Johhn Nunn continues with a list of possible lines with as last item11...Kg2!! This is the move I had missed when I first looked at the position. Black’s surprising triangulation, which in addition unpins the knight, leaves White without a good reply:

- 5 12. Kd5 Kg3 13. Kxc4 is perhaps the most surprising line. Black simply gives up his pawn in order to activate his pieces. Although White doesn’t appear too badly off, he cannot save the game and the tablebase shows that Black can now mate in 50 moves.

73 249:44 -4.21 1...Qh8 2.Kd5 Qg8+ 3.Kc5 Qc8+ 4.Kd5 Qc7 5.Ne5 Qa5+ 6.Ke4 Qa2 7.Ng4+ Ke1 8.Nf3+ Ke2 9.Nge5 Qb1+ 10.Kf4 Qb6 11.Kf5 Qb4 12.Ke6 Kf2 13.Kd5 Qb5+ 14.Ke4 Qb7+ (48.049.702.515) 3206

73 249:44 -4.21 1...Qh6 2.Kd5 Qa6 3.Kc5 Qc8+ 4.Kd5 Qc7 5.Ne5 Qa5+ 6.Ke4 Qa2 7.Ng4+ Ke1 8.Nf3+ Ke2 9.Nge5 Qb1+ 10.Kf4 Qb6 11.Kf5 Qb4 12.Ke6 Kf2 13.Kd5 Qb5+ 14.Ke4 Qb7+ (48.049.702.515) 3206

73 249:44 -4.21 1...Qh7+ 2.Kd5 Qc7 3.Ne5 Qa5+ 4.Ke4 Qa2 5.Ng4+ Ke1 6.Nf3+ Ke2 7.Nge5 Qb1+ 8.Kf4 Qb6 9.Kf5 Qb4 10.Ke6 Kf2 11.Kd5 Qb5+ 12.Ke4 Qb7+ 13.Kd4 Qb3 14.Ke4 Kf1 (48.049.702.515) 3206

73 249:44 -4.21 1...Qb1+ 2.Kd5 Qb4 3.Ne5 Qa5+ 4.Ke4 Qa2 5.Ng4+ Ke1 6.Nf3+ Ke2 7.Nge5 Qb1+ 8.Kf4 Qb6 9.Kf5 Qb4 10.Ke6 Kf2 11.Kd5 Qb5+ 12.Ke4 Qb7+ 13.Kd4 Qb3 14.Ke4 Kf1 (48.049.702.515) 3206

73 249:44 -4.21 1...Qa1 2.Kd5 Qa6 3.Kc5 Qc8+ 4.Kd5 Qc7 5.Ne5 Qa5+ 6.Ke4 Qa2 7.Ng4+ Ke1 8.Nf3+ Ke2 9.Nge5 Qb1+ 10.Kf4 Qb6 11.Kf5 Qb4 12.Ke6 Kf2 13.Kd5 Qb5+ 14.Ke4 Qb7+ (48.049.702.515) 3206

73 249:44 -4.21 1...Qg2 2.Kd5 Qg8+ 3.Kc5 Qc8+ 4.Kd5 Qc7 5.Ne5 Qa5+ 6.Ke4 Qa2 7.Ng4+ Ke1 8.Nf3+ Ke2 9.Nge5 Qb1+ 10.Kf4 Qb6 11.Kf5 Qb4 12.Ke6 Kf2 13.Kd5 Qb5+ 14.Ke4 Qb7+ (48.049.702.515) 3206

73 249:44 -4.21 1...Qh5 2.Ne5 Qh1+ 3.Nef3 Qg2 4.Kd5 Qg8+ 5.Kc5 Qc8+ 6.Kd5 Qc7 7.Ne5 Qa5+ 8.Ke4 Qa2 9.Ng4+ Ke1 10.Nf3+ Ke2 11.Nge5 Qb1+ 12.Kf4 Qb6 13.Kf5 Qb4 14.Ke6 Kf2 (48.049.702.515) 3206

73 249:44 -3.99 1...Kg3 2.Kd5 Kf4 3.Kxc4 Qg2 4.Kc3 Qf1 5.Kb4 Qd3 6.Kc5 Qa3+ 7.Kb5 Ke4 8.Kc4 Qa4+ 9.Kc5 Qa5+ 10.Kc4 Qd5+ 11.Kc3 Qh5 12.Kc2 Qg4 13.Kc3 Qc8+ 14.Kb4 Qa6 (48.049.702.515) 3206

72 249:44 -3.70

**1...Kg2 2.Kd5 Kg3 3.Kxc4 Qf1+ 4.Kd5 Kf4 5.Ne5 Qg2+ 6.Ndf3 Qg8+**7.Kd6 Qd8+ 8.Kc5 Ke4 9.d3+ Kf4 10.Kc6 Qa5 11.Kd6 Qb6+ 12.Kd5 Qc7 13.Kd4 Qd6+ 14.Kc4 Qe6+ (48.049.702.515) 3206

72 249:44 -3.26 1...Qd1 2.Kd5 Qa4 3.Kc5 Qa2 4.Ne5 Qa5+ 5.Nb5 Qxd2 6.Nxc4 Qg5+ 7.Kc6 Ke2 8.Nc7 Kd3 9.Nb6 Qf6+ 10.Kc5 Qd4+ 11.Kc6 Ke4 12.Ncd5 Kf5 13.Nc7 Qe4+ 14.Kd6 Qd3+ (48.049.702.515) 3206