Mate pruning bug #519
Description
Searching a mate-in-1 position searches too high seldepth and too many nodes:
ucinewgame
position fen 5K2/8/2qk4/2nPp3/3r4/6B1/B7/3R4 w - e6
go depth 18
info depth 1 seldepth 7 score mate 1 time 0 hashfull 0 nodes 110 nps 0 tbhits 0 pv d5e6
info depth 2 seldepth 8 score mate 1 time 0 hashfull 0 nodes 203 nps 0 tbhits 0 pv d5e6
info depth 3 seldepth 9 score mate 1 time 1 hashfull 0 nodes 566 nps 566000 tbhits 0 pv d5e6
info depth 4 seldepth 10 score mate 1 time 12 hashfull 0 nodes 4816 nps 401333 tbhits 0 pv d5e6
info depth 5 seldepth 12 score mate 1 time 33 hashfull 0 nodes 16915 nps 512576 tbhits 0 pv d5e6
info depth 6 seldepth 12 score mate 1 time 79 hashfull 0 nodes 32451 nps 410772 tbhits 0 pv d5e6
info depth 7 seldepth 14 score mate 1 time 491 hashfull 5 nodes 153599 nps 312829 tbhits 0 pv d5e6
info depth 8 seldepth 14 score mate 1 time 809 hashfull 8 nodes 248394 nps 307038 tbhits 0 pv d5e6
info depth 9 seldepth 16 score mate 1 time 3937 hashfull 35 nodes 932435 nps 236839 tbhits 0 pv d5e6
info depth 10 seldepth 16 score mate 1 time 4186 hashfull 68 nodes 1208587 nps 288721 tbhits 0 pv d5e6