Rubi has problems solving extreme positions
Matthies opened this issue · 1 comments
Matthies commented
R6R/3Q4/1Q2Q3/4Q3/2QB3Q/Q4Q2/Np1Q4/1k1N1K2 w - - 3 4
Master:
position fen R6R/3Q4/1Q2Q3/4Q3/2QB3Q/Q4Q2/Np1Q4/1k1N1K2 w - - 3 4
go
info depth 1 seldepth 1 multipv 1 time 200 score mate 0 lowerbound nodes 360350 nps 1797120 tbhits 0 hashfull 0 pv f3b3
info depth 1 seldepth 1 multipv 1 time 400 score mate 0 lowerbound nodes 750216 nps 1872896 tbhits 0 hashfull 0 pv f3b3
info depth 1 seldepth 1 multipv 1 time 600 score mate 0 lowerbound nodes 1137829 nps 1895424 tbhits 0 hashfull 0 pv f3b3
info depth 1 seldepth 1 multipv 1 time 800 score mate 0 lowerbound nodes 1542821 nps 1927168 tbhits 0 hashfull 0 pv f3b3
info depth 1 seldepth 1 multipv 1 time 1000 score mate 0 lowerbound nodes 1928939 nps 1927168 tbhits 0 hashfull 0 pv f3b3
info depth 1 seldepth 1 multipv 1 time 1200 score mate 0 lowerbound nodes 2317095 nps 1929216 tbhits 0 hashfull 0 pv f3b3
1.7.3:
position fen R6R/3Q4/1Q2Q3/4Q3/2QB3Q/Q4Q2/Np1Q4/1k1N1K2 w - - 3 4
go
info depth 1 seldepth 2 multipv 1 time 3 score mate -82 nodes 183 nps 0 tbhits 0 hashfull 1 pv f3b3
info depth 2 seldepth 3 multipv 1 time 6 score mate 1 nodes 382 nps 0 tbhits 0 hashfull 1 pv a3b2
info depth 3 seldepth 3 multipv 1 time 6 score mate 1 nodes 563 nps 0 tbhits 0 hashfull 1 pv a3b2
...
info depth 27 seldepth 40 multipv 1 time 217 score mate 1 nodes 431497 nps 1984512 tbhits 0 hashfull 49 pv a3b2
info depth 28 seldepth 37 multipv 1 time 376 score mate -117 nodes 730397 nps 1938432 tbhits 0 hashfull 114 pv d2d3 b1a1 d3b1 a1b1 c4d3 b1a1 d3b1 a1b1 d1b2 b1c2 d4e3 c2b1 b2a4 b1c2 e3d4 c2d2 f1f2 d2c2 f2g2 c2d2 h4h2 d2c2 d7d6 c2d2 a8g8 d2c2 h8h6 c2d2 g8g7 d2c2 h6g6 c2d2 g7h7
info depth 29 seldepth 34 multipv 1 time 659 score mate -113 nodes 1317468 nps 1996800 tbhits 0 hashfull 185 pv d2d3 b1a1 d3b1 a1b1 c4d3 b1a1 d3b1 a1b1 d1b2 b1c2 d4e3 c2b1 b2a4 b1c2 e3d4 c2d2 f1f2 d2c2 f2g2 c2d2 h4h2 d2c2 d7d6 c2d2 a8g8 d2c2 h8h6 c2d2 g8g7 d2c2 h6g6 c2d2 g7h7
info depth 29 seldepth 36 multipv 1 time 919 score mate -110 nodes 1891274 nps 2056192 tbhits 0 hashfull 240 pv d2d3 b1a1 d3b1 a1b1 a3d3 b1a1 d3b1 a1b1 d1b2 b1a1 c4a6 a1b1 a6d3 b1a1 d3a3 a1b1 b2a4 b1c2 a8a6 c2d2 f1f2 d2c2 a6a8 c2d2 h4h2 d2c2 d7d6 c2d2 f2g2 d2c2 a8a6 c2d2 a6a5 d2c2 a5a8
Matthies commented
It seems to be an overflow problem in kingdanger evaluation. If I remove some of the white queens and use this position
R6R/3Q4/8/4Q3/3B3Q/5Q2/Np1Q4/1k1N1K2 w - - 3 4
Rubi finds mate in 1.