64 square madness that some of us call chess...: E38 Nimzo-Indian: Classical, 4...c5 (1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Qc2 c5 5.a3 cxd4)

E38 Nimzo-Indian: Classical, 4...c5 (1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Qc2 c5 5.a3 cxd4)

I think this was the first time when not all of the opening moves were found in the LiveBook. The move 5...cxd4 had not been played at all. In my reference database the move 5...cxd4 had been played in 44 games and it had a score of 51.1%. The moves 5...Bxc3+ and 5...Qa5 were more often played and they were also more successful for the player controlling the black pieces. We followed previously played moves up to the move 7...O-O. Three games had reached that position and in two of them the move 8.e4 was played. One player had chosen to play 8.Bg5.

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Move	N	Result	Elo

Replay and check the LiveBook here

1.d4 Nf6 2.c4 e6 3.Nc3 Bb4 4.Qc2 c5 5.a3 cxd4 E38 Nimzo-Indian: Classical, 4...c5 6.axb4 dxc3 7.bxc3 0-0 7...b6 8.Bf4 Bb7 9.f3 Nc6 10.Bd6 Ne7 11.e4 Nc8 12.Bg3 Nh5 13.Bf2 e5 14.Ne2 h6 15.g4 Nf6 16.h4 Nd6 17.Ng3 Qc7 18.c5 Nc8 19.c4 d6 20.Qa4+ Kf8 21.cxd6 Nxd6 22.c5 Ranasinghe,S (1721)-Buddhika,A (1183) Narahenpita 2017 1-0 (52) 8.Be3N 8.e4 Nc6 8...d5 9.e5 Nfd7 10.f4 dxc4 11.Bxc4 Nxe5 12.Be2 Ng6 13.Nf3 Qc7 14.g3 Nc6 15.Bd3 b6 16.Kf2 Bb7 17.Re1 Rac8 18.Re2 Rfd8 19.Ba3 b5 20.Be4 Qb6+ 21.Kg2 f5 22.Bxc6 Qxc6 23.Re3 Zykiene,R (1912)-Sulikiene,K (1926) Kaunas 2015 1/2-1/2 (39) 9.Nf3 Qc7 10.Bg5 Ng4 11.c5 d6 12.cxd6 Qxd6 13.Be2 e5 14.h3 Nf6 15.Be3 b6 16.0-0 Bb7 17.Nd2 Rfc8 18.Qb3 Nd8 19.f3 Ne6 20.Rfd1 Nh5 21.Nc4 Qc7 22.Bf2 Nhf4 23.Bf1 Kuzmin,S (2249)-Egitov,A (2002) Novosibirsk 2007 1-0 (61) 8.Bg5 h6 9.Bh4 Nc6 10.Nf3 b6 11.e3 Bb7 12.Be2 Rc8 13.0-0 a5 14.b5 Ne7 15.Rfd1 Ne4 16.Rd4 Nc5 17.Rad1 f6 18.Bd3 Rc7 19.Rg4 Qe8 20.Bg3 e5 21.Bh7+ Kh8 22.Nxe5 fxe5 Schuffenhauer,R (1637) -Friedt,M (1766) Osnabrück 2011 1-0 (38) 8...a6 9.b5 9.Bf4= 9...a5 9...b6 feels stronger. 10.Nf3= b6 11.Bd4 11.c5= 11...Bb7 12.Ng5 12.c5!= keeps the balance. 12...g6 12...Re8 13.Be5 h6 13.Qd3 13.h4= d6 14.h5 13...h6 13...d6! 14.h4 Nh5 14.Nf3 14.h4= might be stronger. hxg5 15.hxg5 14...Re8 14...d6 15.Be3 Qc7 15.Qe3 Kh7? 15...d6!= 16.h4 16.Qf4± Kg7 17.Qd6 16...Ng4 16...d6 17.Qf4

17...f5 White should prevent . ..d6. 18.Ne5 Nxe5 19.Qxe5 White wants a kill. 19.Bxe5?! d6= 19...Rg8? 19...Qe7± 20.Qe3? 20.Qd6+- 20...a4?

20...Qe7! 21.Bxb6 Qc8 21...Qe8 might work better. 22.Bc7 d5 22.Qd4? 22.Qf4+- is more deadly. 22...a3? 22...d5± 23.f3? 23.Qd6+- 23...Re8? Black should try 23...d5! 24.e4 aiming for h5. e5 25.Qe3 fxe4 26.fxe4 Rf8 26...d6 was necessary. 27.Be2 Rf8 27.g3 27.h5+- hxg6+ would kill now. g5 28.Bc5 27...d6± 28.c5 28.h5± White wants to mate with hxg6+. g5 29.Ba7 28...dxc5? 28...Ra4!= and Black stays safe. 29.c4 Nd7 29.Bxc5+- Rf7 30.c4 But not 30.Bxa3?! Ra4± 30...Qg4? 30...a2± 31.Be2 Qe6? 31...Qxe4 32.Qxe4 Bxe4 32.g4? Better is 32.Rxa3+- Nd7 33.Rf1 32...a2 Precision: White = 8%, Black = 12%. . Loss on Time!? 32...Nd7= 33.Rxa3 33.Bxa3 Rf4= 33...Rf4 34.Rxa8 Bxa8 0–1

White	EloW	Black	EloB	Res

Kojjootti

1712

Vierjoki,T

1796

0–1

These two games are the highest rated games that I was able to find that reached the position after 5...cxd4.