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Bjorn Brinck-Claussen vs Oscar Panno
"Claussen Effect" (game of the day Jun-30-2019)
Havana ol (Men) fin-A (1966), Havana CUB, rd 11, Nov-16
Nimzo-Indian Defense: Normal. Bronstein (Byrne) Variation (E45)  ·  0-1


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sac: 24...Rxe4 PGN: download | view | print Help: general | java-troubleshooting

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Kibitzer's Corner
Premium Chessgames Member
  al wazir: This game was played in 1966, but FIDE didn't adopt Elo ratings until 1970 (
Jun-30-19  newzild: Cute shot at the end to win the exchange.
Jun-30-19  morfishine: Claussen's poor development left him in a real pickle
Premium Chessgames Member
  AylerKupp: <al wazir> True. But Dr. Elo calculated and provided to FIDE rating lists for 1966 through 1969 so I consider these unofficial lists to be as accurate as the 1970s rating lists also calculated by Dr. Elo.
Premium Chessgames Member
  Breunor: Good one Morph!

Nice game by Panno to show how to counter very aggressive play by white.

Not surprisingly, computer thinks white starts falling behind with the aggressive 10 g4:

1) -0.41 (22 ply) 10...dxc4 11.Bxc4 Bxc4 12.bxc4 Nbd7 13.Bb2 Ne8 14.Ne4 Nd6 15.Nxd6 Bxd6 16.O-O Rc8 17.h3 Qe7 18.Rad1 Rfd8 19.a4 e5 20.dxe5 Bxe5 21.Qe4 f6

It prefers (basically evenly) developing one of the two bishops:

1) +0.13 (20 ply) 10.Bb2 Bd6 11.Bd3 Nbd7 12.O-O Re8 13.Qh3 Bb7 14.Rfd1 h6 15.Nfe2 Rc8 16.a4 e5 17.dxe5 Rxe5 18.f4 Rh5 19.Qg3 Nc5 20.Bc2

2) +0.12 (19 ply) 10.Be2 Bd6 11.Bb2 Nbd7 12.O-O Bb7 13.a4 Re8 14.cxd5 exd5 15.Ba3 Bxa3 16.Rxa3 Qe7 17.Ra2 Qb4 18.Rc1 Qxb3 19.a5 Ne4

But again failing to develop the bishops, he further errs (although obviously part of the same plan) with Qh3:

1) -0.90 (20 ply) 11...dxc4 12.Bxc4 Bxc4 13.bxc4 c5 14.Qf3 cxd4 15.exd4 Na6 16.O-O Rc8 17.Qe2 Bf6 18.Rd1 Re8 19.Be3 e5 20.dxe5 Bxe5 21.Nfd5 Bxc3 22.Nxc3 Nac5 23.g5

Better is again Be2:

1) -0.31 (22 ply) 11...Nf6 12.O-O h6 13.Bb2 Nbd7 14.Rad1 Bb7 15.Qg3 Rc8 16.Bd3 c5 17.cxd5 cxd4 18.exd4 exd5 19.Rfe1 Re8 20.Rc1 Ne4 21.Nxe4 Rxc1 22.Nf6+ Nxf6 23.Rxc1 Ne4 24.Qg2

Although both players don't play computer best moves.

But the move that drives the game away is 19 Ne4:

1) -3.11 (23 ply) 19...Nd7 20.Bd3 Bxd3 21.Qxd3 Ne5 22.Qg3 Nxg4 23.Qxg4 f5 24.Qh3 fxe4 25.O-O Qd6 26.Bh6 Rf3 27.Qg4 Rf7 28.Rac1 Bf8 29.Bf4 Qf6 30.Be5 Qf3 31.Qxf3 exf3

Better although still bad is Bh6:

1) -1.40 (24 ply) 19...Re8 20.O-O Nd7 21.Rfe1 Nf6 22.Qf3 Bxe2 23.Nxe2 Qd5 24.Qf4 Rad8 25.h3 Qd6 26.Qxd6 Bxd6 27.Bg5 Kg7 28.Nc3 Rxe1+ 29.Rxe1 Bxa3 30.Ne4 Be7 31.Ng3 Re8 32.Bxf6+ Kxf6 33.f3

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<This page contains Editor Notes. Click here to read them.>
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