Bender

Bender Builds

For windows, you can find them here. You want the bender or bender-cuda10 branches.

Rand Root Mod

Rank Name                          Elo     +/-   Games   Score   Draws
   0 Komodo 12 TB 1                -53      64      40   42.5%   65.0%
   1 Bender Rand Root               89      89      20   62.5%   65.0%
   2 Bender No Rand Root            17      92      20   52.5%   65.0%

40 of 40 games finished.

Leela Ratio

===
GPU:                 GTX 1070
Stockfish threads:   1
Stockfish hash:      16
Stockfish depth:     27
Stockfish nps:       1473744
Leela threads:       2
Leela nodes:         200000
Leela nps:           5309
Leela Ratio:         3.152
Leelafish Ratio:     7.378
===

The random root mod, which picks a random root move 1/16th of the time, and a move randomly, but proportional to Q 3/16th of the time (all after 4000 nodes have been completed). I expected it to play worse, but yield better multipv results. It did slightly better, but the sample (20 games per setting against Komodo 12) is small.

Example MultiPV

With cpuct=5.0 but no random root on this position 3q4/5p1k/6p1/4N3/2Q1P2p/PR3PnP/3r2PK/8 b - - 6 81:

info depth 15 seldepth 32 time 27206 nodes 138015 score cp -25 hashfull 456 nps 5072 tbhits 0 multipv 1 pv d8e7 f3f4 d2d1 b3g3 h4g3 h2g3 h7g7 e5f3 e7a3 c4c7 a3e3 c7e5 g7g8 g3h2 d1f1 f4f5 g6f5 e5f5 f1f2 f5g4 g8f8 h3h4 f2c2 h4h5 c2c5
info depth 15 seldepth 32 time 27206 nodes 138015 score cp -65 hashfull 456 nps 5072 tbhits 0 multipv 2 pv d8f6 b3b7 f6e5 c4f7 h7h6 f7f8 h6g5 b7b5 g3f1 h2g1 d2g2 g1g2 e5b5 f3f4 g5h5 f8h8
info depth 15 seldepth 32 time 27206 nodes 138015 score cp -98 hashfull 456 nps 5072 tbhits 0 multipv 3 pv d2g2 h2g2 d8d2 g2g1 d2e1 g1g2 e1d2 g2g1 d2e1 g1g2 e1d2

With cpuct=5.0 and random root:

info depth 14 seldepth 32 time 30318 nodes 163469 score cp -24 hashfull 515 nps 5391 tbhits 0 multipv 1 pv d8e7 f3f4 d2d1 b3g3 h4g3 h2g3 h7g7 e5f3 e7a3 c4c7 a3e3 c7e5 g7g8 g3h2 d1f1 f4f5 f1f3 g2f3 e3f2 h2h1 f2f1 h1h2 f1f2 h2h1 f2f1 h1h2 f1f2
info depth 14 seldepth 32 time 30318 nodes 163469 score cp -74 hashfull 515 nps 5391 tbhits 0 multipv 2 pv d2g2 h2g2 d8d2 g2g1 d2e1 g1g2 e1d2 g2g1 d2e1 g1g2 e1d2
info depth 14 seldepth 32 time 30318 nodes 163469 score cp -270 hashfull 515 nps 5391 tbhits 0 multipv 3 pv d8f6 b3b7 f6e5 c4f7 h7h6 f7f8 h6g5 b7b5 g3f1 h2g1 e5b5 f3f4 g5h5 f8h8