4 Qf6 21...Re5? 21...Rb8! 22.Bxd5 22.Qc1 Bd6! 22...Qxd5 23.Qc2 Bc8! 24.Rfd1 Bd7 22.Rc1 Rc8 23.Ne2? 23.Qd2 Qf6 23...Bb4 24.Qc2 24.Ne2 Ree8∞ 23...Qe7? 23...Qe8! 24.Re1 24.Qd4 Ne3! 25.Qxe3 25.Bxe3? Bxe4 26.fxe4 Rxe4-+ 25...Bxe4 26.fxe4 26.Bg3? Bc5-+ 26...Rxe4 27.Qf3 Rxe2 24...Rd8 24.Qd4! 24...f5 24...Ne3? 25.Qxe3 Bxe4 26.Bg3 Re6 27.Nf4± 24...Qe8 25.Rxc4 Rxc4 26.Qxc4 Ne3 27.Bxe3 Bxe4 28.fxe4 Rxe4 29.Bd4 Rxe2 30.Bc3= 25.Bg3! Rxe4?! 25...fxe4 26.Bxe5 exf3 27.Rxf3 Qe6! 28.Rxf8+! Rxf8 29.Ng3 Rf7∞ 26.fxe4 Qxe4 27.Qxe4 fxe4 28.Rfd1 28.Rf5! Nb4 29.b3 g6 30.Rxf8+! Rxf8 31.Rxc4 Nd3 32.Rd4 28...Nb4?! 28...Be7! 29.Nc3 Nxc3 30.Rxc3 Bf6 31.Rc2 e3 32.Rd6 Be4 33.Re2 Bg5 34.Re6 Bd3 35.R2xe3 Bxe3+ 36.Rxe3 c3 37.bxc3 Rxc3 38.Kh2 Rb3= 29.Rd7! Bc5+ 30.Kh2 Bc6 31.Rc7! 31...Rxc7 32.Bxc7 Bd5 33.Nc3 33.Rd1! Nd3 34.a5! 33...Nd3 34.Rc2 Bc6! 35.a5 Kf7! 36.Re2 36.Ne2 Bd5 37.Nf4 Nxf4 38.Bxf4 Ke6 36...Nc1 36...Ke6 37.Nxe4 Bxe4 38.Rxe4+ Kd5 39.Re8 39.Re2 Bd4= 39...Nxb2 40.Rd8+ Ke4 41.Re8+ Kd5 42.Rd8+= 37.Re1 Nd3 38.Re2 Nc1 39.Re1 Nd3 ½–½

Photos from Round 13 for FIDE by Anna Shtourman
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