Checkmate overrides the 50 move rule about berserk

[jhonnold]

Thank you for reporting this bug - it's currently going through a regression test on OpenBench.

Here is the new analysis for that final position

❯ ./berserk                                                                                                       
position fen 8/8/2p5/3b1K1k/4p3/4PpR1/5P2/8 w - - 99 113
go depth 10
info string time -1 start 1649376034111 alloc 0 max 2147483647 depth 10 timeset 0 searchmoves 0
info depth 1 seldepth 0 multipv 1 score cp 222 nodes 6 nps 6000 hashfull 0 tbhits 0 time 0 pv f5e5
info depth 2 seldepth 1 multipv 1 score cp 265 nodes 13 nps 13000 hashfull 0 tbhits 0 time 1 pv f5e5 h5h6
info depth 3 seldepth 2 multipv 1 score cp 202 nodes 60 nps 60000 hashfull 0 tbhits 0 time 1 pv f5f4 h5h4 f4f5
info depth 4 seldepth 3 multipv 1 score mate 1 nodes 88 nps 88000 hashfull 0 tbhits 0 time 1 pv g3h3
info depth 5 seldepth 3 multipv 1 score mate 1 nodes 91 nps 91000 hashfull 0 tbhits 0 time 1 pv g3h3
info depth 6 seldepth 3 multipv 1 score mate 1 nodes 94 nps 94000 hashfull 0 tbhits 0 time 1 pv g3h3
info depth 7 seldepth 3 multipv 1 score mate 1 nodes 98 nps 98000 hashfull 0 tbhits 0 time 1 pv g3h3
info depth 8 seldepth 3 multipv 1 score mate 1 nodes 102 nps 102000 hashfull 0 tbhits 0 time 1 pv g3h3
info depth 9 seldepth 3 multipv 1 score mate 1 nodes 115 nps 115000 hashfull 0 tbhits 0 time 1 pv g3h3
info depth 10 seldepth 3 multipv 1 score mate 1 nodes 128 nps 128000 hashfull 0 tbhits 0 time 1 pv g3h3
bestmove g3h3