Edward Winter notes that Yosef Porat was the victim of an anti-Turton move (or combination) by Bent Larsen in the 1956 Olympiad. What is an anti-Turton? As Heidenfeld notes (see Winter's article for details):
It consists in forcing the attacker who wishes to double two pieces on the same gait in such a way as to have the stronger piece in front and the weaker behind (called the Turton in the jargon of problemists) into playing the weaker piece across the so-called “critical square”... and thus into reversing the planned line-up.
The game is:
Porat, Yosef - Larsen, Bent
12th Chess Olympiad, Moscow, 1956, 6th round (preliminaries)
Source: Olimpbase.
1.Nf3 f5 2.c4 Nf6 3.Nc3 g6 4.b3 Bg7 5.Bb2 d6 6.d4 c6 7.e3 Qa5 8.a3 O-O 9.Be2 e5 10.b4 Qc7 11.d5 h6 12.c5 e4 13.Nd4 dxc5 14.Qb3 cxd4 15.d6+
15...Be6
Anti-Turton. 15...Qf7 (the other possible move) allows 16.Bc4, to be followed by 16...dxc3 17.Bxf7+ Rxf7 18.Bxc3, when Black has three pieces for the queen.
16.Qxe6+
The point behind 15...Be6: the white queen was forced to move beyond the critical square (c4), so Bc4 will no longer pin the black queen to the king after Black plays Qf7.
16...Qf7 17 Qxf7+ Rxf7 18 exd4 Rd7 19 d5 Nxd5 20 Bc4 Kh7 21 Bxd5 Bxc3+ 22 Bxc3 cxd5 23 g4 Rxd6 24 gxf5 gxf5 25 Rd1 Nc6 26 b5 Nd8 27 f3 Ne6 28 fxe4 fxe4 29 Rf1 Ng5 30 Rf5 d4 31 h4 Nf3+ 32 Ke2 Rc8 33 Bb4 Rg6 White resigns (0-1).
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