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Charlie B Nettleton vs Roy Phillips
4NCL (2017/18), England ENG, rd 3, Jan-13
Zukertort Opening: Pirc Invitation (A04)  ·  0-1

ANALYSIS [x]

FEN COPIED

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Kibitzer's Corner
May-25-19
Premium Chessgames Member
  al wazir: I got 19...Nxf2 20. Kxf2 fxg3+, but I wanted to played 21...g2 right away. After 22. Rg1 Qxh2 23. Nf3 Bg3+ it comes to much the same thing.
May-25-19  olinart: Got it, at least up to move 27 where white took a different tack. NxF2 is needed to open lines for the Black Q, and Black has rooks in place to exploit the open king side.
May-25-19  Cybe: 17. Nfg5? 17. N:d6 leeds to draw.
May-25-19  goodevans: I went with <19...Ne3+>. If <20.fxe3> then + 21.Kh3 Qh5+ 22.Kg2 f3+ 23.Kf1 dxe3> gives black a winning position.

Better though is <20.Kg1>. Now <20...Qxe2> looks strong but what I failed to see was that white can thwart black's attack with <21.Nxd6 cxd6> (forced else 22.Ndf7+ mates) <22.Nf7+ Rxf7 23.Qxf7 Rg8 24.Qxf4>.

May-25-19  goodevans: Actually there is a way to make <19...Ne3+> work. After <20.Kg1> you sac the exchange with <20...Rxe4> before playing <21...Qxe2>. That avoids the nasty check on f7 and gives black a strong attack.
May-25-19  patzer2: In today's Saturday (19...?) puzzle, the weak position of the White King begs for a demolition sacrifice leading to mate.

Stockfish 10 indicates three combination (i.e. sham) sacrifices (19...Rxe4, 19...Ne3+ and 19...Nf2+) are clearly decisive:

( [Stockfish 10 64] 34:-9.98 19...Rxe4 20.Nxe4 Ne3+ 21.Kg1 Qxe2 22.Qe6 Nd1 23.Rxd1 Qxd1+ 24.Kg2 f3+ 25.Kh3 Qxh1 26.b6 axb6 27.Nxd6 cxd6 28.Kg4 Qxh2 29.Qe7 Rg8 30.Kxf3 Qh1+ 31.Kg4 h5+ 32.Kg5 Qf3 33.Qd7 Qxf2 34.Qxd6 Ra8 35.Kg6 Qe2 36.Qd5 Qe8+ 37.Qf7 Qxf7+ 38.Kxf7 Rxa2 39.Kg6 Rg2 40.Kf5 Rxg3 41.Ke4 Rg4+ 42.Kf3 Kh7 43.Kf2 )

( [Stockfish 10 64] 33:-8.75 19...Nxf2 20.Kxf2 fxg3+ 21.Ke1 Bf4 22.Qd5 Bxc1 23.Nf7+ Qxf7 24.Qxf7 Rxf7 25.hxg3 Ref8 26.a4 Be3 27.Nd2 Bf2+ 28.Kd1 Bxg3 29.Kc2 Rf2 30.Kd1 Kg8 31.Nb3 Bd6 32.Rh5 R2f5 33.Rxf5 Rxf5 34.Nxd4 Rf1+ 35.Kc2 Ra1 36.Nf5 Rxa4 37.Nxd6 cxd6 38.Kb3 Ra5 39.Kb4 )

( [Stockfish 10 64] 33:-8.67 19...Ne3+ 20.fxe3 Qxe2+ 21.Kh3 Qh5+ 22.Kg2 f3+ 23.Kg1 dxe3 24.Qd1 Rxe4 25.Nxe4 Qh3 26.Qf1 f2+ 27.Nxf2 exf2+ 28.Qxf2 Rxf2 29.Kxf2 Qf5+ 30.Ke2 Qe5+ 31.Kf3 Qd5+ 32.Kg4 g6 33.Kh3 Qe6+ 34.Kg2 Qxa2+ 35.Kh3 Qe6+ 36.Kg2 Qd5+ 37.Kh3 Qf5+ 38.Kg2 Qxd3 39.Rce1 Qd5+ 40.Kh3 Qxb5 41.Rhf1 h5 42.Rf3 g5 43.Rfe3 Kg7 44.Kg2 g4 45.Re7+ Bxe7 46.Rxe7+ Kg6 )

My pick was 19...Ne3+ -+.

P.S. So where did White go wrong? Stockfish 10 indicates the decisive error was 17. Nfg5, allowing 17...Bxg2 18. Kxg2 Ng4! -+ (-3.57 @ 29 ply).

Instead, Stockfish 10 recommends complicating with 17. Qc4 fxg3 ∓ (-1.59 @ 34 ply). However, 17. Qc4 is a computer move that is difficult to see over the board and even with best play may not assure White's survival.

For an earlier improvement, instead of 11. Rac1 f4! ⩱ to ∓ (-0.69 @ 28 ply, Stockfish 10), White can counter Black's flank attack and maintain a positional advantage by taking action to stengthen the Queen-side and the center with 11. b5 Nb8 12. e3 ⩲ (+0.76 @ 30 ply, Stockfish 10).

May-25-19
Premium Chessgames Member
  agb2002: Black has a bishop for a knight.

White is about to play Nf3, closing the f-file and the diagonal d1-h5.

Black has Ne3+ and Nxf2, the latter looking somewhat simpler: 19... Nxf2 20.Kxf2 (20.Nxf2 Qxg5 with the double threat fxg3 and Rxe2; 20.Nxh7 Nxe4 21.Nxf8 Qxe2+ 22.Kh3 Nf2+ 23.Kg2 f3+ 24.Kg1 Nh3#) 20... fxg3+ 21.Ke1 (21.Kg1 gxh2+ and mate in two; 21.Kg2 gxh2, with the threat Qg4+, looks winning) 21... Rxe4 (due to an eventual Nf7+) 22.Nxe4 (22.dxe4 Qxg5 followed by g2) 22... g2 23.Rg1 Qxh2 seems to win at least two pawns.

May-25-19
Premium Chessgames Member
  cormier:


click for larger view

Analysis by Houdini 4

11...Nd8 12.e3 Ne6 13.Qc2 Rb8 14.Nh4 a6 15.a4 Ra8 16.Nhf3 Bd7 17.Rfb1 Rab8 18.Bc3 Qf7 19.Nh4 Nh5 20.Nhf3 Nf6 21.Nh4 = (0.00) Depth: 24 dpa done

May-25-19
Premium Chessgames Member
  cormier:


click for larger view

Analysis by Houdini 4 d 23 dpa done

1. = (-0.20): 17.Nxd6 cxd6 18.Bxh3 Qxh3 19.Rc7(T) Qh5 20.Qc4 Rxe2 21.Rc8 Ree8 22.Rxe8 Rxe8 23.Kg2 h6 24.Qxd4 fxg3 25.hxg3 Re2 26.Re1 Rxe1 27.Nxe1 Qxb5 28.Qxd6 Qd5+ 29.Qxd5 Nxd5 30.Kf3 Kg8 31.Kg4 g6 32.Nf3 Kg7 33.Ne5 Kf6 34.Nd7+ Ke6 35.Nc5+ Ke5 36.Nxb7 Kd4 37.Kf3 Nc3 38.a3 g5 39.g4 Kxd3 40.Nc5+ Kd4 41.Ne6+ Kd3

2. = (-0.20): 17.Bxh3 Qxh3 18.Nxd6 cxd6 19.Rc7(T)

May-25-19  King.Arthur.Brazil: I agree that this is not a usual position and it is not easy to find the best move. I didn't succeed because I looked for a sacrifice like 19...Rxe4 which seems incorrect. Following the game, after 21.Ke1, I supposed g2 directly. It seems a little early, I saw that after 23. Rg1 the move Bxg5? is bad because of 24. Rxg5 Qh4+ 25. Rg3 Qxh2 26. R3g2 and all is over. Anyway, I didn't like Qxh2 because 24.Nf3 seemed to defend everything. Once more, the 24.Bg3+ is fundamental (hard to see it, at move 19...) Rxf3 therefore, it was expected! 26...Re3 (other simply and strong move). Although after 28. Rf7 I was tempted for the combination 28... R3xe4 29.dxe4 Bf2, with the threat of 30... Qc3#. But afterwards I saw that white can play 29.Rf3 and 29...Rxe2+? is impossible because of 30.QxRe2 and black cannot move Rxe2?? due to 31.Rf8#. I didn't see a victory comming soon. However, white position is almost lost but the only move he still had was 29.Qb3! (best that 29.Rf3 which lost immediately Qxa2+ ,30.Kxe2 Qxc2#). Including that if 29... Rxe4?! 30. Rxg2... The black will win (yes) but it is not so clear yet. That is my point.
May-25-19
Premium Chessgames Member
  OhioChessFan: <KAB> I went with 19...Rxe4 also and think that wins. 20. Nxe4 Ne3+ opens everything up and I don't see White holding. Say 21. Kg1 Qe2 and I think it's clear White won't survive.
May-25-19  RandomVisitor: After 6...0-0 white plays 7.Qb3 which is followed by 7...Kh8. The queen stay on b3 until after move 19, when the game is effectively over.

Can white play a better move? The computer "thinks" he can:


click for larger view

Stockfish_19052509_x64_modern:

<39/58 1:17:25 +0.34 7.0-0> h6 8.Nc3 Qe8 9.Nd2 a6 10.e3 c6 11.a4 Be6 12.a5 Nbd7 13.f4 Qf7 14.Nf3 Rae8 15.Bb2 Bd8 16.Re1 Nh5 17.Qc2 Bf6 18.Rab1 g5 19.Ne2 Qg6 20.Kh1 Bf7 21.c5 Bd5 22.Nc3 Bxf3 23.Bxf3 dxc5 24.bxc5 exf4 25.exf4 g4 26.Bg2 Rxe1+ 27.Rxe1 Qf7

39/55 1:17:25 +0.23 7.Nc3 h6 8.0-0 Qe8 9.Ne1 a6 10.f4 c6 11.a4 Be6 12.Nf3 Nbd7 13.a5 Qh5 14.Qc2 Rae8 15.Bd2 Bd8 16.Rae1 Qf7 17.Nd1 Ng4 18.Bc3 Bc7 19.Qd2 Qh5 20.Nf2 Nxf2 21.Kxf2 Bb8 22.Kg1 Ba7+ 23.Kh1 e4 24.dxe4 fxe4 25.Nh4 Bxc4 26.Qxd6

39/57 1:17:25 +0.17 7.Bb2 Be6 8.Nc3 Qe8 9.Ng5 Bc8 10.0-0 c6 11.e3 h6 12.Nf3 Be6 13.Nd2 a6 14.a4 d5 15.cxd5 cxd5 16.e4 fxe4 17.dxe4 dxe4 18.Ndxe4 Nxe4 19.Bxe4 Nc6 20.Nd5 Rd8 21.b5 Bc5 22.bxc6 bxc6 23.Nc7 Rxd1 24.Nxe8 Rxf1+ 25.Rxf1 Rxe8 26.Rc1 Bd4 27.Bxd4 exd4 28.Rxc6 Bd7 29.Rd6 Bxa4 30.Rxd4 Bb5 31.Bd5+ Kh7

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