(1044) Portisch - Petrosian
1974

XABCDEFGHY
8-tR-+-+-+(
7+-+-+-+-'
6-zP-+-zp-+&
5+-+-+k+p%
4-+-mK-+-zP$
3+-+-+-+-#
2-+-+-tr-+"
1+-+-+-+-!
xabcdefghy


1.Ra8 Rb2 2.Kc5 Rc2+ 3.Kb5 [Transposition]

3...Rb2+ 4.Ka6 [4.Kc6 Rc2+ ECE ends the analysis here  5.Kb5+– Transposition]

4...Ra2+ [Nunn 4...Kg4 5.b7 Kxh4 6.b8Q Rxb8 7.Rxb8 Kg3 8.Kb5 h4 9.Rg8+ Kf2 10.Rh8 Kg3 11.Kc4 h3 12.Kd3 h2 13.Ke2 Kg2 14.Rg8+ Kh3 15.Kf2+–]

5.Kb7 Rg2 6.Ra4 [6.Ra5+ Kg4 7.Kc6 (7.Ka7? Kxh4 8.b7 Rb2=) 7...Rc2+ 8.Rc5 Rb2 9.Rb5 Rc2+ 10.Kd7 Rd2+ 11.Ke7 Re2+ 12.Kf7 Rd2 13.b7 Rd8 14.b8Q Rxb8 15.Rxb8+–]

6...Rg4 7.Ra5+ Kf4 8.Kc6 Rg8 9.b7+–

Line