@Master Om, just to save your time.
micawber wrote on 09/01/10 at 17:25:01:
Refutation 4C
5.Nf7 Bf2 6. Kf1 Qe7 7.Nxh8 d5 8.exd5 Nd4 9. d6 Qxd6 10. Nf7 and now Qe7 John Jerz's discovery who worked out the most important lines
7 white responses are examined:
4C6. 11. Kxf2 Ng4+ =John Jerz12. Ke1 Qf6 13. Rf1 Qh4+ 14. g3 Qxh2 15. d3 0.00
I looked at this variant several years ago, and found it being lost for White.
15...Qxg3+ 16.Kd2 Qe3+ 17.Kc3 Ne2+ 18.Qxe2 (after 18.Kb3 or 18.Kb4 White is mated)
18...Qxe2 and now b7-b5 is a really annoying threat to f7 knight. White will have to give up at least one piece with his king still being overexposed.
A. 19.Rh1 b5 20.Bd5 a5! -+
B. 19.Nd2 Ne3 -+
C. 19.d4 Qe4 20.Kb3 b5 21.Bxb5 Bd7 22.Nc3 Qb7 -+
Also, in another sub-variant of 4C
micawber wrote on 09/01/10 at 17:25:01:
4C5. 11.h3 Bh4 12.g3 Bxg3 13.Ng5
Black has a stunning
13...Ng4! -+
As to de Zeeuw's "
refutation №1", Black has
8...Bh4 and now
A. 9.Bxd5 Bg4 10.Qd2 (or 10.Bxc6 bc 11.Qd2 Nxe4! 12.de Qf6+ with soon mate) Nxd5 followed by 11...Nd4 is a disaster for White, e.g. 11.ed Qf6+ 12.Kg1 Nd4 or 11.h3 Nd4 12.hg Qf6+ 13.Kg1 Nd4 14.Nc3 Nfe2+
B. 9.ed Bg4
B1 10.Qd2 Nd4 11.Qe3 Nxc2 12.Qd2 Nd4! 13.Qe3 Be2+ 14.Qxe2 Nxe2 15.Kxe2 Qd7 -+
B2 10.dc Bxd1 11.cb Rb8 12.Nc3 (Ne4 was threatening) Bxc2 is decisive.
C. 9.Bb5 Bg4 10.Qd2 0-0-0 11.h3 allows 11...Nxe4!? to be played right now 12.de Qf6+ 13.Ke2 Nd4+, but 11...Qc5 could be even stronger, since micawber's 13...Nxe4! definitely works. Perhaps, White has to remove
bad knight c6. 10.Bxc6!? bc 11.Qd2, but it should not help either. 11...Nxe4! 12.de Qf6+ 13.Kg1 0-0-0 and now after 14.h3 de 15.Qxd8 Qxd8 16.Kh2 (otherwise 16...Qd1+ or 16...Qd4+ are murderous) Bf2 (threat Qh4) Black should win.
Refutation №2 1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.Ng5 Bc5 5.Nxf7 Bxf2+ 6.Kf1 Qe7 7.Nxh8 d5 8.exd5 Nd4 9.h3 Bh4 10.d6 Qxd6 11.Nf7 Qc5 12.Na3 e4 After 12...Ne4!? White escapes with 13.Nd6+! the beginning of long combination 13...cxd6 14.Qh5+ g6 15.Qxh4 Nf5 16.Bb5+ Bd7 17.Bxd7+ Kxd7 18.Qxh7+ Kc6 19.d4 Qxd4 20.Qc7+ Pointe! 20...Kxc7 21.Nb5+ Kd7 22.Nxd4 Nxd4 23.c3 Ng3+ 24.Kg1 Nde2+ 25.Kh2 Nxh1 26.Kxh1 Nxc1 27.Rxc1 Rf8 and in this endgame White is only slightly worse.
13.g4 Nh5!? (apart from 13...Be6, which also may be good) Black develops his knight to g3 or f4. Tactical basis is simple:
14.gxh5?? Qf5+ and mate in two. White has several possibilities:
A. 14.Rg1 Qe7 15.Rg2 (15.Kg2 Nf4+ 16.Kh2 Nf3+ 17.Kh1 Bf2–+)
15...Qf6+ 16.Kg1 Nf4 17.Qf1 (17.Nb5 Nxh3+–+; 17.Kh1 Nxg2 18.c3 Ne1 19.cxd4 Be6 20.Qe2 Bxf7 and despite temporarily equal material White is lost, e.g. 21.Qxe4+ Kd7 22.Qf5+ Qxf5 23.gxf5 Rf8 and Black begins his harvest; 17.c3 Nxh3+ 18.Kh2 Nf3+ 19.Kxh3 Be1 20.Qxe1 Nxe1 21.Be2 Qxf7–+)
17...Be6 18.Kh1 (18.Bxe6?? Nxh3+–+)
18...Bxc4 19.Nxc4 Qxf7 20.Rh2 Bg3;
B. 14.d3 e3 15.Bxe3 Ng3+ 16.Ke1 Nge2+ 17.Kf1 Qc6 18.Bb5 Nxb5 19.Nd6+ (19.Kxe2?? Qg2+ 20.Bf2 Qxf2#; 19.Rh2 Qf3+ 20.Bf2 Nbd4–+)
19...cxd6 20.Qxe2 Qxh1+ 21.Bg1+ Kf8 22.Nxb5 Qxh3+ 23.Qg2 Bxg4 with pair of bishops and an extra pawn in endgame;
C. 14.Rh2 Be6 C1. 15.Bxe6 Ng3+ 16.Kg2 e3 17.dxe3 Qc6+ 18.Kg1 Nde2+ 19.Kf2 Qxe6 20.Nd6+ (20.Ke1 Qxf7–+) 20...cxd6 21.Ke1 Qe4–+;
C2. 15.gxh5 Bxc4+ 16.Nxc4 Qxc4+ 17.Kg1 [17.d3 Qxf7+ 18.Kg2 (18.Kg1 Nf3+–+) 18...exd3 19.cxd3 Qd5+ 20.Kf1 Bg3–+]
17...Nf3+ 18.Kh1 Nxh2 19.Kxh2 Qxf7–+; and finally,
C3. 15.d3 Ng3+ 16.Kg2 ed -+
Refutation №3 (just developing John Jerz' variant from -0.36 to -1.5 at least
)
1.e4 e5 2.Nf3 Nc6 3.Bc4 Nf6 4.Ng5 Bc5 5.Nxf7 Bxf2+ 6.Kf1 Qe7 7.Nxh8 d5 8.exd5 Nd4 9.Be2 Bh4 10.c3? Nxe2 11.Qxe2 Bg4 12.Qb5+ Nd7 13.Kg1 But let's first take a closer look at
13.g3, because there are a few inaccuracies in Heisman’s CD
13…Qf6+ 14.Kg1 Bh3 15.Qe2 0–0–0 16.d4 (Not better is 16.d3 Rf8 17.Nd2
e4–+)
16...Rf8 17.Nd2 (or 17.Bf4 exf4 18.Nd2 f3 19.Nxf3 Bg4 20.Rf1 Bxf3 21.Qe6 Bg5 22.h4 Bd2 23.Kh2 g5–+)
17...exd4 “seems less accurate”, according to Heisman, but in fact is the strongest here
18.Nf3 Qxf3 19.Qxf3 Rxf3 20.Bf4 Bf6–+
13...Qf6 14.Qf1 (14.g3? Bh3 15.Qe2 to cover f3 15...0–0–0 16.d3 Rf8 17.Bf4 exf4 18.Nd2 Ne5–+)
14...Qb6+ 15.d4 0–0–0 at this point J.Jerz's analysis ends. It is clear that Black has an adequate attack for sacrifice, but let's look a bit further.
A. Simple development does not help:
16.Nd2 Rf8 17.Nf7 (17.Qd3 exd4 18.Nf3 Ne5 19.Qxd4 Qxd4+ 20.cxd4 Nxf3+ 21.gxf3 Bh3–+; 17.Nf3 exd4 18.Qd3 Ne5 transposes to 17.Qd3)
17...exd4 18.Nc4 Qg6 19.Nfd6+ Kb8 20.Bf4 Bg5–+;
B. 16.g3 (to secure e1 square for his queen)
16...Rf8 (Buecker in his chesscafe article, quoting Pastore?)
17.Nf7 (17.Qe1? exd4–+)
17...Qg6 along with other threats, it is h4-bishop protection.
18.Be3 (18.d6 Rxf7 19.Qc4 c6–+; 18.Nd2 Rxf7 19.Qe1 Bh3–+; 18.Qe1 Bh3 19.Be3 Qxf7 20.Nd2 exd4 21.cxd4 Qxd5 22.Qe2 Bf6–+) 1
8...exd4 19.Bxd4 Rxf7 20.Qe1 Re7 21.Qf1 Bg5–+;
C. 16.Qd3 Rf8 17.g3 (for 17.Nd2 exd4 18.Nf3 Ne5–+ see 16.Nd2) and Black can keep attacking
17...exd4 18.Qxd4 Bh3 19.Nd2 Qd6–+, or simply grab pieces back
17...Bg5 18.Bxg5 Qxb2 19.Nd2 Qxa1+ 20.Kg2 Qxa2 21.Rf1 Qxd5+ 22.Kg1 Rxh8 two pawns up, eventually.
D. 16.Nf7 Rf8 17.g3 Qg6 transposes to
16.g3 Comment on
refutation 4C2 After
13.h3 Black doesn't have to make a perpetual with
17...Nf3+, but should rather go on with
17...Qg6 (threat 18...Ne3+), e.g.
18.Kf1 0-0-0 19.d3 Re8, or
18.Qe1+ Ne3+ 19.Kf2 Qf6+! 20.Kxe3 0-0-0.
Next,
13.Kxf2 0-0-0 14.Nxd4 Bxd1 15.c3 is given as 0.00, however Black is winning here with either
15...Ng4+ 16.Ke1 Bf3! or
15...e3+ 16.Ke1 Bg4 Hi can you post this in a PGN format. I will be grateful to you.
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