Fairy-Stockfish Version
Fairy-Stockfish 240123 LB by Fabian Fichter
Steps to reproduce
fen 3aka3/4n4/9/9/9/9/9/7C1/7r1/3AK4 w
go depth 30
info depth 30 seldepth 10 multipv 1 score mate 5 nodes 13090 nps 335641 tbhits 0 time 39 pv h2c2 h1c1 c2g2 c1g1 g2c2 g1g0 e0e1 g0d0 c2c9
fen 5R3/4k4/9/4r4/9/9/5p3/5A3/5K3/9 b
go depth 30
info depth 30 seldepth 38 multipv 1 score mate 20 nodes 1126966 nps 749312 hashfull 140 tbhits 0 time 1504 pv f3g3 f9g9 g3f3 g9g8 e8e9 g8g2 e6e2 g2h2 e9f9 h2h9 f9f8 h9h8 f8f9 f2e1 f9e9 h8h9 e9e8 f1f0 e2e1 h9h8 e8e9 h8f8 e1e0 f0f1 e0e3 f8f4 f3g3 f4f9 e9e8 f9f8 e8e9 f1f0 e3f3 f8f3 g3f3 f0f1 e9e8 f1f0
Expected behavior
judge the position as draw, see Three fold Pikafish and ChessDB.
fen 3aka3/4n4/9/9/9/9/9/7C1/7r1/3AK4 w
setoption name Repetition Fold value ThreeFold
go depth 30
info depth 30 seldepth 24 multipv 1 score cp 0 nodes 59057 nps 1256531 hashfull 8 tbhits 0 time 47 pv h2a2 h1h0 e0e1 h0h1 e1e0 h1c1 a2g2 c1g1 g2c2 g1g0 e0e1 g0g1 e1e0 g1c1 c2g2 c1g1 g2b2 g1c1 b2h2 c1h1 h2b2 h1c1 b2g2
https://www.chessdb.cn/query/?5R3/4k4/9/4r4/9/9/5p3/5A3/5K3/9_b fen 5R3/4k4/9/4r4/9/9/5p3/5A3/5K3/9 b
setoption name Repetition Fold value ThreeFold
go depth 30
info depth 30 seldepth 36 multipv 1 score cp 15 nodes 577738 nps 1569940 hashfull 76 tbhits 0 time 368 pv e6e3 f9f6 f3g3 f6g6 e3c3 g6e6 e8f8 e6f6 f8e8 f6e6 e8f8 e6g6 c3f3 f1e1 f3e3 e1f1 g3f3 g6f6 f8e8 f6f5 f3g3 f5g5 g3h3 g5h5 h3g3 h5g5 g3h3 g5h5 e3f3 h5h8 e8e9 h8h9 e9e8 h9h8 e8e9 h8h9 e9e8
Possible fix
use 3 fold in search also.
version 4-10 use ThreeFold for Asian Rule
