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Johannes van den Bosch vs Max Euwe
Amsterdam (1936), Amsterdam NED, rd 3, Oct-??
Sicilian Defense: Closed. Chameleon Variation (B23)  ·  0-1



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Kibitzer's Corner
Sep-24-19  qkxwsm: Pretty tricky: 17...c5 doesn't work since 18. Qg3! breaks the pin (if 18...Be5? 19. Rd8+! wins for white in fact.)
Sep-24-19  namesrue: 17...c5 18. Qg3 Qa5+ is still wins for black, although obviously the game line is better.
Premium Chessgames Member
  agb2002: Black is one pawn up.

White threatens Bxg7.

The bishop on g7 x-rays the white queen. This leads to 16... Rxd4 17.Rxd4 Qb6 and the rook on d4 is lost (18.Rb4 Bxc3+).

Sep-24-19  saturn2: <gkxwsm> Maybe 17..c5 is sill working

16...Rxd4 17. Rxd4 c5 18. Qg3 Be5 19. Rd8+ Kg7

Sep-24-19  saturn2: or maybe not
20. Rxc8 Bxg3 21. Rxc7 Bxc7 
Sep-24-19  zb2cr: Black wins a piece with 16. ... Rxd4; 17. Rxd4, Qb6.
Sep-24-19  Walter Glattke: Interesting was 16.Be5
Premium Chessgames Member
  patzer2: I had difficulty finding today's Tuesday puzzle solution 16...Rxd4 17. Rxd4 Qb6 -+, which wins a piece with a decisive pin.

Only after I flipped the board, and looked at it from the Black side, was I able to see it.

White, in this game, also had difficulty seeing the combination, as he missed it when he blundered and played 16. Qc3?? to allow 16...Rxd4 17. Rxd4 Qb6 -+ (-7.68 @ 32 ply, Stockfish 10).

Instead of 16. Qc3??, White could have held the game level with 16. Qe3 = (0.00 @ 35 ply, Stockfish 10).

Sep-24-19  goodevans: Count me among the patzers who got it wrong with 17...c5.

<saturn2: <gkxwsm> Maybe 17..c5 is sill working 16...Rxd4 17. Rxd4 c5 18. Qg3 Be5 19. Rd8+ Kg7>

click for larger view

The suggestion in your next post of <20.Rxc8> doesn't work because of <20...Qa5+>.

Much better is <20.Rh7+!>. Obviously black can't take the R and after <20...Kf6 21.Qh4+ Ke6 22.Bc4+> his K will be forced into the open where he won't survive long.

Turns out I got much more out of today's puzzle by getting it wrong than if I'd got it right.

Premium Chessgames Member
  patzer2: According to our Opening Explorer 9. h4, allowing 9...d5 =, has strongly favored Black.

Instead, White has had more success with the more popular move 9. 0-0-0 ⩲ as in the draw in Carlsen vs Nakamura, 2018 or White's win in Vitiugov vs A Valsecchi, 2018.

Sep-24-19  AlicesKnight: Found the game continuation. Deceptive in its simplicity....
Sep-24-19  malt: Black snaffles a piece with 16...R:d4

17.R:d4 Qb6 18.Rd8+ Q:d8 19.Q:c6 Rb8

Sep-24-19  TheaN: Went with 17....c5 after somehow glancing at Qg3 but dismissing it as a defense. Feel like I'm getting sloppy, had a few nasty misses in a row.
Sep-24-19  mel gibson: I don't get it - there's no decisive win
although the computer says that Black is ahead.
Sep-24-19  TheaN: <mel gibson: I don't get it - there's no decisive win although the computer says that Black is ahead.>

Did you perhaps miss that in all ensuing trades Black snatched the bishop on d4 :>? The idea of Qb6 is that Black will win back the rook on d4 fully.

Sep-24-19  RandomVisitor: <mel gibson>After 16...Rxd4 17.Rxd4 Qb6

click for larger view

Black is down the exchange but White must lose the rook now sitting on d4 - two black attackers and only one White defender. The rook cannot move because it is pinned to the Queen. White cannot add a defender.

If White tries a trick like 18.Rb4, then Black captures 18...Bxc3+ with check and tempo.

Sep-24-19  saturn2: <namesrue: 17...c5 18. Qg3 Qa5+ is still wins for black>

How after 19 Rd2?

Premium Chessgames Member
  dorsnikov: I'm embarrassed that I missed such an obvious combination. Dynamic vision is the key.
Sep-24-19  RandomVisitor: <patzer2>The silicon monster thinks things are fairly even at move 9:

click for larger view


<49/59 5:10:47 +0.13 9.h4 d5 10.exd5> Nxd5 11.Nxd5 Qxd5 12.c4 Qe4 13.Bf3 Qe5 14.Nxc6 bxc6 15.Rd1 Qxb2 16.Qxb2 Bxb2 17.Bxc6 Rb8 18.0-0 Ba6 19.Bxa7 Rb4 20.Rfe1 Rc8 21.Bb5 Bxb5 22.cxb5 Rxb5 23.Rxe7 Bf6 24.Red7 Ra5 25.Be3 Rxa2 26.h5 gxh5 27.R7d6 Ra1 28.Rxa1 Bxa1 29.Rh6 Bg7 30.Rxh5 Rc3 31.Kh2 Bf6 32.Rd5 Rc6 33.Rd1 h5 34.Rd7 Kg7 35.g3 h4 36.gxh4 Bxh4

49/69 5:10:47 0.00 9.0-0-0 Ng4 10.Bxg4 Bxg4 11.f3 Be6 12.Nxe6 fxe6 13.Bh6 Rc8 14.Bxg7 Kxg7 15.h4 Qa5 16.f4 Qc5 17.h5 g5 18.g3 Na5 19.e5 Nc4 20.h6+ Kf7 21.Qe2 Qb4 22.Na4 Qxa4 23.Qh5+ Kg8 24.Qxg5+ Kf7 25.Qh5+ Kg8 26.Qg4+ Kf7

48/17 5:10:47 0.00 9.0-0 d5 10.exd5 Nxd5 11.Nxd5 Nxd4 12.c4 Nf5 13.Rad1 Be6 14.Bf4 Bxd5 15.cxd5 Nd4 16.Be3 Nf5

48/67 5:10:47 0.00 9.h3 d5 10.0-0-0 dxe4 11.Nxc6 Qxd2+ 12.Bxd2 bxc6 13.f3 Rb8 14.fxe4 Nxe4 15.Nxe4 Bxb2+ 16.Kb1 Bg7+ 17.Kc1

Sep-24-19  goodevans: <saturn2: <namesrue: 17...c5 18. Qg3 Qa5+ is still wins for black>

How after 19 Rd2?>

<19...Bxb2>, apparantly threatening 20...Bc3, looks like it might do the business for black but the precarious position of black's K means it falls short.

click for larger view

For example, after <20.Qf4 Bc3 21.Kf1> black can't take the R because <22.Qe5> would be fatal.

So you're right, <17...c5 18.Qg3 Qa5+> doesn't win for black.

Premium Chessgames Member
  patzer2: <Random Visitor> Thanks! Not quite sure why the computer assesses 9. h4 as equal to or slightly better than 9. 0-0-0.

I like 9. 0-0-0 because it's a straight forward plan (i.e. attack and mate the castled Black King) with lots of available example games from master play on how to proceed.

Sep-24-19  TrczkWszczinsk: Pin and win! Easier (for me) than yesterday...
Sep-24-19  5hrsolver: I had 17...c4 but 17...Qb6 is the right move.
Sep-25-19  saturn2: <goodevans> yes, thx
Sep-25-19  mel gibson: <Did you perhaps miss that in all ensuing trades Black snatched the bishop on d4 :? The idea of Qb6 is that Black will win back the rook on d4 fully.>

I didn't study it enough -
it was a boring game.

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