Mating exercises

[Matthies]

M24: 6r1/1q2kp2/n3p3/4P3/2QP4/2P2PB1/1p5P/1R5K b - - 1 34
M16: 3b4/8/3p4/2kPp3/4P2p/6pB/pK6/8 b - - 1 66
M15: 8/8/2R5/1p2qp1k/1P2r3/2PQ2P1/5K2/8 w - - 0 1
M13: 3R1rk1/8/5Qpp/2p5/2P1p1q1/P3P3/1P2PK2/8 b - - 0 1
M15: 8/k7/p7/3Qp2P/n1P5/3KP3/1q6/8 b - - 0 1
M18: 7k/7p/3P4/8/1P5K/3r4/P7/8 b - - 2 60

[Matthies]

setoption name Hash value 1024
position fen 8/6np/3N3k/6n1/p4N2/P2p1p1p/P2PbP1P/1K6 w - - 4 6 
debug pv b1c1 e2f1 c1d1 f1g2 d1e1 g2h1 e1f1 h1g2 f1g1 g2f1 g1f1 g5e6 d6f7
go depth 64

Fluctuates between correct M7, M11 and M15

20220321: Fixed

[Matthies]

ToDo:

1. Mate isn't resolved if mating line enters TB position.
   1r4rk/4Nq2/7K/8/8/6R1/b5Q1/6R1 w - - 0 1
2. Improve (disable?) pruning and reductions when aspiration window sees mate.