Section B1 Min Win
1.Nd3 !
{For now, White should keep e5 under control.}
( 1.Nd1 ? Kf6 2.e7 Nf7+ 3.Kd7 Ne5+
( 3…f2 4.e8=N+ Ke5 ! 5.Nxf2 Kd4 6.Nd1 Ne5+ 7.Kc7 Nc4 8.Nd6 Na3
= )
4.Kd6 Nf7+ 5.Kd7 Ne5+ = )
( 1.e7 ? Nf7+ 2.Kd7 f2 = )
1…Kf6 2.e7 Nf7+ 3.Kd7 f2 ! 4.e8=N+ !
( 4.e8=Q ? f1=Q = )
( 4.Nxf2 ? Ne5+ 5.Kd6
( 5.Kd8 Nc6+ = )
5…Nf7+ 6.Kd7 Ne5+ = )
4…Kf5 5.Nxf2 Ne5+ 6.Kc7 !
( 6.Ke7 ? Kf4 7.Nd6 Ke3 8.Nde4 Nc4 = )
( 6.Kd6 ? Nc4+ 7.Kc5
( 7.Kd5 Ne3+ = )
7…Na3 !
( 7…Ne3 ? 8.c3 +- )
8.c3 Nb1 = )
6…Kf4
( 6…Nc4 7.Nd6+ Nxd6 8.Kxd6 +- )
( 6…Ke6 7.Nd6 +- )
7.Nd6 Ke3 8.Nde4 Kd4
( 8…Nc4 9.Kc6 Kd4 10.c3+ +- )
9.c3+ Kc4 10.Kd6 Nf7+
( 10…Nf3 11.Nd1 +- )
11.Ke6 Ng5+ ! 12.Kf5
( 12.Ke5 ? Nf3+ = )
12…Nf3 13.Nd1 ! Nd4+
( 13…Ng1 14.Ke5 ! +- )
14.Ke5 ! Ne2
( 14…Nf3+ 15.Kf4 +- )
( 14…Nc6+ 15.Kd6 +- )
15.Nb2+ !
{The knight finishes its roundtrip (b2-d3-f2-d1-b2) and returns to its
starting square, sacrificing itself exactly there for the decisive
tempi gain.}
( 15.Nd2+ ? Kc5 16.c4 Nd4 17.Nb2 Nc6+ 18.Ke4 Na5 = )
( 15.Nd6+ ? Kc5 = )
( 15.Ne3+ ? Kd3 = )
15…Kb3
( 15…Kb5 16.c4+ +- )
16.c4 !
( 16.Nd1 ? Nxc3 = )
16…Kxb2 17.c5 +-
{The pawn is unstoppable.}
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