Section B1 – Min Win
1.Rb2!
( (It is not possible to win inmediately with 1.Rb1? Rg2! 2.Kxg2 Re2 3.Kf3 Rd2 4.Rf1 Kb5 5.Kxf4 Kc6 6.Kf5 Kd7! =, quiet First defensive line. Therefore, White’s first move eliminates it) )
1…Ka3
(Black forces the white rook to leave the second rank. However, after Ra3, the black king cannot reach the saving square b5 with the further route c6-d7)
2.Rb1!
( ( 2.Rb8? Rg2! 3.Kxg2 Re2 4.Kf3
( 4.Rf8 Kb4! 5.Rxf4+ Kc5 =, quiet )
4…Rc2! 5.Rf8 Kb4 6.Rxf4+ Kc5! =, quiet Second defensive line) )
2…Rg2! 3.Kxg2 Re2 4.Kf3 Rd2 5.Rf1!!
( 5.Rb5!? Rc2! 6.Rf5 Kb4! 7.Rxf4+ Kc5 =, quiet )
( 5.Re1? Kb4! 6.Re2 Rd8! =, quiet )
5…Rd4
( 5…Kb4 6.Kxf4 +- )
6.Re1!
( (6.Tb1 Rd2-Repetition of position; 6.Kg4? Kb4! 7.Rc1 Kb5! =, quiet )
( 6.Rg1? Kb4! =, quiet ) )
6…Kb4 7.Re4!
The second defensive line is overcome by exchanging rooks!
( 7.Re5? Rd2! 8.Re2 Rd8! =, quiet )
7…Kc5 8.Rxd4! Kxd4 9.Kxf4 +- *