テスト結果を載せます
ここから２倍ぐらいになれば、MasterReversiの背中が見えてくるレベル・・・まだまだです
YBWCとかやらないとなぁ

Microsoft Windows 10
Intel(R) Core(TM) i5-6500 CPU @ 3.20GHz
キャッシュサイズ256MB

FFO#40 ( Exact:(a2:+38) 1.19sec node: 12.33[Mn] nps:10323[Knps] )
FFO#41 ( Exact:(h4: +0) 2.99sec node: 35.31[Mn] nps:11825[Knps] )
FFO#42 ( Exact:(g2: +6) 2.86sec node: 39.98[Mn] nps:13961[Knps] )
FFO#43 ( Exact:(G3:-12) 2.49sec node: 25.47[Mn] nps:10236[Knps] )
FFO#44 ( Exact:(D2:-14) 4.08sec node: 40.86[Mn] nps:10006[Knps] )

FFO#45 ( Exact:(b2: +6) 29.92sec node: 449.45[Mn] nps:15022[Knps] )
FFO#46 ( Exact:(b3: -8) 7.48sec node: 87.43[Mn] nps:11687[Knps] )
FFO#47 ( Exact:(G2: +4) 3.71sec node: 49.65[Mn] nps:12851[Knps] )
FFO#48 ( Exact:(F6:+28) 18.78sec node: 216.42[Mn] nps:11523[Knps] )
FFO#49 ( Exact:(e1:+16) 53.12sec node: 655.97[Mn] nps:12350[Knps] )
FFO#50 ( Exact:(d8:+10) 141.11sec node: 1.39[Gn] nps: 9873[Knps] )

FFO#51 ( Exact:(E2:+6) 39.81sec node: 509.68[Mn] nps:12804[Knps] )
FFO#52 ( Exact:(a3:+0) 54.33sec node: 725.60[Mn] nps:13355[Knps] )
FFO#53 ( Exact:(d8:-2) 774.22sec node: 10.74[Gn] nps:13873[Knps] )
FFO#54 ( Exact:(c7:-2) 965.65sec node: 14.37[Gn] nps:14973[Knps] )
FFO#55 ( Exact:(G6:+0) 7124.95sec node: 105.41[Gn] nps:14794[Knps] )

FFO#56 ( Exact:(H5:+2) 244.72sec node: 3.22[Gn] nps:13475[Knps] )
FFO#57 ( Exact:(a6:-10) 926.60sec node: 11.06[Gn] nps:13352[Knps] )
FFO#58 ( Exact:(g1:+4) 551.11sec node: 8.16[Gn] nps:14803[Knps] )
FFO#59 ( Exact:(g8:+64) 0.94sec node: 5.28[Mn] nps: 5626[Knps] )