Copyright (c) 2013 John L. Jerz

Spassky-Fischer, 1972 Championship, game 11
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The Case for Using Probabilistic Knowledge in a Computer Chess Program (John L. Jerz)
Resilience in Man and Machine

1.e4 c5 2.Nf3 d6 3.d4 cxd4 4.Nxd4 Nf6 5.Nc3 a6 6.Bg5 e6 7.f4 Qb6 8.Qd2 Qxb2 9.Nb3 Qa3 10.Bxf6 gxf6 11.Be2 h5* 12.0-0 Nc6 13.Kh1 Bd7
 
Here Spassky plays the innovation 14.Nb1. What does Rybka 3 think?
 

[-0.03]  d=29  14.Nb1 Qb4 15.Qe3 Ne7 16.a3 Qa4 17.Nc3 Qc6 18.Na5 Qc7 19.Nc4 Bc6 20.Rad1 Rd8 21.f5 e5 22.Nb6 h4 23.Qf2 Bh6 24.a4 Kf8 25.a5 Bg5 26.Bc4 Nc8 27.Ncd5 Bxd5 28.Bxd5 Kg7 29.h3 307:10:58
 
[-0.08]  d=27 14.Nb1 Qb4 15.Qe3 Ne7 16.a3 Qa4 17.Nc3 Qc6 18.Na5 Qc7 19.Nc4 Bc6 20.Rad1 Rd8 21.f5 e5 22.Nb6 h4 23.Qf2 h3 24.g3 Bh6 25.a4 Bg5 26.Bc4 Nc8 27.a5 Nxb6 28.axb6 Qd7
 
The move 19...Bc6 in the above line seems unusual - a deeper look:
 
[-0.05]  d=25  19...Bc6 20.Rad1 Rd8 21.f5 e5 22.Nb6 h4 23.Qf2 h3 24.g3 Bh6 25.Rd3 Kf8 26.Bf3 Kg8 27.Rb1 Kg7 28.Rbd1
 
[-0.05]  d=24  19...Bc6 20.Rad1 Rd8 21.f5 e5 22.Nb6 Bh6 23.Qf2 h4 24.Rd3 Bg5 25.Rfd1 h3 26.g3 Kf8
 
*After 11.Be2:

Rybka 3:

[-0.56] d=23 <11...h5> 12.0-0 <h4> 13.Rf3 Nd7 14.Rd1 <h3> 15.Rxh3 Rxh3 16.gxh3 Qb4 17.f5 Qb6+ 18.Kh1 Ne5 19.fxe6 fxe6 20.Qf4 Bg7 21.Bh5+ Kf8 22.Rg1 Qc7 23.Qg3 b5

[-0.44] d=22 11...Be7 12.0-0 h5 13.Nd1 Qa4 14.Nb2 Qc6 15.Nc4 b5 16.Ne3 Bd7 17.f5 Qb6 18.Kh1 Nc6 19.a4 bxa4 20.Rxa4

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