(1) Yurenok,M - Baruch,A [E81]
4NCL, Div2, 01.05.2016

1.d4 g6
As when playing White, here Andy Baruch plays a flexible opening move which may transpose to a range of KP or QP openings depending what White does.

2.c4 Bg7 3.Nc3 d6 4.e4 c6
Again keeping options open. Black may develop the knight to f6 returning to more standard play, or continue with Nd7 and e5, or still remain non-commital as in the game continuation.

White also plays flexibly and after this move a number of systems could arise although principally the Samisch variation is the most likely. [5.Nf3 is another flexible move although Black can continue to avoid playing Nf6 and easily achieve the central advance e5. Two examples are 5...Bg4 (or 5...Nd7 6.Be2 e5 7.0-0 Nh6 Lupulescu-Rogozenko, ROM-tch Mamaia 2012.) 6.Be2 Nd7 7.0-0 Qc7 8.Be3 e5 Nyback-Rehn, Heart of Finland open Jyvaskyla 2006.]

The pawn set up on the queens-side that characterises the Byrne variation of the Samisch KID. The game would transpose to that line if White now plays 6. f3 and Black replies 6...Nf6.

Sensible development by White. Alternatively White can go more "all out" with [6.f4 b5 7.Nf3 Nf6 8.e5 Ng4 9.Bg1 0-0 10.Qb3 and a very double edged game results as in Ward-Buckley, 4NCL 2003.; instead 6.Qd2 may be met by 6...b5 (but 6...Nf6 7.f3 and now the commital 7...0-0 transposing to the Byrne variation proper can be dangerous since White can commence an attack with 8.Bh6 b5 9.0-0-0 when h4-5 might follow.) ; 6.a4 is often played here but Black seems able to achieve a decent game by blocking the queens-side with 6...a5 as recommended long ago by Kings Indian guru GM Geller.]

6...b5 7.Nge2 Nd7 8.0-0 Ngf6 9.f3 0-0
Finally the game reaches a standard tabiya of the Byrne variation where White has a wide range of plans available.

The most common and natural move but White may also play: [10.b3 e5 11.d5 cxd5 12.cxd5 Portisch-Spasov, Manila Ol 1992.; 10.Rc1 e5 11.a3 Karpov-Kasparov, World Ch 1990.; 10.cxb5 axb5 11.b4 Geller-Fischer, Havana 1965.]

Probably the soundest way to play as Black. Alternatively the sharper way of handling this position is [10...bxc4 11.Bxc4 Nb6 12.Bb3 (12.Bd3 Bb7 Porkolab-Joenhede, IECC CL-2 2005.) 12...a5 13.Na4 Nfd7 Ostermeyer-Eslon, Biel GM-17 1984. (or 13...Ba6 Mishra-Suvrajit, IND-ch Nagpur 1999.) ]

White has developed in sound classical style but not actually achieved any sort of advantage. This is confirmed by the number of other options played here, even by highly rated players, where Black retains a fully playable game with even chances. [Examples include 11.b3 exd4 12.Nxd4 Bb7 13.Rac1 Ne5 14.Rfd1 bxc4 15.Bxc4 d5 16.exd5 cxd5 17.Bf1 Re8 18.Na4 Ned7 19.Nc6 Bxc6 20.Rxc6 a5 21.Bf2 Rb8 22.Nc3 Ne5 23.Ra6 Qc7 24.Nxd5 Nxd5 25.Qxd5 a4 Seirawan-Christiansen, USA-ch Chandler 1997.; 11.Rac1 exd4 12.Nxd4 Bb7 13.cxb5 cxb5 14.b3 Re8 15.Bf2 Ne5 16.Be2 d5 17.exd5 Nxd5 18.Nxd5 Qxd5 19.Qf4 h5 20.Rcd1 Ng4 21.Nxb5 Be5 22.Qc1 Bxh2+ 23.Kh1 Nxf2+ 24.Rxf2 Qe5 25.Nd6 Bf4 Danelia-Douriet Duany, Barbera del Valles 2008.]

An interesting novelty in this position which sets White new problems to solve. Previously several games have shown that Black gets an even game with [11...Bb7 ; and also 11...Qc7 ; but 11...Re8 ; and 11...exd4 are a little better for White.]

White responds well controlling the b4 square and threatening b4.

But Black follows up very badly with a move that, although increasing the queens-side pressure, should loose swiftly. Better were [12...Qc7 retaining the central tension or; 12...exd4 13.Nxd4 Qc7 releasing the tension but opening the Bg7 diagonal. In both cases Black is slightly worst but has a typical playable dynamic KID game.]

[Also feasible was the insertion of a capture first with 13.dxe5 which seems a stronger line eg 13...dxe5 14.b4 Qxa3 and although a little murky in each case White has a number of ways to win such as 15.Bxb6 (and also 15.Nb1 Qa4 16.Bxb6 bxc4 17.Bxc4 ) 15...Qxb4 16.c5 ]

13...Qxa3 14.Ra1?!
Whilst this eventually wins the Black queen much more emphatic was [14.d5 Nxc4 15.Bxc4 bxc4 16.dxc6 and although Black has won a pawn this time his game is lost. For example 16...Qxb4 (16...Rb8 17.Ra1 Qxb4 18.Rfb1 Qxb1+ 19.Rxb1 Rxb1+ 20.Nxb1+- is a better version of the main game as Black has weak pawns.) 17.Rb1 Qa5 18.Bb6 Qa3 19.Ra1 Qb3 20.Rfb1 Be6 21.Rxb3 cxb3 22.Qxd6+- ; Here 14.Nb1 is not so clear as after 14...Qa4 15.cxb5 axb5 16.dxe5 Nfd7 17.exd6 Be5 White has won a pawn but the position remains highly unbalanced.]

Now Black has snatched two pawns.

15.Rfb1 Nxc4
Now three pawns.

[16.Rxb4 is much weaker as White is struggling after 16...Nxd2 17.Bxd2 a5 18.Nxb5 cxb5 19.dxe5 (19.Rxb5 a4-/+ ) 19...Nd7-/+ ]

16...Qxb1 17.Rxb1
A difficult choice for White. [Very poor is 17.Qxb1 Nxe3 18.Qc1 exd4 19.Nxd4 and Black with too much material for the queen wins with 19...Nxe4-+ ; 17.Nxb1 is a little better but White has only a small advantage following 17...Nxe3 18.dxe5 Nd7 (18...Nfg4 19.fxg4 Nxg4 20.Qxc6 Rb8+/= ) 19.Qxe3 Nxe5~~ despite White's material advantage due to Black active pieces and White's passive ones.; 17.Bxb1 looks best with a significant edge for White but not a clear winning position following 17...Nxe3 18.dxe5 Nfg4 19.fxg4 Nc4+/- ]

17...Nxe3 18.Qxe3 exd4 19.Nxd4 c5
[19...Bd7 looks a better option in connecting rooks and supporting the pawns on c6 and b5. The text is not bad, though, and despite Black having only a rook and 3 pawns for the queen the active Black pieces combined with the threat to advance the 3 connected passed pawns make the game very tricky for White.]

Again a very tough choice for White but both [20.Nc6 Bd7 21.Ne7+ Kh8 22.Qf4 b4 23.Ncd5 Nxd5 24.Nxd5+/- ; and 20.Nde2 Bd7 21.Qd2 b4 22.Nd1+/- look stronger ways to try and capitalise on the material advantage.]

20...Be6 21.Qd2 b4 22.Nd5?
White tries the idea of giving back some material to blockade the advancing pawns but instead [22.Na4 is more effective (just) in holding back the pawns 22...Nd7 23.Ne3 Bd4 24.Kf1 Rfb8 25.f4 and White has the threat of f5 to disrupt Black's game.]

22...Bxd5 23.exd5 Nxd5
Now White has hardly any useful moves.

Certainly blockading the pawns but losing time as the knight jumps to c3 with great effect. [24.Rf1 seems the only way to generate some decent play for White with the idea of f4-f5 and if 24...Nb6 25.Nxb4 cxb4 26.Qxb4 Nd5 27.Qxd6 simplifies the game with material now balanced.]

24...Nc3 25.Re1
[If 25.Rb3 a5 26.Qxd6 Rfd8 and the rook on b3 only helps the pawn advance via a4. And if 27.Qxc5 Black restores the material balance via 27...Rdc8 28.Bxf7+ Kxf7 ]

Another pawn advances with tempo.

Now White is losing so [26.Bxd5 had to be tried although Black remains with the slightly superior game after 26...Rad8 27.Bxf7+ Kxf7 28.Qf2 Rd5 (or if 28...Rc8 29.Qf1 ; and if 28...a5 29.Qxc5 ) ]

26...a5 27.Kh1
Minimising the impact of a potential Bd4+ but there is nothing better. With R+4P for the queen Black is now easily winning as the pawn avalanche on the queens-side, supported by the Nc3 and Bg7, will cost White material.

27...a4 28.Re3
[28.Qe3 Rfc8 and the a-pawn rolls onwards.]

28...a3 29.Rxc3
[29.Na1 c4 30.Qc2 a2 31.Re1 Rfb8 is no hope either.]

29...Bxc3 30.Qxd5
Sacrificing material allows White the hope of Bc4 but is not allowed even that chance.

30...a2 31.g3 Rfd8 32.Qxc5 a1Q
[32...b3 33.Ne3 a1Q is also an easy win.]

33.Nxa1 Rxa1
[33...Bxa1?! is bad as it gives White the chance to hang on in a worst position with 34.Bc4 Bc3 35.Qe7 ]

34.Qc4 Rdd1
Winning more material so the game is effectively over.

[Or 35.Kg2 Rxf1 ]

35...Rxf1+ 36.Kg2 Rfd1 37.f5 Kg7 38.fxg6 hxg6 39.h4
White is a rook down so presumably plays on due to time issues and prefers to be mated.

39...Rd4 40.Qb5 Rd2+ 41.Kf3 Rad1 42.h5 Rd5 43.Qa4 R1d3+ 44.Ke2 Rd2+ 45.Ke3 Rxh5 46.g4 Rh3+ 47.Kf4 Rd4+
[47...Rd4+ 48.Kg5 Bd2# (48...f6# ) ] 0-1