This is a tough problem. In at least one of the side variations that arises at move 8 for black, it is enough to reduce the position to a winning position according to the Nalimov Tablebase since I considered that line inhuman (the composer didn't discuss that line *at all* in the solution he offered). The denouement of the main line is understandable, and is 13 moves deep, and is quite amazing by itself.

Comments

No. 1-3

**Yancey_Ward**

Editor

1.Nb6+ Kd8 2.a8=Q Rxa8 3.Bh4+ Kc7 4.Nxa8+ Kb7 5.Be1 Ne4 6.Bg6 Nf6 7.Bh4 Nd5 8.Bf7 Nb4 9.Be1 Nc6 is the main line, and the most interesting one.

**Yancey_Ward**

Editor

Alena, the main line is 9.....Nc6. The main variation in your line is at 8....Nf4 instead of the mainline's 8....Nb4. 8....Nf4 is the inhuman line I mentioned above.

**Alena**

1.Nb6+ Kd8 2.a8=Q Rxa8 3.Bh4+ Kc7 4.Nxa8+ Kb7 5.Be1 Ne4 6.Bg6 Nf6 7.Bh4 Nd5 8.Bf7 Nb4 9.Be1 Nd3 10.Bd5+ Ka7 11.Bc3 Bb7 12.Nc7 Nf4 13.Nb5+ Ka6 14.Bxb7+ Kxb7 It's a winning position for white.