Add KNNNK knowledge.
Speeds up finding mate in some positions.

8/8/3k4/8/8/3NKN2/3N4/8 w - - 0 1
with KNNNK:
info depth 20 seldepth 28 score mate 20 nodes 13138142 nps 3018874 time 4352 multipv 1 pv d2e4 d6e6 d3f4 e6f5 e4d6 f5f6 e3d4 f6e7 d6e4 e7d7 d4d5 d7c7 d5c5 c7d7
info nodes 13138142 time 4352

without:
info depth 20 seldepth 24 score cp 1034 nodes 13208939 nps 3029573 time 4360 multipv 1 pv d3f4 d6d7 d2e4 d7e8 e3d4 e8e7 f3e5 e7f8 d4d5 f8g7 d5e6 g7f8 f4g6 f8g8 e4d2 g8g7 e6e7 g7h6 e7f6

bench: 7972140